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 19 minutes
Notes
not defined yet
Code: 05:10:44 UTC,
java,
autosave
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 10, 2, 5, 1, 8, 20 ]
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 10, 50, 5, 1 ]
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
ReferenceError: a is not defined at solution (solution.js:5:5) at solutionWrapper (/tmp/exec.js:402:28) at Promise.resolve.then (/tmp/exec.js:428:24) at <anonymous> at process._tickCallback (internal/process/next_tick.js:188:7) at Function.Module.runMain (module.js:686:11) at startup (bootstrap_node.js:187:16) at bootstrap_node.js:608:3
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
ReferenceError: a is not defined at solution (solution.js:5:5) at solutionWrapper (/tmp/exec.js:402:28) at Promise.resolve.then (/tmp/exec.js:428:24) at <anonymous> at process._tickCallback (internal/process/next_tick.js:188:7) at Function.Module.runMain (module.js:686:11) at startup (bootstrap_node.js:187:16) at bootstrap_node.js:608:3
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 1, 2, 5, 8, 10, 20 ]
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 1, 5, 10, 50 ]
Code: 05:22:43 UTC,
js,
verify,
result: Failed
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 1, 2, 5, 8, 10, 20 ] -1
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 1, 5, 10, 50 ] -1
expand all
User tests
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ -5, -4, -3, 0, 1, 3, 5 ] 0
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ -1, 0, 1, 2 ] 0
User test case 1:
[-3, -4, -5, 0, 1, 3, 5]
User test case 2:
[-1, 0, 1, 2]
Code: 05:23:03 UTC,
js,
autosave
Code: 05:23:06 UTC,
js,
verify,
result: Failed
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 1, 2, 5, 8, 10, 20 ] 0
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 1, 5, 10, 50 ] 0
expand all
User tests
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ -5, -4, -3, 0, 1, 3, 5 ] 4
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ -1, 0, 1, 2 ] 2
User test case 1:
[-3, -4, -5, 0, 1, 3, 5]
User test case 2:
[-1, 0, 1, 2]
Code: 05:23:28 UTC,
js,
autosave
Code: 05:23:44 UTC,
js,
autosave
Code: 05:23:54 UTC,
js,
autosave
Code: 05:24:25 UTC,
js,
autosave
Code: 05:24:31 UTC,
js,
verify,
result: Failed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
A.sort((a,b) => a-b)
let positiviePos = A.findIndex(e => e > 0)-1
let positiveSlice = A.slice(positiviePos, A.length)
console.log(positiveSlice)
// for( let i = 0; i < A.length-2; i++){
// }
}
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 20 ]
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 50 ]
expand all
User tests
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 0, 1, 3, 5 ]
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
[ 0, 1, 2 ]
User test case 1:
[-3, -4, -5, 0, 1, 3, 5]
User test case 2:
[-1, 0, 1, 2]
Code: 05:25:35 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
A.sort((a,b) => a-b)
conso
let positiviePos = A.findIndex(e => e > 0)-1
let positiveSlice = A.slice(positiviePos, A.length)
console.log(positiveSlice)
// for( let i = 0; i < A.length-2; i++){
// }
}
Code: 05:25:38 UTC,
js,
verify,
result: Failed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
A.sort((a,b) => a-b)
console.log(A.findIndex(e => e > 0))
let positiviePos = A.findIndex(e => e > 0)-1
let positiveSlice = A.slice(positiviePos, A.length)
console.log(positiveSlice)
// for( let i = 0; i < A.length-2; i++){
// }
}
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
0 [ 20 ]
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
0 [ 50 ]
expand all
User tests
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
4 [ 0, 1, 3, 5 ]
1.
0.076 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Invalid result type, integer expected, 'undefined' found Perhaps you are missing a 'return'?stdout:
2 [ 0, 1, 2 ]
User test case 1:
[-3, -4, -5, 0, 1, 3, 5]
User test case 2:
[-1, 0, 1, 2]
Code: 05:27:39 UTC,
js,
autosave
Code: 05:27:40 UTC,
js,
verify,
result: Passed
Analysis
User test case 1:
[-3, -4, -5, 0, 1, 3, 5]
User test case 2:
[-1, 0, 1, 2]
Code: 05:27:57 UTC,
js,
verify,
result: Passed
Analysis
User test case 1:
[-3, -4, -5, 0, 1, 3, 5, 7]
User test case 2:
[-1, 0, 1, 2]
Code: 05:28:13 UTC,
js,
autosave
Code: 05:28:13 UTC,
js,
verify,
result: Passed
Analysis
User test case 1:
[-3, -4, -5, 0, 1, 3, 5, 7]
User test case 2:
[-1, 0, 1, 2, 3]
Code: 05:28:26 UTC,
js,
verify,
result: Passed
Analysis
User test case 1:
[-3, -4, -5, 0, 1, 3, 5, 7]
User test case 2:
[-1, 0, 1, 2, 3, 4]
Code: 05:29:14 UTC,
js,
verify,
result: Passed
Analysis
User test case 1:
[-3, -4, -5, 0, 1, 3, 5, 7]
User test case 2:
[-1, 0, 1, 2, 3, 4]
Code: 05:29:17 UTC,
js,
final,
score: 
100
Analysis summary
The solution obtained perfect score.
Analysis
Detected time complexity:
O(N*log(N))
expand all
Correctness tests
1.
0.072 s
OK
2.
0.072 s
OK
3.
0.076 s
OK
4.
0.072 s
OK
5.
0.068 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.
0.072 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.
0.072 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.
0.072 s
OK
4.
0.072 s
OK
5.
0.072 s
OK
6.
0.068 s
OK
1.
0.072 s
OK
2.
0.072 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.
0.072 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
expand all
Performance tests
1.
0.120 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.
0.152 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.
0.208 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
4.
0.068 s
OK
5.
0.072 s
OK
6.
0.072 s
OK
1.
0.216 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.
0.152 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.
0.116 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