Tasks Details
easy
1.
PermCheck
Check whether array A is a permutation.
Task Score
75%
Correctness
83%
Performance
66%
A non-empty array A consisting of N integers is given.
A permutation is a sequence containing each element from 1 to N once, and only once.
For example, array A such that:
A[0] = 4 A[1] = 1 A[2] = 3 A[3] = 2is a permutation, but array A such that:
A[0] = 4 A[1] = 1 A[2] = 3is not a permutation, because value 2 is missing.
The goal is to check whether array A is a permutation.
Write a function:
function solution(A);
that, given an array A, returns 1 if array A is a permutation and 0 if it is not.
For example, given array A such that:
A[0] = 4 A[1] = 1 A[2] = 3 A[3] = 2the function should return 1.
Given array A such that:
A[0] = 4 A[1] = 1 A[2] = 3the function should return 0.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..100,000];
- each element of array A is an integer within the range [1..1,000,000,000].
Copyright 2009–2024 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
Solution
Programming language used JavaScript
Total time used 7 minutes
Effective time used 7 minutes
Notes
not defined yet
Task timeline
Code: 13:41:00 UTC,
java,
autosave
Code: 13:47:00 UTC,
js,
verify,
result: Passed
Analysis
Code: 13:47:02 UTC,
js,
verify,
result: Passed
Analysis
Code: 13:47:04 UTC,
js,
final,
score: 
75
Analysis summary
The following issues have been detected: wrong answers.
Analysis
expand all
Correctness tests
1.
0.068 s
OK
2.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.072 s
OK
1.
0.068 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
4.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
permutations_of_ranges
permutations of sets like [2..100] for which the anwsers should be false
permutations of sets like [2..100] for which the anwsers should be false
✘
WRONG ANSWER
got 0 expected 1
got 0 expected 1
1.
0.068 s
OK
2.
0.068 s
OK
3.
0.068 s
WRONG ANSWER,
got 0 expected 1
expand all
Performance tests
1.
0.112 s
OK
2.
0.112 s
OK
1.
0.228 s
OK
2.
0.216 s
OK
1.
0.228 s
OK
2.
0.232 s
OK
1.
0.228 s
WRONG ANSWER,
got 0 expected 1
2.
0.228 s
OK
1.
0.068 s
OK
2.
0.108 s
OK
3.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
WRONG ANSWER,
got 0 expected 1
3.
0.112 s
WRONG ANSWER,
got 0 expected 1
4.
0.212 s
WRONG ANSWER,
got 0 expected 1
5.
0.224 s
WRONG ANSWER,
got 0 expected 1