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Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya is a beginner programmer. He has already mastered the basics of the C++ language and moved on to learning algorithms. The first algorithm he encountered was insertion sort. Petya has alrea...
instruction
0
71,085
12
142,170
No
output
1
71,085
12
142,171
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya is a beginner programmer. He has already mastered the basics of the C++ language and moved on to learning algorithms. The first algorithm he encountered was insertion sort. Petya has alrea...
instruction
0
71,086
12
142,172
No
output
1
71,086
12
142,173
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,217
12
142,434
Tags: constructive algorithms Correct Solution: ``` n = int(input()) r = list(range(n)) a, b = r[2 - n % 2::2], r[1 + n % 2::2] print(' '.join(map(str, a + [n] + a[::-1] + b + b[::-1] + [n]))) ```
output
1
71,217
12
142,435
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,218
12
142,436
Tags: constructive algorithms Correct Solution: ``` import collections import math n = int(input()) arr = [0] * (2 * n) l, r = 0, 0 for i in range(1, n): if i % 2 == 1: arr[l] = arr[l + n - i] = i l += 1 else: arr[n + r] = arr[n + r + n - i] = i r += 1 for i in range(2): wh...
output
1
71,218
12
142,437
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,219
12
142,438
Tags: constructive algorithms Correct Solution: ``` # [https://codeforces.com/contest/622/submission/15939479] n = int(input()) A = [0] * (2*n) per1 = 0 per2 = n for i in range(1, n): if i % 2==1: A[per1] = i A[per1+n-i] = i per1+=1 else: A[per2] = i A[per2+n-i] = i ...
output
1
71,219
12
142,439
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,220
12
142,440
Tags: constructive algorithms Correct Solution: ``` from sys import stdin, stdout, setrecursionlimit input = stdin.readline # setrecursionlimit(int(1e6)) inf = float('inf') from functools import cmp_to_key from collections import defaultdict as dd from collections import Counter, deque from heapq import * import math f...
output
1
71,220
12
142,441
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,221
12
142,442
Tags: constructive algorithms Correct Solution: ``` n = int(input()) a = [] for i in range(1 + n % 2, n, 2): a.append(i) for i in range(n // 2): a.append(a[-(2 * i + 1)]) for i in range(1 + (n % 2 ^ 1), n, 2): a.append(i) a.append(n) for i in range((n - 1) // 2): a.append(a[-(2 * i + 2)]) a.append(n) pr...
output
1
71,221
12
142,443
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,222
12
142,444
Tags: constructive algorithms Correct Solution: ``` #!/usr/bin/env python3 def make_seq(n): os = list(range(1, n, 2)) es = list(range(2, n, 2)) ls = os[:] if n % 2 != 0: ls += [n] ls += os[::-1] ls += [n] ls += es if n % 2 == 0: ls += [n] ls += es[::-1] return l...
output
1
71,222
12
142,445
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,223
12
142,446
Tags: constructive algorithms Correct Solution: ``` n=int(input()) if n%2==0: a=[] for i in range(1,n,2): a.append(i) a=a+a[::-1] b=[] for i in range(2,n,2): b.append(i) a=a+[n]+b+[n]+b[::-1] print(*a) else: a=[] for i in range(1,n,2): a.append(i) a=a+[n]+...
output
1
71,223
12
142,447
Provide tags and a correct Python 3 solution for this coding contest problem. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define the value di = yi - xi β€” the distance between the...
instruction
0
71,224
12
142,448
Tags: constructive algorithms Correct Solution: ``` import sys n = int(input()) a = [n]*(n*2) def solve(i, x): if x == 0: return i if (n - x) & 1: for num in range((1 if x & 1 else 2), x+1, 2): a[i] = num i += 1 for num in range(x, 0, -2): a[i] = nu...
output
1
71,224
12
142,449
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,225
12
142,450
Yes
output
1
71,225
12
142,451
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,226
12
142,452
Yes
output
1
71,226
12
142,453
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,227
12
142,454
Yes
output
1
71,227
12
142,455
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,228
12
142,456
Yes
output
1
71,228
12
142,457
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,229
12
142,458
No
output
1
71,229
12
142,459
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,230
12
142,460
No
output
1
71,230
12
142,461
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,231
12
142,462
No
output
1
71,231
12
142,463
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) in the permuted array a. Let's define th...
instruction
0
71,232
12
142,464
No
output
1
71,232
12
142,465
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,293
12
142,586
Tags: implementation Correct Solution: ``` n=int(input()) s=list(map(int, input().split())) i=0 a=0 while i<n and s[i]>a: a=s[i] i+=1 while i<n and s[i]==a: i+=1 while i<n and s[i]<a: a=s[i] i+=1 if i==n: print("YES") else: print("NO") ```
output
1
71,293
12
142,587
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,294
12
142,588
Tags: implementation Correct Solution: ``` def int_map(): return map(int, input().split(' ')) n = int(input()) if n == 1: print('YES') exit() v, r, u = False, False, False a = list(int_map()) a.append(0) i = 0 while a[i] < a[i+1] and i < n - 1: i += 1 while a[i] == a[i+1] and i < n - 1: i += 1 while a[i] > a...
output
1
71,294
12
142,589
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,295
12
142,590
Tags: implementation Correct Solution: ``` def main(): read = lambda: tuple(map(int, input().split())) n = read()[0] l = read() if len(l) == 1: return "YES" lv = l[0] ss = [] for v in l[1:]: state = "inc" if v > lv else "dec" if v < lv else "norm" if len(ss) ...
output
1
71,295
12
142,591
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,296
12
142,592
Tags: implementation Correct Solution: ``` n = int(input()) a = [int(x) for x in input().split(' ')] m = 'YES' s = 0 v = 0 for i in range(n): if s == 0: if v >= a[i]: s = 1 if s == 1: if v < a[i]: m = 'NO' break elif v > a[i]: s = 2 if...
output
1
71,296
12
142,593
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,297
12
142,594
Tags: implementation Correct Solution: ``` import sys n = int(sys.stdin.readline()) array = [int(i) for i in sys.stdin.readline().split()] state = 0 good = True last = array[0] for i in array[1:]: if last < i : #increasing if state > 0 : good = False break elif l...
output
1
71,297
12
142,595
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,298
12
142,596
Tags: implementation Correct Solution: ``` #!/usr/bin/env python3 from sys import stdin, stdout def rint(): return map(int, stdin.readline().split()) #lines = stdin.readlines() n = int(input()) a = list(rint()) if n == 1: print("YES") exit() stage = 0 for i in range(n-1): diff = a[i+1] - a[i] i...
output
1
71,298
12
142,597
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,299
12
142,598
Tags: implementation Correct Solution: ``` num, arr = int(input()), input().split() arr = [int(x) for x in arr] def problem8(num,arr): i = 1 for i in range(i, num): if not (arr[i - 1] < arr[i]): break else: return "YES" for i in range(i, num): if not (arr[i - 1] ==...
output
1
71,299
12
142,599
Provide tags and a correct Python 3 solution for this coding contest problem. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) and the last block (decreasing) may be absent. It...
instruction
0
71,300
12
142,600
Tags: implementation Correct Solution: ``` import itertools as it sign = lambda x: (x > 0) - (x < 0) n, arr = input(), [int(x) for x in input().split()] diff = (sign(a-b) for a, b in zip(arr, arr[1:])) diff = (set(g) for k, g in it.groupby(diff)) diff = list(it.chain.from_iterable(diff)) if all(a < b for a, b in zip(di...
output
1
71,300
12
142,601
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,301
12
142,602
Yes
output
1
71,301
12
142,603
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,302
12
142,604
Yes
output
1
71,302
12
142,605
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,303
12
142,606
Yes
output
1
71,303
12
142,607
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,304
12
142,608
Yes
output
1
71,304
12
142,609
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,305
12
142,610
No
output
1
71,305
12
142,611
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,306
12
142,612
No
output
1
71,306
12
142,613
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,307
12
142,614
No
output
1
71,307
12
142,615
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Array of integers is unimodal, if: * it is strictly increasing in the beginning; * after that it is constant; * after that it is strictly decreasing. The first block (increasing) an...
instruction
0
71,308
12
142,616
No
output
1
71,308
12
142,617
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,367
12
142,734
Tags: implementation Correct Solution: ``` n = int(input()) l = list(map(int, input().split())) s = '' d = {} cnt = 0 for i in range(len(l)-1, -1, -1): if l[i] not in d: s = str(l[i]) + ' ' + s d[l[i]] = i cnt += 1 print(cnt) print(s) ```
output
1
71,367
12
142,735
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,368
12
142,736
Tags: implementation Correct Solution: ``` n = input() l = list(map(int, input().split(" ") )) l = l[::-1] ans = [] for i in l: if i in ans: continue else: ans.append(i) ans = ans[::-1] print(len(ans)) print(*ans) ```
output
1
71,368
12
142,737
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,369
12
142,738
Tags: implementation Correct Solution: ``` n = int(input()) l = input().split() l.reverse() temp = [] for i in l: if i not in temp: temp.append(i) print(len(temp)) print(" ".join(temp[::-1])) ```
output
1
71,369
12
142,739
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,370
12
142,740
Tags: implementation Correct Solution: ``` n = int(input()) ar = list(map(int, input().split())) dic = {} ar.reverse() nar = [] for x in ar: if dic.get(x) is None: nar.append(x) dic[x] = True nar.reverse() print(len(nar)) print(*nar) ```
output
1
71,370
12
142,741
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,371
12
142,742
Tags: implementation Correct Solution: ``` n = int(input()) a = list(map(int, input().split())) ans = [] for i in range(n): if a[i] not in a[i+1:]: ans.append(a[i]) print(len(ans)) print(*ans, sep=" ") ```
output
1
71,371
12
142,743
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,372
12
142,744
Tags: implementation Correct Solution: ``` n=int(input()) li=list(map(int,input().split())) s=[] for i in range(n): if li[n-1-i] not in s: s.append(li[n-1-i]) n=len(s) print(n) for i in range(n): print(s[n-1-i],end=" ") ```
output
1
71,372
12
142,745
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,373
12
142,746
Tags: implementation Correct Solution: ``` n = int(input()) a = list(map(int, input().split())) a.reverse() l = [] d = {} for i in a: if i not in d: l.append(str(i)) d[i]=1 print(len(l)) l.reverse() print(" ".join(l)) ```
output
1
71,373
12
142,747
Provide tags and a correct Python 3 solution for this coding contest problem. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements shou...
instruction
0
71,374
12
142,748
Tags: implementation Correct Solution: ``` """ CODEFORCES user: julianloaiza1999 problem Restoring Three numbers """ import sys from sys import stdin def main(): N = int(stdin.readline()) A = [int(x) for x in stdin.readline().strip().split()] R = set() i = N-1 while(i >= 0): if A[i] in R: A.pop(i) else: ...
output
1
71,374
12
142,749
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,375
12
142,750
Yes
output
1
71,375
12
142,751
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,376
12
142,752
Yes
output
1
71,376
12
142,753
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,377
12
142,754
Yes
output
1
71,377
12
142,755
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,378
12
142,756
Yes
output
1
71,378
12
142,757
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,379
12
142,758
No
output
1
71,379
12
142,759
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,380
12
142,760
No
output
1
71,380
12
142,761
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,381
12
142,762
No
output
1
71,381
12
142,763
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Petya has an array a consisting of n integers. He wants to remove duplicate (equal) elements. Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relat...
instruction
0
71,382
12
142,764
No
output
1
71,382
12
142,765