Tasks Details
easy
1.
Triangle
Determine whether a triangle can be built from a given set of edges.
Task Score
100%
Correctness
100%
Performance
100%
An array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and:
- A[P] + A[Q] > A[R],
- A[Q] + A[R] > A[P],
- A[R] + A[P] > A[Q].
For example, consider array A such that:
A[0] = 10 A[1] = 2 A[2] = 5 A[3] = 1 A[4] = 8 A[5] = 20Triplet (0, 2, 4) is triangular.
Write a function:
function solution(A);
that, given an array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise.
For example, given array A such that:
A[0] = 10 A[1] = 2 A[2] = 5 A[3] = 1 A[4] = 8 A[5] = 20the function should return 1, as explained above. Given array A such that:
A[0] = 10 A[1] = 50 A[2] = 5 A[3] = 1the function should return 0.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [0..100,000];
- each element of array A is an integer within the range [−2,147,483,648..2,147,483,647].
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
Solution
Programming language used JavaScript
Time spent on task 1 minutes
Notes
not defined yet
Task timeline
Code: 01:47:05 UTC,
java,
autosave
Code: 01:47:12 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
// write your code in JavaScript (Node.js 8.9.4)
let result = 0;
A.sort((a,b)=> {return b-a})
for(let i=0; i<A.length-2; i++){
if(A[i+1]+A[i+2]>A[i] && A[i]+A[i+2]>A[i+1] && A[i+1]+A[i]>A[i+2]) return 1
}
return result
}
Code: 01:47:17 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
// write your code in JavaScript (Node.js 8.9.4)
let result = 0;
A.sort((a,b)=> {return b-a})
for(let i=0; i<A.length-2; i++){
if(A[i+1]+A[i+2]>A[i]) return 1
}
return result
}
Analysis
Code: 01:47:21 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
// write your code in JavaScript (Node.js 8.9.4)
let result = 0;
A.sort((a,b)=> {return b-a})
for(let i=0; i<A.length-2; i++){
if(A[i+1]+A[i+2]>A[i]) return 1
}
return result
}
Analysis
Code: 01:47:24 UTC,
js,
final,
score:
100
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
// write your code in JavaScript (Node.js 8.9.4)
let result = 0;
A.sort((a,b)=> {return b-a})
for(let i=0; i<A.length-2; i++){
if(A[i+1]+A[i+2]>A[i]) return 1
}
return result
}Analysis summary
The solution obtained perfect score.
Analysis
Detected time complexity:
O(N*log(N))
expand all
Correctness tests
1.
0.068 s
OK
2.
0.068 s
OK
3.
0.072 s
OK
4.
0.072 s
OK
5.
0.072 s
OK
6.
0.072 s
OK
1.
0.072 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
4.
0.072 s
OK
5.
0.072 s
OK
6.
0.072 s
OK
1.
0.072 s
OK
2.
0.072 s
OK
3.
0.068 s
OK
4.
0.068 s
OK
5.
0.072 s
OK
6.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
3.
0.072 s
OK
4.
0.072 s
OK
5.
0.068 s
OK
6.
0.068 s
OK
1.
0.072 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.072 s
OK
5.
0.072 s
OK
6.
0.068 s
OK
1.
0.072 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.072 s
OK
5.
0.072 s
OK
6.
0.072 s
OK
1.
0.072 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
4.
0.072 s
OK
5.
0.068 s
OK
6.
0.072 s
OK
1.
0.072 s
OK
2.
0.068 s
OK
3.
0.072 s
OK
4.
0.072 s
OK
5.
0.068 s
OK
6.
0.068 s
OK
1.
0.072 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.068 s
OK
5.
0.068 s
OK
6.
0.068 s
OK
1.
0.072 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.068 s
OK
5.
0.068 s
OK
6.
0.068 s
OK
expand all
Performance tests
1.
0.112 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
4.
0.068 s
OK
5.
0.068 s
OK
6.
0.072 s
OK
1.
0.156 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
4.
0.072 s
OK
5.
0.076 s
OK
6.
0.068 s
OK
1.
0.204 s
OK
2.
0.072 s
OK
3.
0.068 s
OK
4.
0.068 s
OK
5.
0.072 s
OK
6.
0.068 s
OK
1.
0.208 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.068 s
OK
5.
0.068 s
OK
6.
0.068 s
OK
1.
0.156 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
4.
0.072 s
OK
5.
0.072 s
OK
6.
0.068 s
OK
1.
0.120 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.072 s
OK
5.
0.068 s
OK
6.
0.072 s
OK