message stringlengths 2 433k | message_type stringclasses 2
values | message_id int64 0 1 | conversation_id int64 113 108k | cluster float64 12 12 | __index_level_0__ int64 226 217k |
|---|---|---|---|---|---|
Provide a correct Python 3 solution for this coding contest problem.
Write a program which reads a sequence of integers $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and swap specified elements by a list of the following operation:
* swapRange($b, e, t$): For each integer $k$ ($0 \leq k < (e - b)$, swap element $(b + k)$ and element $(t + k)$.
Constraints
* $1 \leq n \leq 1,000$
* $-1,000,000,000 \leq a_i \leq 1,000,000,000$
* $1 \leq q \leq 1,000$
* $0 \leq b_i < e_i \leq n$
* $0 \leq t_i < t_i + (e_i - b_i) \leq n$
* Given swap ranges do not overlap each other
Input
The input is given in the following format.
$n$
$a_0 \; a_1 \; ...,\; a_{n-1}$
$q$
$b_1 \; e_1 \; t_1$
$b_2 \; e_2 \; t_2$
:
$b_{q} \; e_{q} \; t_{q}$
In the first line, $n$ (the number of elements in $A$) is given. In the second line, $a_i$ (each element in $A$) are given. In the third line, the number of queries $q$ is given and each query is given by three integers $b_i \; e_i \; t_i$ in the following $q$ lines.
Output
Print all elements of $A$ in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.
Example
Input
11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7
Output
1 8 9 10 5 6 7 2 3 4 11 | instruction | 0 | 57,971 | 12 | 115,942 |
"Correct Solution:
```
input()
nums = list(map(int, input().split(' ')))
n = int(input())
for _ in range(n):
f, m, l = list(map(int, input().split(' ')))
m = m-f
if f > l:
f, l = l, f
sb_1 = list(nums[f:f+m])
sb_2 = list(nums[l:l+m])
nums = nums[:f] + sb_2 + nums[f+m:l] + sb_1 + nums[l+m:]
print(' '.join(map(str, nums)))
``` | output | 1 | 57,971 | 12 | 115,943 |
Provide a correct Python 3 solution for this coding contest problem.
Write a program which reads a sequence of integers $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and swap specified elements by a list of the following operation:
* swapRange($b, e, t$): For each integer $k$ ($0 \leq k < (e - b)$, swap element $(b + k)$ and element $(t + k)$.
Constraints
* $1 \leq n \leq 1,000$
* $-1,000,000,000 \leq a_i \leq 1,000,000,000$
* $1 \leq q \leq 1,000$
* $0 \leq b_i < e_i \leq n$
* $0 \leq t_i < t_i + (e_i - b_i) \leq n$
* Given swap ranges do not overlap each other
Input
The input is given in the following format.
$n$
$a_0 \; a_1 \; ...,\; a_{n-1}$
$q$
$b_1 \; e_1 \; t_1$
$b_2 \; e_2 \; t_2$
:
$b_{q} \; e_{q} \; t_{q}$
In the first line, $n$ (the number of elements in $A$) is given. In the second line, $a_i$ (each element in $A$) are given. In the third line, the number of queries $q$ is given and each query is given by three integers $b_i \; e_i \; t_i$ in the following $q$ lines.
Output
Print all elements of $A$ in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.
Example
Input
11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7
Output
1 8 9 10 5 6 7 2 3 4 11 | instruction | 0 | 57,972 | 12 | 115,944 |
"Correct Solution:
```
N = int(input())
A = list(map(int,input().split()))
Q = int(input())
for _ in range(Q):
b,e,t = map(int,input().split())
for k in range(e-b):
A[b+k],A[t+k] = A[t+k],A[b+k]
print(*A)
``` | output | 1 | 57,972 | 12 | 115,945 |
Provide a correct Python 3 solution for this coding contest problem.
Write a program which reads a sequence of integers $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and swap specified elements by a list of the following operation:
* swapRange($b, e, t$): For each integer $k$ ($0 \leq k < (e - b)$, swap element $(b + k)$ and element $(t + k)$.
Constraints
* $1 \leq n \leq 1,000$
* $-1,000,000,000 \leq a_i \leq 1,000,000,000$
* $1 \leq q \leq 1,000$
* $0 \leq b_i < e_i \leq n$
* $0 \leq t_i < t_i + (e_i - b_i) \leq n$
* Given swap ranges do not overlap each other
Input
The input is given in the following format.
$n$
$a_0 \; a_1 \; ...,\; a_{n-1}$
$q$
$b_1 \; e_1 \; t_1$
$b_2 \; e_2 \; t_2$
:
$b_{q} \; e_{q} \; t_{q}$
In the first line, $n$ (the number of elements in $A$) is given. In the second line, $a_i$ (each element in $A$) are given. In the third line, the number of queries $q$ is given and each query is given by three integers $b_i \; e_i \; t_i$ in the following $q$ lines.
Output
Print all elements of $A$ in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.
Example
Input
11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7
Output
1 8 9 10 5 6 7 2 3 4 11 | instruction | 0 | 57,973 | 12 | 115,946 |
"Correct Solution:
```
n = int(input())
L = [int(x) for x in input().split()]
n = int(input())
for _ in range(n):
b, e, t = [int(x) for x in input().split()]
L[b:e], L[t:t+e-b] = L[t:t+e-b], L[b:e]
print(*L)
``` | output | 1 | 57,973 | 12 | 115,947 |
Provide a correct Python 3 solution for this coding contest problem.
Write a program which reads a sequence of integers $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and swap specified elements by a list of the following operation:
* swapRange($b, e, t$): For each integer $k$ ($0 \leq k < (e - b)$, swap element $(b + k)$ and element $(t + k)$.
Constraints
* $1 \leq n \leq 1,000$
* $-1,000,000,000 \leq a_i \leq 1,000,000,000$
* $1 \leq q \leq 1,000$
* $0 \leq b_i < e_i \leq n$
* $0 \leq t_i < t_i + (e_i - b_i) \leq n$
* Given swap ranges do not overlap each other
Input
The input is given in the following format.
$n$
$a_0 \; a_1 \; ...,\; a_{n-1}$
$q$
$b_1 \; e_1 \; t_1$
$b_2 \; e_2 \; t_2$
:
$b_{q} \; e_{q} \; t_{q}$
In the first line, $n$ (the number of elements in $A$) is given. In the second line, $a_i$ (each element in $A$) are given. In the third line, the number of queries $q$ is given and each query is given by three integers $b_i \; e_i \; t_i$ in the following $q$ lines.
Output
Print all elements of $A$ in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.
Example
Input
11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7
Output
1 8 9 10 5 6 7 2 3 4 11 | instruction | 0 | 57,974 | 12 | 115,948 |
"Correct Solution:
```
def main():
n = int(input())
A = list(map(int,input().split()))
m = int(input())
for _ in range(m):
a,b,c = map(int,input().split())
A[a:b],A[c:c+(b-a)] = A[c:c+(b-a)],A[a:b]
print (' '.join(map(str,A)))
if __name__ == '__main__':
main()
``` | output | 1 | 57,974 | 12 | 115,949 |
Provide a correct Python 3 solution for this coding contest problem.
Write a program which reads a sequence of integers $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and swap specified elements by a list of the following operation:
* swapRange($b, e, t$): For each integer $k$ ($0 \leq k < (e - b)$, swap element $(b + k)$ and element $(t + k)$.
Constraints
* $1 \leq n \leq 1,000$
* $-1,000,000,000 \leq a_i \leq 1,000,000,000$
* $1 \leq q \leq 1,000$
* $0 \leq b_i < e_i \leq n$
* $0 \leq t_i < t_i + (e_i - b_i) \leq n$
* Given swap ranges do not overlap each other
Input
The input is given in the following format.
$n$
$a_0 \; a_1 \; ...,\; a_{n-1}$
$q$
$b_1 \; e_1 \; t_1$
$b_2 \; e_2 \; t_2$
:
$b_{q} \; e_{q} \; t_{q}$
In the first line, $n$ (the number of elements in $A$) is given. In the second line, $a_i$ (each element in $A$) are given. In the third line, the number of queries $q$ is given and each query is given by three integers $b_i \; e_i \; t_i$ in the following $q$ lines.
Output
Print all elements of $A$ in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.
Example
Input
11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7
Output
1 8 9 10 5 6 7 2 3 4 11 | instruction | 0 | 57,975 | 12 | 115,950 |
"Correct Solution:
```
n = input()
A = list(input().split())
for i in range(int(input())):
b, e, t = map(int, input().split())
for k in range(e - b):
A[b+k], A[t+k] = A[t+k], A[b+k]
print(*A, sep=' ')
``` | output | 1 | 57,975 | 12 | 115,951 |
Provide a correct Python 3 solution for this coding contest problem.
Write a program which reads a sequence of integers $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and swap specified elements by a list of the following operation:
* swapRange($b, e, t$): For each integer $k$ ($0 \leq k < (e - b)$, swap element $(b + k)$ and element $(t + k)$.
Constraints
* $1 \leq n \leq 1,000$
* $-1,000,000,000 \leq a_i \leq 1,000,000,000$
* $1 \leq q \leq 1,000$
* $0 \leq b_i < e_i \leq n$
* $0 \leq t_i < t_i + (e_i - b_i) \leq n$
* Given swap ranges do not overlap each other
Input
The input is given in the following format.
$n$
$a_0 \; a_1 \; ...,\; a_{n-1}$
$q$
$b_1 \; e_1 \; t_1$
$b_2 \; e_2 \; t_2$
:
$b_{q} \; e_{q} \; t_{q}$
In the first line, $n$ (the number of elements in $A$) is given. In the second line, $a_i$ (each element in $A$) are given. In the third line, the number of queries $q$ is given and each query is given by three integers $b_i \; e_i \; t_i$ in the following $q$ lines.
Output
Print all elements of $A$ in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.
Example
Input
11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7
Output
1 8 9 10 5 6 7 2 3 4 11 | instruction | 0 | 57,976 | 12 | 115,952 |
"Correct Solution:
```
n = int(input())
arr = input().split()
nq = int(input())
for i in range(nq):
begin, end, tgt = map(int, input().split())
length = end - begin
if begin < tgt:
arr = arr[:begin] + arr[tgt:tgt+length] + arr[end:tgt] + arr[begin:end] + arr[tgt+length:]
else:
arr = arr[:tgt] + arr[begin:end] + arr[tgt+length:begin] + arr[tgt:tgt+length] + arr[end:]
print(*arr)
``` | output | 1 | 57,976 | 12 | 115,953 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Write a program which reads a sequence of integers $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and swap specified elements by a list of the following operation:
* swapRange($b, e, t$): For each integer $k$ ($0 \leq k < (e - b)$, swap element $(b + k)$ and element $(t + k)$.
Constraints
* $1 \leq n \leq 1,000$
* $-1,000,000,000 \leq a_i \leq 1,000,000,000$
* $1 \leq q \leq 1,000$
* $0 \leq b_i < e_i \leq n$
* $0 \leq t_i < t_i + (e_i - b_i) \leq n$
* Given swap ranges do not overlap each other
Input
The input is given in the following format.
$n$
$a_0 \; a_1 \; ...,\; a_{n-1}$
$q$
$b_1 \; e_1 \; t_1$
$b_2 \; e_2 \; t_2$
:
$b_{q} \; e_{q} \; t_{q}$
In the first line, $n$ (the number of elements in $A$) is given. In the second line, $a_i$ (each element in $A$) are given. In the third line, the number of queries $q$ is given and each query is given by three integers $b_i \; e_i \; t_i$ in the following $q$ lines.
Output
Print all elements of $A$ in a line after performing the given operations. Put a single space character between adjacency elements and a newline at the end of the last element.
Example
Input
11
1 2 3 4 5 6 7 8 9 10 11
1
1 4 7
Output
1 8 9 10 5 6 7 2 3 4 11
Submitted Solution:
```
# coding=utf-8
def partial_swap(origin, begin, end, begin2):
list1 = origin[:begin]
list2 = origin[begin:end]
list3 = origin[end:begin2]
list4 = origin[begin2:begin2+end-begin]
list5 = origin[begin2+end-begin:]
return list1 + list4 + list3 + list2 + list5
if __name__ == '__main__':
N = int(input())
A = list(map(int, input().split()))
Q = int(input())
for i in range(Q):
b, e, t = map(int, input().split())
A = partial_swap(A, b, e, t)
print(' '.join(map(str, A)))
``` | instruction | 0 | 57,981 | 12 | 115,962 |
No | output | 1 | 57,981 | 12 | 115,963 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,008 | 12 | 116,016 |
Tags: implementation
Correct Solution:
```
n=int(input())
l=input().split()
if l[0]!='0':
print(1)
exit()
m=0
for i in range(1,n):
if int(l[i])>m+1:
print(i+1)
exit()
if int(l[i])>=m+1:
m=int(l[i])
print(-1)
``` | output | 1 | 58,008 | 12 | 116,017 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,009 | 12 | 116,018 |
Tags: implementation
Correct Solution:
```
step = int(input())
arrayVal = [int(item) for item in input().split(" ")]
maxMex = 0
for i,item in enumerate(arrayVal):
if arrayVal[0] != 0:
print(1)
break
elif item > maxMex+1:
print(i+1)
break
elif i == step-1:
print(-1)
maxMex = max(item,maxMex)
``` | output | 1 | 58,009 | 12 | 116,019 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,010 | 12 | 116,020 |
Tags: implementation
Correct Solution:
```
n = int(input())
a = list(map(int, input().split()))
m = -1
for i, elem in enumerate(a):
if elem - m > 1 or elem < 0:
print(i + 1)
break
if elem > m:
m = elem
else:
print(-1)
``` | output | 1 | 58,010 | 12 | 116,021 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,011 | 12 | 116,022 |
Tags: implementation
Correct Solution:
```
input()
m = -1
for i, a in enumerate(map(int, input().split())):
if a > m + 1:
print(i+1)
break
else:
m = max(m, a)
else:
print(-1)
``` | output | 1 | 58,011 | 12 | 116,023 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,012 | 12 | 116,024 |
Tags: implementation
Correct Solution:
```
n=int(input())
la=list(map(int,input().rstrip().split()))
i=0
p=[]
c=0
for x in range(n):
if la[x]<i:
i-=1
elif la[x]==i:
pass
else:
index=x+1
c=1
break
i+=1
if c==1:
print(index)
else:
print("-1")
``` | output | 1 | 58,012 | 12 | 116,025 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,013 | 12 | 116,026 |
Tags: implementation
Correct Solution:
```
from sys import stdin, stdout
import cProfile, math
from collections import Counter
from bisect import bisect_left
printHeap = str()
test = False
memory_constrained = False
def display(string_to_print):
stdout.write(str(string_to_print) + "\n")
def test_print(output):
if test:
stdout.write(str(output) + "\n")
def display_list(list1, sep=" "):
stdout.write(sep.join(map(str, list1)) + "\n")
def get_int():
return int(stdin.readline().strip())
def get_tuple():
return map(int, stdin.readline().split())
def get_list():
return list(map(int, stdin.readline().split()))
memory = dict()
def clear_cache():
global memory
memory = dict()
def cached_fn(fn, *args):
global memory
if args in memory:
return memory[args]
else:
result = fn(*args)
memory[args] = result
return result
# ----------------------------------------------------------------------------------- MAIN PROGRAM
def main():
n = get_int()
li = get_list()
max = li[0]
if max!=0:
print (1)
return
j = 1
for i in li:
if i<=max:
j+=1
continue
elif i==max+1:
max = i
else:
print(j)
return
j+=1
print(-1)
# --------------------------------------------------------------------------------------------- END
cProfile.run('main()') if test else main()
``` | output | 1 | 58,013 | 12 | 116,027 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,014 | 12 | 116,028 |
Tags: implementation
Correct Solution:
```
input()
a = tuple(map(int, input().split()))
top = -1
for i, x in enumerate(a, start=1):
if x - top <= 1:
top = max(x, top)
else:
print(i)
exit()
print(-1)
``` | output | 1 | 58,014 | 12 | 116,029 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong. | instruction | 0 | 58,015 | 12 | 116,030 |
Tags: implementation
Correct Solution:
```
n=int(input())
a=list(map(int,input().split()))
maxx=0
flag=0
for i in range(n):
if i==0:
if a[i]!=0:
print(i+1)
flag=1
break
elif a[i]>maxx+1:
print(i+1)
flag=1
break
elif a[i]==maxx+1:
maxx=a[i]
if flag==0:
print(-1)
``` | output | 1 | 58,015 | 12 | 116,031 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
# import atexit
# import io
# import sys
#
# _INPUT_LINES = sys.stdin.read().splitlines()
# input = iter(_INPUT_LINES).__next__
# _OUTPUT_BUFFER = io.StringIO()
# sys.stdout = _OUTPUT_BUFFER
#
#
# @atexit.register
# def write():
# sys.__stdout__.write(_OUTPUT_BUFFER.getvalue())
n = int(input())
arr = list(map(int, input().split()))
mx = -1
for idx, v in enumerate(arr):
if mx + 1 == v:
mx = v
elif v > mx + 1:
print(idx + 1)
exit(0)
print(-1)
``` | instruction | 0 | 58,016 | 12 | 116,032 |
Yes | output | 1 | 58,016 | 12 | 116,033 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
n=int(input())
a=list(map(int,input().strip().split()))
k,ans=-1,-1
for i in range(n):
if a[i]>k+1:
ans=i+1
break
k=max(a[i],k)
print(ans)
``` | instruction | 0 | 58,017 | 12 | 116,034 |
Yes | output | 1 | 58,017 | 12 | 116,035 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
n = int(input())
a = [int(t) for t in input().split(' ')]
maxn = 0
for i in range(len(a)):
if a[i] <= maxn:
maxn = max(maxn, a[i] + 1)
else:
print(i+1)
break
else: print(-1)
``` | instruction | 0 | 58,018 | 12 | 116,036 |
Yes | output | 1 | 58,018 | 12 | 116,037 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
n = int(input())
A = list(map(int, input().split()))
q = -2
kek = {ww - 1: 0 for ww in set(A)}
for elemq in range(n):
elem = A[elemq]
kek[elem] = 1
if not kek[elem - 1] and elem != 0:
q = elemq
break
print(q + 1)
``` | instruction | 0 | 58,019 | 12 | 116,038 |
Yes | output | 1 | 58,019 | 12 | 116,039 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
n = int(input())
a = list(map(int, input().split()))
stop = True
if a[0]!=0:
print(1)
stop=False
else:
for i in range(1,n):
if not a[i]-1 in a:
print(i+1)
stop = False
break
if stop: print(-1)
``` | instruction | 0 | 58,020 | 12 | 116,040 |
No | output | 1 | 58,020 | 12 | 116,041 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
import sys
import math
n=int(input())
lisa=[int(x) for x in input().strip().split()]
max,flag=0,True
for i in range(n):
if(i==0 and lisa[i]!=0):
print("1")
flag=False
break
if(lisa[i]<=max):
continue
if(lisa[i]==max+1):
max=lisa[i]+1
continue
elif(i!=0):
print(i+1)
flag=False
if(flag==True):print("-1")
``` | instruction | 0 | 58,021 | 12 | 116,042 |
No | output | 1 | 58,021 | 12 | 116,043 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
n=int(input())
li=list(map(int,input().split()))
if(n==1 and li[0]==0):
print(-1)
else:
c=0
di=[0 for i in range(n)]
if(li[0]!=0):
print(1)
else:
for i in range(1,n):
if(li[i]-li[i-1]!=1):
if(li[i]>li[i-1]):
li3=li[0:i]
if(li[i]-1 not in li3):
print(i+1)
c=1
break
if(c==0):
print(-1)
``` | instruction | 0 | 58,022 | 12 | 116,044 |
No | output | 1 | 58,022 | 12 | 116,045 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Initially Ildar has an empty array. He performs n steps. On each step he takes a subset of integers already added to the array and appends the mex of this subset to the array.
The mex of an multiset of integers is the smallest non-negative integer not presented in the multiset. For example, the mex of the multiset [0, 2, 3] is 1, while the mex of the multiset [1, 2, 1] is 0.
More formally, on the step m, when Ildar already has an array a_1, a_2, …, a_{m-1}, he chooses some subset of indices 1 ≤ i_1 < i_2 < … < i_k < m (possibly, empty), where 0 ≤ k < m, and appends the mex(a_{i_1}, a_{i_2}, … a_{i_k}) to the end of the array.
After performing all the steps Ildar thinks that he might have made a mistake somewhere. He asks you to determine for a given array a_1, a_2, …, a_n the minimum step t such that he has definitely made a mistake on at least one of the steps 1, 2, …, t, or determine that he could have obtained this array without mistakes.
Input
The first line contains a single integer n (1 ≤ n ≤ 100 000) — the number of steps Ildar made.
The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the array Ildar obtained.
Output
If Ildar could have chosen the subsets on each step in such a way that the resulting array is a_1, a_2, …, a_n, print -1.
Otherwise print a single integer t — the smallest index of a step such that a mistake was made on at least one step among steps 1, 2, …, t.
Examples
Input
4
0 1 2 1
Output
-1
Input
3
1 0 1
Output
1
Input
4
0 1 2 239
Output
4
Note
In the first example it is possible that Ildar made no mistakes. Here is the process he could have followed.
* 1-st step. The initial array is empty. He can choose an empty subset and obtain 0, because the mex of an empty set is 0. Appending this value to the end he gets the array [0].
* 2-nd step. The current array is [0]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1].
* 3-rd step. The current array is [0,1]. He can choose a subset [0,1] and obtain an integer 2, because mex(0,1) = 2. Appending this value to the end he gets the array [0,1,2].
* 4-th step. The current array is [0,1,2]. He can choose a subset [0] and obtain an integer 1, because mex(0) = 1. Appending this value to the end he gets the array [0,1,2,1].
Thus, he can get the array without mistakes, so the answer is -1.
In the second example he has definitely made a mistake on the very first step, because he could not have obtained anything different from 0.
In the third example he could have obtained [0, 1, 2] without mistakes, but 239 is definitely wrong.
Submitted Solution:
```
n = int(input())
m = 0
a = list(map(int,input().split()))
for i in range(n):
if a[i] > m+1:
print(i+1)
exit()
m = max(m,a[i])
print(-1)
``` | instruction | 0 | 58,023 | 12 | 116,046 |
No | output | 1 | 58,023 | 12 | 116,047 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,088 | 12 | 116,176 |
Tags: greedy, math, sortings
Correct Solution:
```
n=int(input())
a=list(map(int,input().split()))
b=list(map(int,input().split()))
for i in range(n):
a[i]*=(i+1)*(n-i)
a.sort()
b.sort(reverse=True)
print(sum(a[i]*b[i] for i in range(n))%998244353)
``` | output | 1 | 58,088 | 12 | 116,177 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,089 | 12 | 116,178 |
Tags: greedy, math, sortings
Correct Solution:
```
import sys
input = sys.stdin.readline
rInt = lambda: int(input())
mInt = lambda: map(int, input().split())
rLis = lambda: list(map(int, input().split()))
n = rInt()
a, b = rLis(), rLis()
for i in range(n):
a[i] *= (i + 1) * (n - i)
a.sort()
b.sort(reverse = True)
out = 0
for i in range(n):
out += a[i] * b[i]
out %= 998244353
print(out)
``` | output | 1 | 58,089 | 12 | 116,179 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,090 | 12 | 116,180 |
Tags: greedy, math, sortings
Correct Solution:
```
n = int(input())
a = list(map(int,input().split(' ')))
at = []
for i in range(len(a)):
at.append(a[i]*(i+1)*(n-i))
at.sort(reverse=True)
b = list(map(int,input().split(' ')))
b.sort()
print(sum([a*b for a,b in zip(at,b)]) % 998244353)
``` | output | 1 | 58,090 | 12 | 116,181 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,091 | 12 | 116,182 |
Tags: greedy, math, sortings
Correct Solution:
```
from sys import stdin
def main():
n = int(stdin.readline())
a = list(map(int, stdin.readline().split()))
b = list(map(int, stdin.readline().split()))
# a.sort(reverse=True)
b.sort(reverse=True)
ans = 0
mod = 998244353
h = []
for i in range(1, n + 1):
h.append(i * (n - i + 1))
for i in range(n):
h[i] = h[i] * a[i]
h.sort()
for i in range(n):
ans += (b[i] * h[i]) % mod
print(ans % mod)
if __name__ == "__main__":
main()
``` | output | 1 | 58,091 | 12 | 116,183 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,092 | 12 | 116,184 |
Tags: greedy, math, sortings
Correct Solution:
```
import math
import bisect
import heapq
from collections import defaultdict
def egcd(a, b):
if a == 0:
return (b, 0, 1)
else:
g, x, y = egcd(b % a, a)
return (g, y - (b // a) * x, x)
def mulinv(b, n):
g, x, _ = egcd(b, n)
if g == 1:
return x % n
def isprime(n):
for d in range(2, int(math.sqrt(n))+1):
if n % d == 0:
return False
return True
def argsort(ls):
return sorted(range(len(ls)), key=ls.__getitem__)
def f(p=0):
if p == 1:
return map(int, input().split())
elif p == 2:
return list(map(int, input().split()))
elif p == 3:
return list(input())
else:
return int(input())
n = f()
a = f(2)
b = sorted(f(2))[::-1]
cl = []
for i in range(n):
cl.append(a[i]*(i+1)*(n-i))
ind = argsort(cl)
dl = [0]*n
for i in range(n):
dl[ind[i]]=i
const = 998244353
res = 0
for i in range(n):
res+=b[dl[i]]*cl[i]
if res>const:
res = res%const
print(res)
``` | output | 1 | 58,092 | 12 | 116,185 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,093 | 12 | 116,186 |
Tags: greedy, math, sortings
Correct Solution:
```
n = int(input())
a = [int(i) for i in input().split()]
b = [int(i) for i in input().split()]
c = []
sum1 = 0
#for i in range(n):
#sum1 += a[i] * b[i]
#for i in range(n):
#c.append(a[i] * (i+1) * (n - i))
#sum1 +=(c[i] * b[i])
for i in range(n):
a[i] = a[i] * (i+1) * (n - i)
a.sort()
b.sort(reverse=True)
for j in range(n):
sum1 += a[j] * b[j]
print(sum1%998244353)
``` | output | 1 | 58,093 | 12 | 116,187 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,094 | 12 | 116,188 |
Tags: greedy, math, sortings
Correct Solution:
```
import sys
from collections import defaultdict
n=int(sys.stdin.readline())
a=list(map(int,sys.stdin.readline().split()))
b=list(map(int,sys.stdin.readline().split()))
mod=998244353
c=[]
for i in range(n):
left,right=i+1,n-i
c.append([a[i]*left*right,i])
c.sort()
b.sort()
b.reverse()
newb=[0 for _ in range(n)]
for i in range(n):
newb[c[i][1]]=b[i]
ans=0
#print(a,'a')
#print(newb,'newb')
for i in range(n):
left,right=i+1,(n-i)
add=(left*right*a[i]*newb[i])%mod
ans+=add
ans=ans%mod
print(ans%mod)
``` | output | 1 | 58,094 | 12 | 116,189 |
Provide tags and a correct Python 3 solution for this coding contest problem.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20 | instruction | 0 | 58,095 | 12 | 116,190 |
Tags: greedy, math, sortings
Correct Solution:
```
N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
for i in range(N):
A[i] = A[i]*(i+1)*(N-i)
A.sort()
B.sort()
ans = 0
for i in range(N):
ans = ans + (A[i]*B[N-i-1])%998244353
print(ans%998244353)
``` | output | 1 | 58,095 | 12 | 116,191 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
n = int(input())
a = list(map(int,input().split()))
b = list(map(int,input().split()))
x = [a[i]*(i+1)*(n-i) for i in range(n)]
x.sort()
b.sort(reverse = True)
ans = 0
MOD = 998244353
for i in range(n):
ans += (x[i]*b[i])
ans %= MOD
print(ans)
``` | instruction | 0 | 58,096 | 12 | 116,192 |
Yes | output | 1 | 58,096 | 12 | 116,193 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
n = int(input())
m =998244353
a = list(map(int,input().split()))
b = list(map(int,input().split()))
for i in range(n):
a[i]*=(n-i)*(i+1)
a.sort()
b.sort(reverse = True)
ans = 0
for i in range(n):
ans= ((ans%m) + ((b[i]%m)*(a[i]%m))%m)%m
print(ans%m)
``` | instruction | 0 | 58,097 | 12 | 116,194 |
Yes | output | 1 | 58,097 | 12 | 116,195 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
MOD = 998244353
n = int(input())
a = [*map(int, input().split())]
b = [*map(int, input().split())]
for i in range(n):
a[i] = (a[i] * (n - i) * (i + 1))
a.sort(reverse = True)
b.sort()
res = 0
for i in range(n):
a[i] %= MOD
res += (a[i] * b[i]) % MOD
res %= MOD
print(res)
``` | instruction | 0 | 58,098 | 12 | 116,196 |
Yes | output | 1 | 58,098 | 12 | 116,197 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
import sys
n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
for i in range(n):
a[i] *= (i+1)*(n-i)
a = sorted(a)
b = sorted(b)[::-1]
s = 0
for i in range(n):
s = (s+a[i]*b[i])%998244353
print(s)
``` | instruction | 0 | 58,099 | 12 | 116,198 |
Yes | output | 1 | 58,099 | 12 | 116,199 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
from sys import stdin
from sys import stdout
MOD = 998244353
n = int(stdin.readline())
a = list(map(int, stdin.readline().split()))
b = list(map(int, stdin.readline().split()))
val = [0]*n
b.sort()
b.reverse()
for i in range(n):
val[i] = a[i]*(i+1)*(n-i)
val.sort()
ans = 0
for i in range(n):
ans+=((val[i]%MOD)*b[i])%MOD
print(ans)
``` | instruction | 0 | 58,100 | 12 | 116,200 |
No | output | 1 | 58,100 | 12 | 116,201 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
#------------------------template--------------------------#
import os
import sys
# from math import *
from collections import *
# from fractions import *
# from heapq import*
from bisect import *
from io import BytesIO, IOBase
def vsInput():
sys.stdin = open('input.txt', 'r')
sys.stdout = open('output.txt', 'w')
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
ALPHA='abcdefghijklmnopqrstuvwxyz'
M= 998244353
EPS=1e-6
def Ceil(a,b): return a//b+int(a%b>0)
def value():return tuple(map(int,input().split()))
def array():return [int(i) for i in input().split()]
def Int():return int(input())
def Str():return input()
def arrayS():return [i for i in input().split()]
#-------------------------code---------------------------#
# vsInput()
n = Int()
a = array()
b = array()
b.sort(reverse=True)
k = 0
extra = 0
for i in range(n):
here = (i+1)*(n-i)
a[i] = ( a[i] * here + M )%M
# a[i] = here
a.sort()
ans = 0
# print(a)
# print(b)
for i in range(n):
ans = (ans + (a[i]%M * b[i]%M ) %M + M)%M
print(ans)
``` | instruction | 0 | 58,101 | 12 | 116,202 |
No | output | 1 | 58,101 | 12 | 116,203 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
mod=998244353
n = int(input())
a = list(map(int,input().split()))
a = [[a[i],i] for i in range(n)]
a.sort()
b = sorted(map(int,input().split()),reverse = True)
res=[0]*n
for i in range(n):
res[a[i][1]] = (a[i][0]*b[i])%mod
i=n
j=1
ans=0
for _ in range(n):
ans+=(res[_]*i*j)%mod
i-=1
j+=1
print(ans)
``` | instruction | 0 | 58,102 | 12 | 116,204 |
No | output | 1 | 58,102 | 12 | 116,205 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
You are given two arrays a and b, both of length n.
Let's define a function f(l, r) = ∑_{l ≤ i ≤ r} a_i ⋅ b_i.
Your task is to reorder the elements (choose an arbitrary order of elements) of the array b to minimize the value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r). Since the answer can be very large, you have to print it modulo 998244353. Note that you should minimize the answer but not its remainder.
Input
The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in a and b.
The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^6), where a_i is the i-th element of a.
The third line of the input contains n integers b_1, b_2, ..., b_n (1 ≤ b_j ≤ 10^6), where b_j is the j-th element of b.
Output
Print one integer — the minimum possible value of ∑_{1 ≤ l ≤ r ≤ n} f(l, r) after rearranging elements of b, taken modulo 998244353. Note that you should minimize the answer but not its remainder.
Examples
Input
5
1 8 7 2 4
9 7 2 9 3
Output
646
Input
1
1000000
1000000
Output
757402647
Input
2
1 3
4 2
Output
20
Submitted Solution:
```
# https://codeforces.com/contest/1165/problem/E
n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
for i in range(n):
a[i] *= (i+1)*(n-i)
a.sort()
b.sort(reverse=True)
ans = [x*y for x, y in zip(a, b)]
print(sum(ans))
``` | instruction | 0 | 58,103 | 12 | 116,206 |
No | output | 1 | 58,103 | 12 | 116,207 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,331 | 12 | 116,662 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
x=int(input())
y=list(map(int,input().split()))
a,b,c=[],[],[]
for i in y:
if(i<0):
a.append(i)
elif(i>0):
b.append(i)
else:
c.append(i)
if(len(b)==0):
b.append(a[0])
b.append(a[1])
a.remove(a[0])
a.remove(a[0])
if(len(a)%2==0):
c.append(a[0])
a.remove(a[0])
print(len(a),*a)
print(len(b),*b)
print(len(c),*c)
``` | output | 1 | 58,331 | 12 | 116,663 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,332 | 12 | 116,664 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
n = int(input())
a = list(map(int,input().split()))
neg, pos = 0,0
ans = []
for i in a:
if i > 0 and pos == 0:
pos = i
elif i < 0 and neg == 0:
neg = i
else:
ans.append(i)
print(1,neg)
if pos > 0:
print(1,pos)
print(n-2,*ans)
else:
print(2,*[val for val in ans if val < 0][:2])
cnt = 2
print(n-3, end=' ')
for i in ans:
if i < 0:
if cnt > 0:
cnt -= 1
continue
print(i, end = " ")
``` | output | 1 | 58,332 | 12 | 116,665 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,333 | 12 | 116,666 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
neg = []
pos = []
input()
numbers = list(map(int, input().split()))
for num in numbers:
if num < 0:
neg.append(num)
elif num > 0:
pos.append(num)
res_pos = []
res_neg = []
res_zer = [0]
if len(pos) == 0:
res_pos.append(neg[0])
res_pos.append(neg[1])
res_neg.append(neg[2])
for num in neg[3:]:
res_zer.append(num)
else:
res_pos.append(pos[0])
for num in pos[1:]:
res_zer.append(num)
res_neg.append(neg[0])
for num in neg[1:]:
res_zer.append(num)
print(len(res_neg), end=' ')
for num in res_neg:
print(num, end=' ')
print('')
print(len(res_pos), end=' ')
for num in res_pos:
print(num, end=' ')
print('')
print(len(res_zer), end=' ')
for num in res_zer:
print(num, end=' ')
``` | output | 1 | 58,333 | 12 | 116,667 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,334 | 12 | 116,668 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
# Name: Sachdev Hitesh
# College : GLSICA
n = int(input())
l = list(map(int,input().split()))
ne,po,ze = [],[],[]
for a in l:
if a < 0:
if len(ne) == 0:
ne.append(a)
elif len(po) == 0 or (len(po) == 1 and po[0] < 0):
po.append(a)
else:
ze.append(a)
elif 0 < a:
if len(po) == 0:
po.append(a)
elif len(po) == 1 and po[0] < 0:
ze.append(po[0])
po[0] = a
else:
ze.append(a)
else:
ze.append(a)
print(len(ne), ' '.join(map(str,ne)))
print(len(po), ' '.join(map(str,po)))
print(len(ze), ' '.join(map(str,ze)))
``` | output | 1 | 58,334 | 12 | 116,669 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,335 | 12 | 116,670 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
n = int(input())
a = list(map(int, input().split()))
positive = []
negative = []
zero = []
for i in range(0,n):
if a[i] == 0:
zero.append(a[i])
if a[i] > 0:
positive.append(a[i])
if a[i] < 0:
negative.append(a[i])
if len(negative)%2 != 0:
m = negative[0]
x = [m]
del negative[0]
y = positive + negative
z = zero
else:
m = negative[0]
x = [m]
n = negative[1]
p = [n]
z = zero + p
del negative[0]
del negative[0]
y = positive + negative
x.insert(0, 1)
y.insert (0, len(y))
z.insert(0, len(z))
print(*x)
print(*y)
print(*z)
``` | output | 1 | 58,335 | 12 | 116,671 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,336 | 12 | 116,672 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
n = int(input())
a = list(map(int, input().split()))
pos1 = -1
neg1, neg2, neg3 = -1, -1, -1
for i in range(len(a)):
if a[i] > 0:
pos1 = i
elif a[i] < 0:
if neg1 == -1:
neg1 = i
elif neg2 == -1:
neg2 = i
else:
neg3 = i
if pos1 != -1:
print(1, a[neg1]) # Tập hợp < 0. Chỉ cần đúng 1 số âm thì tích sẽ âm
print(1, a[pos1]) # Tập hợp > 0. Chỉ cần đúng 1 số dương thì tích sẽ dương
print(n - 2, end = ' ')
for i in range(n): # In tất cả các số còn lại trong mảng a, ngoại trừ pos1 và neg1
if i != neg1 and i != pos1:
print(a[i], end = ' ')
else:
print(1, a[neg1])
print(2, a[neg2], a[neg3]) # Dùng hai số âm
print(n - 3, end = ' ')
for i in range(n):
if i not in [neg1, neg2, neg3]:
print(a[i], end = ' ')
``` | output | 1 | 58,336 | 12 | 116,673 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,337 | 12 | 116,674 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
n=int(input())
a=list(map(int,input().split()))
c=0
d=0
l1=[]
l2=[]
l3=[]
for i in a:
if i<0:
c+=1
l1.append(i)
if i==0:
l2.append(i)
if i>0:
l3.append(i)
if c%2==0:
l2.append(l1[0])
l1=l1[1:]
if l3==[]:
l3.append(l1[0])
l3.append(l1[1])
l1=l1[2:]
print(len(l1),end=" ")
print(*l1)
print(len(l3),end=" ")
print(*l3)
print(len(l2),end=" ")
print(*l2)
``` | output | 1 | 58,337 | 12 | 116,675 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0 | instruction | 0 | 58,338 | 12 | 116,676 |
Tags: brute force, constructive algorithms, implementation
Correct Solution:
```
n = int(input())
lst = [int(i) for i in input().split()]
a = [i for i in lst if i < 0]
b = [i for i in lst if i > 0]
c = [i for i in lst if i == 0]
if len(b) == 0:
b, a = a[: 2], a[2: ]
c += a[1:]
a = a[0]
print(1, a)
print(len(b), ' '.join(str(i) for i in b))
print(len(c), ' '.join(str(i) for i in c))
``` | output | 1 | 58,338 | 12 | 116,677 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0
Submitted Solution:
```
st,nd,rd=[],[],[];input();nums=sorted(input().split())
if int(nums[-1])>0:
st.append(nums[0]);nd.append(nums[-1])
for i in nums[1:-1]: rd.append(i)
else:
st.append(nums[0]);nd.append(nums[1]);nd.append(nums[2]);
for i in nums[3:]: rd.append(i)
print(str(len(st))+' '+' '.join(st)+'\n'+str(len(nd))+' '+' '.join(nd)+'\n'+str(len(rd))+' '+ ' '.join(rd))
``` | instruction | 0 | 58,339 | 12 | 116,678 |
Yes | output | 1 | 58,339 | 12 | 116,679 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0
Submitted Solution:
```
t=int(input())
a=list(map(int,input().split()))
b=[]
c=[]
d=[]
for i in a:
if (i<0):
b.append(i)
a.remove(i)
break
for i in a:
if (i>0):
c.append(i)
a.remove(i)
break
a.sort()
if (len(c)==0):
c.append(a[0])
c.append(a[1])
a.pop(0)
a.pop(0)
print(len(b),*b)
print(len(c),*c)
print(len(a),*a)
``` | instruction | 0 | 58,340 | 12 | 116,680 |
Yes | output | 1 | 58,340 | 12 | 116,681 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:
1. The product of all numbers in the first set is less than zero ( < 0).
2. The product of all numbers in the second set is greater than zero ( > 0).
3. The product of all numbers in the third set is equal to zero.
4. Each number from the initial array must occur in exactly one set.
Help Vitaly. Divide the given array.
Input
The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.
Output
In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.
In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.
In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.
The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.
Examples
Input
3
-1 2 0
Output
1 -1
1 2
1 0
Input
4
-1 -2 -3 0
Output
1 -1
2 -3 -2
1 0
Submitted Solution:
```
n=int(input())
ls=list(map(int,input().split()))
ls.sort()
def index(ls,n):
for i in range(n):
if ls[i]==0:
return i
soduong=n-index(ls,n)-1
if soduong>0:
print(1,ls[0])
print(1,ls[len(ls)-1])
print(len(ls)-2,end=' ')
i=1
while i<len(ls)-1:
print(ls[i],end=' ')
i+=1
else:
print(1,ls[0])
print(2,ls[1],ls[2])
i=3
print(len(ls)-3,end=' ')
while i<len(ls):
print(ls[i],end=' ')
i+=1
``` | instruction | 0 | 58,341 | 12 | 116,682 |
Yes | output | 1 | 58,341 | 12 | 116,683 |
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