message stringlengths 2 44.5k | message_type stringclasses 2
values | message_id int64 0 1 | conversation_id int64 42 109k | cluster float64 5 5 | __index_level_0__ int64 84 217k |
|---|---|---|---|---|---|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Bessie and the cows are playing with sequences and need your help. They start with a sequence, initially containing just the number 0, and perform n operations. Each operation is one of the following:
1. Add the integer xi to the first ai elements of the sequence.
2. Append an integer ki to the end of the sequence. (And hence the size of the sequence increases by 1)
3. Remove the last element of the sequence. So, the size of the sequence decreases by one. Note, that this operation can only be done if there are at least two elements in the sequence.
After each operation, the cows would like to know the average of all the numbers in the sequence. Help them!
Input
The first line contains a single integer n (1 ≤ n ≤ 2·105) — the number of operations. The next n lines describe the operations. Each line will start with an integer ti (1 ≤ ti ≤ 3), denoting the type of the operation (see above). If ti = 1, it will be followed by two integers ai, xi (|xi| ≤ 103; 1 ≤ ai). If ti = 2, it will be followed by a single integer ki (|ki| ≤ 103). If ti = 3, it will not be followed by anything.
It is guaranteed that all operations are correct (don't touch nonexistent elements) and that there will always be at least one element in the sequence.
Output
Output n lines each containing the average of the numbers in the sequence after the corresponding operation.
The answer will be considered correct if its absolute or relative error doesn't exceed 10 - 6.
Examples
Input
5
2 1
3
2 3
2 1
3
Output
0.500000
0.000000
1.500000
1.333333
1.500000
Input
6
2 1
1 2 20
2 2
1 2 -3
3
3
Output
0.500000
20.500000
14.333333
12.333333
17.500000
17.000000
Note
In the second sample, the sequence becomes <image>
Submitted Solution:
```
#besme taala
#ya_hossein
from sys import stdin
input = stdin.readline
n, sum, point = int(input()), 0, 1
num = (n+1)*[0]
f = (n+1)*[0]
for i in range(n):
k = list(map(int, input().split()))
if k[0] == 1:
f[k[1] - 1] += k[2]
sum += k[2]*k[1]
elif k[0] == 2:
num[point] = k[1]
sum += k[1]
point += 1
elif k[0] == 3:
point -= 1
sum -= num[point] + f[point]
f[point - 1] += f[point]
f[point] = 0
print('%.6f' % (sum / point))
``` | instruction | 0 | 65,895 | 5 | 131,790 |
Yes | output | 1 | 65,895 | 5 | 131,791 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Bessie and the cows are playing with sequences and need your help. They start with a sequence, initially containing just the number 0, and perform n operations. Each operation is one of the following:
1. Add the integer xi to the first ai elements of the sequence.
2. Append an integer ki to the end of the sequence. (And hence the size of the sequence increases by 1)
3. Remove the last element of the sequence. So, the size of the sequence decreases by one. Note, that this operation can only be done if there are at least two elements in the sequence.
After each operation, the cows would like to know the average of all the numbers in the sequence. Help them!
Input
The first line contains a single integer n (1 ≤ n ≤ 2·105) — the number of operations. The next n lines describe the operations. Each line will start with an integer ti (1 ≤ ti ≤ 3), denoting the type of the operation (see above). If ti = 1, it will be followed by two integers ai, xi (|xi| ≤ 103; 1 ≤ ai). If ti = 2, it will be followed by a single integer ki (|ki| ≤ 103). If ti = 3, it will not be followed by anything.
It is guaranteed that all operations are correct (don't touch nonexistent elements) and that there will always be at least one element in the sequence.
Output
Output n lines each containing the average of the numbers in the sequence after the corresponding operation.
The answer will be considered correct if its absolute or relative error doesn't exceed 10 - 6.
Examples
Input
5
2 1
3
2 3
2 1
3
Output
0.500000
0.000000
1.500000
1.333333
1.500000
Input
6
2 1
1 2 20
2 2
1 2 -3
3
3
Output
0.500000
20.500000
14.333333
12.333333
17.500000
17.000000
Note
In the second sample, the sequence becomes <image>
Submitted Solution:
```
#------------------------template--------------------------#
import os
import sys
from math import *
from collections import *
from fractions import *
from bisect import *
from heapq 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=10**9+7
EPS=1e-6
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()
s=0
top=[0]
for i in range(n):
query=input()
if(query[0]=='1'):
_,a,x=[int(i) for i in query.split()]
s+=a*x
top[a-1]+=x
elif(query[0]=='2'):
_,x=[int(i) for i in query.split()]
s+=x
top[-1]-=x
top.append(x)
else:
ele=top.pop()
s-=ele
top[-1]+=ele
print(s/len(top))
``` | instruction | 0 | 65,896 | 5 | 131,792 |
Yes | output | 1 | 65,896 | 5 | 131,793 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Bessie and the cows are playing with sequences and need your help. They start with a sequence, initially containing just the number 0, and perform n operations. Each operation is one of the following:
1. Add the integer xi to the first ai elements of the sequence.
2. Append an integer ki to the end of the sequence. (And hence the size of the sequence increases by 1)
3. Remove the last element of the sequence. So, the size of the sequence decreases by one. Note, that this operation can only be done if there are at least two elements in the sequence.
After each operation, the cows would like to know the average of all the numbers in the sequence. Help them!
Input
The first line contains a single integer n (1 ≤ n ≤ 2·105) — the number of operations. The next n lines describe the operations. Each line will start with an integer ti (1 ≤ ti ≤ 3), denoting the type of the operation (see above). If ti = 1, it will be followed by two integers ai, xi (|xi| ≤ 103; 1 ≤ ai). If ti = 2, it will be followed by a single integer ki (|ki| ≤ 103). If ti = 3, it will not be followed by anything.
It is guaranteed that all operations are correct (don't touch nonexistent elements) and that there will always be at least one element in the sequence.
Output
Output n lines each containing the average of the numbers in the sequence after the corresponding operation.
The answer will be considered correct if its absolute or relative error doesn't exceed 10 - 6.
Examples
Input
5
2 1
3
2 3
2 1
3
Output
0.500000
0.000000
1.500000
1.333333
1.500000
Input
6
2 1
1 2 20
2 2
1 2 -3
3
3
Output
0.500000
20.500000
14.333333
12.333333
17.500000
17.000000
Note
In the second sample, the sequence becomes <image>
Submitted Solution:
```
s = 0
ele = 1
n = int(input())
l =[0] *(n+2)
a =[0] *(n+2)
ans =[0]* n;
for x in range(n):
inp = list(map(int,input().strip().split()))
if inp[0] == 1:
s += inp[1] * inp[2];
a[inp[1] - 1] += inp[2]
elif inp[0] == 2:
s += inp[1]
l[ele] = inp[1]
ele += 1;
else:
ele -= 1
s -= l[ele] + a[ele]
a[ele -1 ] += a[ele]
a[ele] = 0
ans[x] =str( s / ele)
print("\n".join(ans))
``` | instruction | 0 | 65,897 | 5 | 131,794 |
Yes | output | 1 | 65,897 | 5 | 131,795 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Bessie and the cows are playing with sequences and need your help. They start with a sequence, initially containing just the number 0, and perform n operations. Each operation is one of the following:
1. Add the integer xi to the first ai elements of the sequence.
2. Append an integer ki to the end of the sequence. (And hence the size of the sequence increases by 1)
3. Remove the last element of the sequence. So, the size of the sequence decreases by one. Note, that this operation can only be done if there are at least two elements in the sequence.
After each operation, the cows would like to know the average of all the numbers in the sequence. Help them!
Input
The first line contains a single integer n (1 ≤ n ≤ 2·105) — the number of operations. The next n lines describe the operations. Each line will start with an integer ti (1 ≤ ti ≤ 3), denoting the type of the operation (see above). If ti = 1, it will be followed by two integers ai, xi (|xi| ≤ 103; 1 ≤ ai). If ti = 2, it will be followed by a single integer ki (|ki| ≤ 103). If ti = 3, it will not be followed by anything.
It is guaranteed that all operations are correct (don't touch nonexistent elements) and that there will always be at least one element in the sequence.
Output
Output n lines each containing the average of the numbers in the sequence after the corresponding operation.
The answer will be considered correct if its absolute or relative error doesn't exceed 10 - 6.
Examples
Input
5
2 1
3
2 3
2 1
3
Output
0.500000
0.000000
1.500000
1.333333
1.500000
Input
6
2 1
1 2 20
2 2
1 2 -3
3
3
Output
0.500000
20.500000
14.333333
12.333333
17.500000
17.000000
Note
In the second sample, the sequence becomes <image>
Submitted Solution:
```
#besme taala
#ya_hossein
import sys
input = sys.stdin.readline
n, sum, point = int(input()), 0, 1
num = (n+1)*[0]
f = (n+1)*[0]
for i in range(n):
k = list(map(int, input().split()))
if k[0] == 1:
f[k[1] - 1] += k[2]
sum += k[2]*k[1]
elif k[0] == 2:
num[point] += k[1]
sum += k[1]
point += 1
elif k[0] == 3:
sum -= num[point - 1]
sum -= f[point - 1]
point -= 1
f[point - 1] += f[point]
print('%.9f' % (sum / point))
``` | instruction | 0 | 65,899 | 5 | 131,798 |
No | output | 1 | 65,899 | 5 | 131,799 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Bessie and the cows are playing with sequences and need your help. They start with a sequence, initially containing just the number 0, and perform n operations. Each operation is one of the following:
1. Add the integer xi to the first ai elements of the sequence.
2. Append an integer ki to the end of the sequence. (And hence the size of the sequence increases by 1)
3. Remove the last element of the sequence. So, the size of the sequence decreases by one. Note, that this operation can only be done if there are at least two elements in the sequence.
After each operation, the cows would like to know the average of all the numbers in the sequence. Help them!
Input
The first line contains a single integer n (1 ≤ n ≤ 2·105) — the number of operations. The next n lines describe the operations. Each line will start with an integer ti (1 ≤ ti ≤ 3), denoting the type of the operation (see above). If ti = 1, it will be followed by two integers ai, xi (|xi| ≤ 103; 1 ≤ ai). If ti = 2, it will be followed by a single integer ki (|ki| ≤ 103). If ti = 3, it will not be followed by anything.
It is guaranteed that all operations are correct (don't touch nonexistent elements) and that there will always be at least one element in the sequence.
Output
Output n lines each containing the average of the numbers in the sequence after the corresponding operation.
The answer will be considered correct if its absolute or relative error doesn't exceed 10 - 6.
Examples
Input
5
2 1
3
2 3
2 1
3
Output
0.500000
0.000000
1.500000
1.333333
1.500000
Input
6
2 1
1 2 20
2 2
1 2 -3
3
3
Output
0.500000
20.500000
14.333333
12.333333
17.500000
17.000000
Note
In the second sample, the sequence becomes <image>
Submitted Solution:
```
def sr(a, n):
return a / n
n = int(input())
a = [0]
sm = 0
l = 1
for i in range(n):
t = list(map(int, input().split()))
if t[0] == 1:
for i in range(min(l, t[2])):
a[i] += t[1]
sm += t[1]
print(sr(sm, l))
elif t[0] == 2:
a += [t[1]]
sm += t[1]
l += 1
print(sr(sm, l))
else:
l -= 1
sm -= a[-1]
a.pop(-1)
print(sr(sm, l))
``` | instruction | 0 | 65,902 | 5 | 131,804 |
No | output | 1 | 65,902 | 5 | 131,805 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,210 | 5 | 132,420 |
"Correct Solution:
```
N=int(input())
A=list(map(int,input().split()))
c=0
for i in range(N):
if A[i]%2==1 and i%2==0:
c+=1
print(c)
``` | output | 1 | 66,210 | 5 | 132,421 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,211 | 5 | 132,422 |
"Correct Solution:
```
N=int(input())
A=list(map(int,input().split()))
P=0
for i in range(N):
if i&1==0 and A[i]&1==1:
P+=1
print(P)
``` | output | 1 | 66,211 | 5 | 132,423 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,212 | 5 | 132,424 |
"Correct Solution:
```
a=int(input())
n=[int(x) for x in input().split()]
n=n[::2]
c=0
for i in n:
if i % 2 == 1:
c+=1
print(c)
``` | output | 1 | 66,212 | 5 | 132,425 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,213 | 5 | 132,426 |
"Correct Solution:
```
n=int(input())
a=list(map(int,input().split()))
c=0
for i in range(0,len(a),2):
if a[i]%2==1:
c+=1
print(c)
``` | output | 1 | 66,213 | 5 | 132,427 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,214 | 5 | 132,428 |
"Correct Solution:
```
N = int(input())
A = list(map(int,input().split()))
ans = sum([a % 2 == 1 for a in A[::2]])
print(ans)
``` | output | 1 | 66,214 | 5 | 132,429 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,215 | 5 | 132,430 |
"Correct Solution:
```
N = int(input())
A = [1 if int(i)%2 else 0 for i in input().split()][::2]
print(sum(A))
``` | output | 1 | 66,215 | 5 | 132,431 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,216 | 5 | 132,432 |
"Correct Solution:
```
N = int(input())
a = list(map(int, input().split()))
c = 0
for i in range(N):
c += i%2==0 and a[i]%2
print(c)
``` | output | 1 | 66,216 | 5 | 132,433 |
Provide a correct Python 3 solution for this coding contest problem.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3 | instruction | 0 | 66,217 | 5 | 132,434 |
"Correct Solution:
```
N=int(input())
A=list(map(int,input().split()))
out=0
for I in range(0,N,2):
if A[I]%2==1:
out+=1
print(out)
``` | output | 1 | 66,217 | 5 | 132,435 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
_,*A=map(int,open(0).read().split());print(sum([i%2for i in A[::2]]))
``` | instruction | 0 | 66,218 | 5 | 132,436 |
Yes | output | 1 | 66,218 | 5 | 132,437 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
n = int(input())
c = i = 0
for a in map(int, input().split()):
i += 1
if i%2 and a%2: c += 1
print(c)
``` | instruction | 0 | 66,219 | 5 | 132,438 |
Yes | output | 1 | 66,219 | 5 | 132,439 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
input()
a=map(int,input().split())
b=0
for i,x in enumerate(a):
if (i+1)%2==1 and x%2==1:
b+=1
print(b)
``` | instruction | 0 | 66,220 | 5 | 132,440 |
Yes | output | 1 | 66,220 | 5 | 132,441 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
n, *a = map(int, open(0).read().split())
cnt = 0
for i in range(0, n, 2):
if a[i] % 2 == 1 :
cnt += 1
print(cnt)
``` | instruction | 0 | 66,221 | 5 | 132,442 |
Yes | output | 1 | 66,221 | 5 | 132,443 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
num=input()
masu=list(map(lambda x:int(x),input().split()))
masu=[i for i in masu if i%2!=0 and (masu.index(i)+1)%2!=0]
print(len(masu))
``` | instruction | 0 | 66,222 | 5 | 132,444 |
No | output | 1 | 66,222 | 5 | 132,445 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
n = int(input())
a = list(map(int, input().split()))
ans = 0
for i in range(1, n, 2):
if a[i] % 2 == 1: ans += 1
print(ans)
``` | instruction | 0 | 66,223 | 5 | 132,446 |
No | output | 1 | 66,223 | 5 | 132,447 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
N = int(input())
a = list(int,map(input().split())
i = 0
for x,y in enumerate a:
b=x+1
if b%2!=0 and a%2!=0:
i+=1
print(i)
``` | instruction | 0 | 66,224 | 5 | 132,448 |
No | output | 1 | 66,224 | 5 | 132,449 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.
How many squares i satisfy both of the following conditions?
* The assigned number, i, is odd.
* The written integer is odd.
Constraints
* All values in input are integers.
* 1 \leq N, a_i \leq 100
Input
Input is given from Standard Input in the following format:
N
a_1 a_2 \cdots a_N
Output
Print the number of squares that satisfy both of the conditions.
Examples
Input
5
1 3 4 5 7
Output
2
Input
15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14
Output
3
Submitted Solution:
```
N = int(input())
A = list(map(int, input().split()))
ans = 0
for i in range(N):
if A[i] % 2 == 1 and i % 2 == 1:
ans += 1
print(ans)
``` | instruction | 0 | 66,225 | 5 | 132,450 |
No | output | 1 | 66,225 | 5 | 132,451 |
Provide a correct Python 3 solution for this coding contest problem.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28 | instruction | 0 | 66,242 | 5 | 132,484 |
"Correct Solution:
```
S = input()
N = len(S)
a = [0] * (N + 1)
for i in range(N):
if S[i] == '<':
a[i + 1] = a[i] + 1
for i in range(N - 1, -1, -1):
if S[i] == '>' and a[i] <= a[i+1]:
a[i] = a[i+1] + 1
print(sum(a))
``` | output | 1 | 66,242 | 5 | 132,485 |
Provide a correct Python 3 solution for this coding contest problem.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28 | instruction | 0 | 66,244 | 5 | 132,488 |
"Correct Solution:
```
S = input()
List=[0]*(len(S)+1)
i=0
while i<len(S):
if S[i]=="<":
List[i+1]=List[i]+1
i+=1
j=1
while j<=len(S):
if S[-j]==">":
List[-(j+1)]=max(List[-j]+1,List[-(j+1)])
j+=1
print(sum(List))
``` | output | 1 | 66,244 | 5 | 132,489 |
Provide a correct Python 3 solution for this coding contest problem.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28 | instruction | 0 | 66,245 | 5 | 132,490 |
"Correct Solution:
```
s = input()
n = len(s) + 1
a = [0 for i in range(n)]
for i in range(n - 1):
if s[i] == '<':
a[i + 1] = max(a[i + 1], a[i] + 1)
for i in reversed(range(n - 1)):
if s[i] == '>':
a[i] = max(a[i], a[i + 1] + 1)
ans = sum(a)
print(ans)
``` | output | 1 | 66,245 | 5 | 132,491 |
Provide a correct Python 3 solution for this coding contest problem.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28 | instruction | 0 | 66,246 | 5 | 132,492 |
"Correct Solution:
```
S=input()
N=[[0,0] for i in range(len(S)+1)]
for i in range(len(S)):
if(S[i]=="<"):
N[i+1][0]=N[i][0]+1
if(S[-1-i]==">"):
N[-2-i][1]=N[-1-i][1]+1
s=0
for i in range(len(N)):
s+=max(N[i][0],N[i][1])
print(s)
``` | output | 1 | 66,246 | 5 | 132,493 |
Provide a correct Python 3 solution for this coding contest problem.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28 | instruction | 0 | 66,247 | 5 | 132,494 |
"Correct Solution:
```
S = input()
x = len(S)
ans = [0] * (x+1)
for i in range(x):
if S[i] == '<':
ans[i+1] = ans[i] + 1
for i in range(x-1,-1,-1):
if S[i] == '>':
ans[i] = max(ans[i],ans[i+1]+1)
print(sum(ans))
``` | output | 1 | 66,247 | 5 | 132,495 |
Provide a correct Python 3 solution for this coding contest problem.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28 | instruction | 0 | 66,249 | 5 | 132,498 |
"Correct Solution:
```
s = input()
n = len(s) + 1
v = [0]*n
for i in range(n-1):
if s[i] == "<":
v[i+1] = v[i] + 1
for j in range(n-1):
if s[-j-1] == ">":
if v[-j-2] <= v[-j-1]:
v[-j-2] = v[-j-1] + 1
print(sum(v))
``` | output | 1 | 66,249 | 5 | 132,499 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
S = input()
l = len(S)
A = [0 for i in range(l+1)]
for i in range(l):
if S[i] == '<':
A[i+1] = max(A[i+1],A[i]+1)
for i in range(l-1,-1,-1):
if S[i] == '>':
A[i] = max(A[i+1]+1,A[i])
print(sum(A))
``` | instruction | 0 | 66,250 | 5 | 132,500 |
Yes | output | 1 | 66,250 | 5 | 132,501 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
s=input()
n=len(s)
a=[0]*(n+1)
for i in range(n):
if s[i]=="<":
a[i+1]=a[i]+1
for i in reversed(range(n)):
if s[i]==">":
a[i]=max(a[i+1]+1,a[i])
print(sum(a))
``` | instruction | 0 | 66,251 | 5 | 132,502 |
Yes | output | 1 | 66,251 | 5 | 132,503 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
s = input()
arr = [0]
for i in range(len(s)):
if s[i] == '<':
arr.append(arr[i]+1)
else:
arr.append(0)
#print(len(arr))
for i in reversed(range(len(s))):
if s[i] == '>':
arr[i] = max(arr[i],arr[i+1]+1)
print(sum(arr))
``` | instruction | 0 | 66,252 | 5 | 132,504 |
Yes | output | 1 | 66,252 | 5 | 132,505 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
S = [i for i in input()]
N = len(S) + 1
A = [0]*N
for i in range(len(S)):
if S[i]=='<':
A[i+1]=A[i]+1
for i in range(len(S)-1, -1, -1):
if S[i]=='>':
A[i]=max(A[i], A[i+1]+1)
print(sum(A))
``` | instruction | 0 | 66,253 | 5 | 132,506 |
Yes | output | 1 | 66,253 | 5 | 132,507 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
import math
S = list(input())
ans = 0
lrlist = []
left = 0
right = 0
if S[0] == '<':
flag = 0
else:
flag = 1
anslist = []
for i in range(len(S)):
if S[i-1] != S[i]:
lrlist.append(max(left, right))
right = 0
left = 0
if S[i] == '>':
left += 1
else:
right += 1
if i == len(S)-1:
lrlist.append(max(left, right))
for i in range(len(lrlist)):
if flag % 2 == 0:
if lrlist[i] != 1:
ans += (1/2)*(lrlist[i])*(lrlist[i]+1)
anslist.append((1/2)*(lrlist[i])*(lrlist[i]+1))
else:
if i == 0:
ans += 1
anslist.append(1)
flag += 1
else: #flag % 2 == 1
if lrlist[i] != 1:
if lrlist[i-1] > lrlist[i]:
ans += (1/2)*(lrlist[i]-1)*(lrlist[i])
anslist.append((1/2)*(lrlist[i]-1)*(lrlist[i]))
else:
ans += (1/2)*(lrlist[i])*(lrlist[i]+1)
anslist.append((1/2)*(lrlist[i])*(lrlist[i]+1))
flag += 1
print(int(ans))
``` | instruction | 0 | 66,254 | 5 | 132,508 |
No | output | 1 | 66,254 | 5 | 132,509 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
s = input()
j = []
k = []
for i in range(len(s)+1):
left = s[0:i]
right = s[i:]
l = 0
r = 0
for i in range(len(left)-1,-1,-1):
if left[i] != "<":
break
else:
l += 1
for i in range(len(right)):
if right[i] != ">":
break
else:
r += 1
j.append(max(l,r))
print(sum(j))
``` | instruction | 0 | 66,255 | 5 | 132,510 |
No | output | 1 | 66,255 | 5 | 132,511 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
s = input()
left, right = [0,], []
a, b = 0, 0
for i in range(len(s)):
a = a+1 if s[i] == '<' else 0
left.append(a)
b = b+1 if s[-1*i] == '>' else 0
right.append(b)
right.append(0)
right.reverse()
ans = sum(max(x, y) for x, y in zip(left, right))
print(ans)
``` | instruction | 0 | 66,256 | 5 | 132,512 |
No | output | 1 | 66,256 | 5 | 132,513 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Given is a string S of length N-1. Each character in S is `<` or `>`.
A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):
* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Constraints
* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.
Input
Input is given from Standard Input in the following format:
S
Output
Find the minimum possible sum of the elements of a good sequence of N non-negative integers.
Examples
Input
<>>
Output
3
Input
<>>><<><<<<<>>><
Output
28
Submitted Solution:
```
s=input()
n=len(s)
i,cntl,cntg=0,0,0
res,fl,fg=0,0,0
while(i<n):
if s[i]=='<':
while(s[i]!='>'):
fl=1
cntl+=1
i+=1
else:
while(s[i]!='<'):
fg=1
cntg+=1
i+=1
if fl==1 and fg==1:
res+=max(cntl,cntg)
cntl-=1
cntg-=1
res+=cntl*(cntl+1)//2
res+=cntg*(cntg+1)//2
fl,fg,cntl,cntg=0,0,0,0
if fl:
res+=cntl*(cntl+1)//2
if fg:
res+=cntg*(cntg+1)//2
print(res)
``` | instruction | 0 | 66,257 | 5 | 132,514 |
No | output | 1 | 66,257 | 5 | 132,515 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,258 | 5 | 132,516 |
"Correct Solution:
```
N = int(input())
A = [int(s) for s in input().split(' ')]
A.sort()
print(A[N - 1] + sum([abs(a) for a in A[1:N - 1]]) - A[0])
answer = ''
for i in range(1, len(A) - 1):
if(A[i] > 0):
answer += "{} {}\n".format(A[0], A[i])
A[0] -= A[i]
else:
answer += "{} {}\n".format(A[N - 1], A[i])
A[N - 1] -= A[i]
answer += "{} {}\n".format(A[N - 1], A[0])
print(answer)
``` | output | 1 | 66,258 | 5 | 132,517 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,259 | 5 | 132,518 |
"Correct Solution:
```
n=int(input())
a=sorted(list(map(int,input().split())))
m=-a[0]
for i in a[1:-1]:
if i<0:m-=i
else:m+=i
m+=a[-1]
print(m)
b,c=a[0],a[-1]
for i in a[1:-1]:
if i>0:
print(b,i)
b-=i
else:
print(c,i)
c-=i
print(c,b)
``` | output | 1 | 66,259 | 5 | 132,519 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,260 | 5 | 132,520 |
"Correct Solution:
```
from bisect import bisect_left
n=int(input())
a=list(map(int,input().split()))
a.sort()
if(a[0]>=0):
print(sum(a[1:])-a[0])
ans=a[0]
for i in a[1:n-1]:
print(ans,i)
ans-=i
print(a[-1],ans)
elif(a[-1]<=0):
print(a[-1]-sum(a[:n-1]))
ans=a[-1]
for i in a[:n-1]:
print(ans,i)
ans-=i
else:
print(sum([abs(i) for i in a]))
b=bisect_left(a,0)
ans=a[0]
tmp=a[-1]
for i in a[b:n-1]:
print(ans,i)
ans-=i
for i in a[1:b]:
print(tmp,i)
tmp-=i
print(tmp,ans)
``` | output | 1 | 66,260 | 5 | 132,521 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,261 | 5 | 132,522 |
"Correct Solution:
```
N = int(input())
A = list(map(int,input().split()))
ans = []
A.sort()
a = A.pop(0)
b = A.pop()
N -= 2
k = 1
for i in range(N):
y = A.pop()
if y<0:k=0
if k:
ans.append([a,y])
a -= y
else:
ans.append([b,y])
b -= y
ans.append([b,a])
print(b-a)
for a in ans: print(*a)
``` | output | 1 | 66,261 | 5 | 132,523 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,262 | 5 | 132,524 |
"Correct Solution:
```
n = int(input())
num_list = sorted([ int(v) for v in input().split() ])
ope_list = [ None for i in range(n-1) ]
for i in range(n-2):
if num_list[i+1] >= 0:
ope_list[i] = (num_list[0],num_list[i+1])
num_list[0] -= num_list[i+1]
else:
ope_list[i] = (num_list[-1],num_list[i+1])
num_list[-1] -= num_list[i+1]
ope_list[-1] = (num_list[-1], num_list[0])
ans = num_list[-1] - num_list[0]
print(ans)
for i in range(n-1):
print(*ope_list[i])
``` | output | 1 | 66,262 | 5 | 132,525 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,263 | 5 | 132,526 |
"Correct Solution:
```
N = int(input())
A = sorted(list(map(int,input().split())))
p = A[-1]
n = A[0]
ans_list = []
for a in A[1:-1]:
if a >= 0:
ans_list.append((n, a))
n -= a
else:
ans_list.append((p, a))
p -= a
M = p - n
ans_list.append((p, n))
print(M)
for x, y in ans_list:
print(x, y)
``` | output | 1 | 66,263 | 5 | 132,527 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,264 | 5 | 132,528 |
"Correct Solution:
```
import heapq
N = int(input())
a = map(int,input().split())
heap = []
max_val = -10001
for i in a:
if i > max_val:
max_val = i
heapq.heappush(heap,i)
log = []
min_val = heapq.heappop(heap)
for _ in range(N-2):
tg = heapq.heappop(heap)
if tg < 0:
log.append([max_val, tg])
max_val -= tg
else:
log.append([min_val, tg])
min_val -= tg
print(max_val - min_val)
log.append([max_val,min_val])
for l in log:
print(l[0],l[1])
``` | output | 1 | 66,264 | 5 | 132,529 |
Provide a correct Python 3 solution for this coding contest problem.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0 | instruction | 0 | 66,265 | 5 | 132,530 |
"Correct Solution:
```
# C
if __name__=='__main__':
N = int(input())
A = list(map(int,input().split()))
A.sort()
k = N-1
x = 0
for i in range(1,N):
if A[i]>0:
k = i
break
M = sum(A[k:])-sum(A[:k])
print(M)
x = A[k-1]
for i in range(k,N-1):
print('{} {}'.format(x,A[i]))
x = x - A[i]
print('{} {}'.format(A[N-1],x))
x = A[N-1] - x
for i in range(k-1):
print('{} {}'.format(x,A[i]))
x = x -A[i]
``` | output | 1 | 66,265 | 5 | 132,531 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0
Submitted Solution:
```
N = list(map(int, input().split()))
A = list(map(int, input().split()))
log = ""
L=max(A)
S=min(A)
A.remove(L)
A.remove(S)
for x in A:
if x>0:
log += "\n"+str(S)+" "+str(x)
S = S-x
else:
log += "\n"+str(L)+" "+str(x)
L = L-x
log += "\n"+str(L)+" "+str(S)
L = L-S
print(str(L)+log)
``` | instruction | 0 | 66,266 | 5 | 132,532 |
Yes | output | 1 | 66,266 | 5 | 132,533 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0
Submitted Solution:
```
n = int(input())
a = list(map(int, input().split()))
a.sort()
def answer():
p = sum(1 for i in a if i < 0)
q = sum(1 for i in a if i >= 0)
if p == 0:
p += 1
q -= 1
if q == 0:
p -= 1
q += 1
list_xy = []
for i in range(q - 1):
list_xy.append((a[0], a[p + i]))
a[0] -= a[p + i]
for i in range(p):
list_xy.append((a[-1], a[i]))
a[-1] -= a[i]
return a[-1], list_xy
m, list_xy = answer()
print(m)
for x, y in list_xy:
print(x, y)
``` | instruction | 0 | 66,267 | 5 | 132,534 |
Yes | output | 1 | 66,267 | 5 | 132,535 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0
Submitted Solution:
```
N = int(input())
a = tuple(sorted(map(int, input().split())))
ans = []
res = 0
m = a[0] # 最後に引く側
p = a[-1] # 最後に足す側
for aa in a[1:N - 1]:
if aa < 0:
res -= aa
ans.append((p, aa))
p -= aa
else:
res += aa
ans.append((m, aa))
m -= aa
ans.append((p, m))
res += a[-1] - a[0]
print(res)
for aa in ans:
print(*aa)
``` | instruction | 0 | 66,268 | 5 | 132,536 |
Yes | output | 1 | 66,268 | 5 | 132,537 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0
Submitted Solution:
```
N = int(input())
*A, = map(int,input().split())
A.sort()
for i,a in enumerate(A):
if a>=0:break
B = A[:i]
C = A[i:]
ans = []
if not B:
x = C[0]
for a in C[1:-1]:
ans.append((x,a))
x -= a
ans.append((C[-1],x))
x = C[-1] - x
elif not C:
x = B[-1]
for a in B[:-1]:
ans.append((x,a))
x -= a
else:
x = B[0]
for a in C[1:]:
ans.append((x,a))
x -= a
ans.append((C[0],x))
x = C[0]-x
for a in B[1:]:
ans.append((x,a))
x -= a
print(x)
for out in ans:
print(*out)
``` | instruction | 0 | 66,269 | 5 | 132,538 |
Yes | output | 1 | 66,269 | 5 | 132,539 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0
Submitted Solution:
```
import collections
def solve():
n = int(input())
a = collections.deque(sorted(list(int(i) for i in input().split())))
big = a.pop()
mini = a.popleft()
queue = collections.deque([])
#print(big,mini)
while (a):
if a[0] <= 0:
tmp = a.popleft()
queue.append((big,tmp))
big -= tmp
else:
tmp = a.pop()
queue.append((tmp,mini))
mini -= tmp
print(big-mini)
queue.append((big,mini))
for i in range(len(queue)):
print(*queue[i])
solve()
``` | instruction | 0 | 66,270 | 5 | 132,540 |
No | output | 1 | 66,270 | 5 | 132,541 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0
Submitted Solution:
```
n = int(input())
a = list(map(int,input().split()))
a = sorted(a)
#print(a)
if a[0] < 0:
ans = 0
negn = 0
for i in range(n):
ans += abs(a[i])
if a[i]<0:
negn += 1
print(ans)
s = a[0]
for i in range(negn , n-1):
print(s,a[i])
s = s-a[i]
k = a[-1]
for i in range(1,negn):
print(k,a[i])
k = k-a[i]
print(k,s)
else:
ans = 0
for i in range(n):
ans += abs(a[i])
print(ans-2*a[0])
m = a[0]
for i in range(1,n-1):
print(m,a[i])
m = m-a[i]
print(a[-1],m)
``` | instruction | 0 | 66,271 | 5 | 132,542 |
No | output | 1 | 66,271 | 5 | 132,543 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are N integers, A_1, A_2, ..., A_N, written on a blackboard.
We will repeat the following operation N-1 times so that we have only one integer on the blackboard.
* Choose two integers x and y on the blackboard and erase these two integers. Then, write a new integer x-y.
Find the maximum possible value of the final integer on the blackboard and a sequence of operations that maximizes the final integer.
Constraints
* 2 \leq N \leq 10^5
* -10^4 \leq A_i \leq 10^4
* All values in input are integers.
Input
Input is given from Standard Input in the following format:
N
A_1 A_2 ... A_N
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Output
Print the maximum possible value M of the final integer on the blackboard, and a sequence of operations x_i, y_i that maximizes the final integer, in the format below.
Here x_i and y_i represent the integers x and y chosen in the i-th operation, respectively.
If there are multiple sequences of operations that maximize the final integer, any of them will be accepted.
M
x_1 y_1
:
x_{N-1} y_{N-1}
Examples
Input
3
1 -1 2
Output
4
-1 1
2 -2
Input
3
1 1 1
Output
1
1 1
1 0
Submitted Solution:
```
N = int(input())
A = list(map(int, input().split()))
A.sort()
ans = []
if N % 2 == 1:
ans.append((A[0], A[-1]))
A[0] -= A[-1]
A.pop()
B = []
for n, p in zip(A[:N // 2], A[N // 2:]):
B.append(n)
B.append(p)
now = B[0]
for b in B[1:]:
ans.append((b, now))
now = b - now
print(now)
for a in ans:
print(*a)
``` | instruction | 0 | 66,272 | 5 | 132,544 |
No | output | 1 | 66,272 | 5 | 132,545 |
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