Test results - Codility

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%

Task description

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] = 20

Triplet (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] = 20

the function should return 1, as explained above. Given array A such that:

A[0] = 10 A[1] = 50 A[2] = 5 A[3] = 1

the 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].

Solution

Programming language used JavaScript

Time spent on task 15 minutes

Notes

not defined yet

Task timeline

‌

Code: 18:58:21 UTC, java, autosave

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// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
    }
}

Code: 18:58:21 UTC, java, autosave

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// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
    }
}

Code: 18:58:32 UTC, js, autosave

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// 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)
}

Code: 18:59:41 UTC, js, autosave

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
    
}

Code: 19:09:40 UTC, js, autosave

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
    A
}

Code: 19:10:00 UTC, js, autosave

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
    A.sort();

    for (let i = 0; i < A.length; i++) {
        if ()
    }
}

Code: 19:10:30 UTC, js, autosave

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
    A.sort();
   
   
    for (let i = 0; i < A.length; i++) {
        
    }
}

Code: 19:10:47 UTC, js, autosave

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function isTriangular()

function solution(A) {
    A.sort();
   
   
    for (let i = 0; i < A.length; i++) {
        
    }
}

Code: 19:11:18 UTC, js, autosave

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function isTriangular(P, Q, R) {
    return P + Q > R && Q + R > P && R + P > Q;
}

function solution(A) {
    A.sort();
   
   
    for (let i = ; i < A.length; i++) {
        if (isTriangular)
    }
}

Code: 19:11:46 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function isTriangular(P, Q, R) {
    return P + Q > R && Q + R > P && R + P > Q;
}

function solution(A) {
    A.sort();
   
   
    for (let i = 0; i < A.length - 2; i++) {
        if (isTriangular(A[i], A[i + 1], A[i + 2]) {
            return 1 
        }
    }
}

Code: 19:11:56 UTC, js, verify, result: Failed

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function isTriangular(P, Q, R) {
    return P + Q > R && Q + R > P && R + P > Q;
}

function solution(A) {
    A.sort();
   
   
    for (let i = 0; i < A.length - 2; i++) {
        if (isTriangular(A[i], A[i + 1], A[i + 2])) {
            return 1;
        }
    }

    return 0;
}

Analysis

expand all Example tests

▶

example
example, positive answer, length=6

✘

WRONG ANSWER
got 0 expected 1

0.072 s

WRONG ANSWER, got 0 expected 1

▶

example1
example, answer is zero, length=4

✔

0.072 s

Code: 19:12:12 UTC, js, verify, result: Passed

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function isTriangular(P, Q, R) {
    return P + Q > R && Q + R > P && R + P > Q;
}

function solution(A) {
    A.sort((a, b) => b - a);
   
   
    for (let i = 0; i < A.length - 2; i++) {
        if (isTriangular(A[i], A[i + 1], A[i + 2])) {
            return 1;
        }
    }

    return 0;
}

Analysis

expand all Example tests

▶

example
example, positive answer, length=6

✔

0.072 s

▶

example1
example, answer is zero, length=4

✔

0.072 s

Code: 19:12:21 UTC, js, verify, result: Passed

show code in pop-up

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function isTriangular(P, Q, R) {
    return P + Q > R && Q + R > P && R + P > Q;
}

function solution(A) {
    A.sort((a, b) => b - a);
   
   
    for (let i = 0; i < A.length - 2; i++) {
        if (isTriangular(A[i], A[i + 1], A[i + 2])) {
            return 1;
        }
    }

    return 0;
}

Analysis

expand all Example tests

▶

example
example, positive answer, length=6

✔

0.072 s

▶

example1
example, answer is zero, length=4

✔

0.068 s

Code: 19:12:23 UTC, js, final, score: 100

show code in pop-up

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function isTriangular(P, Q, R) {
    return P + Q > R && Q + R > P && R + P > Q;
}

function solution(A) {
    A.sort((a, b) => b - a);
   
   
    for (let i = 0; i < A.length - 2; i++) {
        if (isTriangular(A[i], A[i + 1], A[i + 2])) {
            return 1;
        }
    }

    return 0;
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N*log(N))

expand all Example tests

▶

example
example, positive answer, length=6

✔

0.072 s

▶

example1
example, answer is zero, length=4

✔

0.072 s

expand all Correctness tests

▶

extreme_empty
empty sequence

✔

0.072 s

▶

extreme_single
1-element sequence

✔

0.072 s

▶

extreme_two_elems
2-element sequence

✔

0.072 s

▶

extreme_negative1
three equal negative numbers

✔

0.072 s

▶

extreme_arith_overflow1
overflow test, 3 MAXINTs

✔

0.072 s

▶

extreme_arith_overflow2
overflow test, 10 and 2 MININTs

✔

0.072 s

▶

extreme_arith_overflow3
overflow test, 0 and 2 MAXINTs

✔

0.072 s

▶

medium1
chaotic sequence of values from [0..100K], length=30

✔

0.072 s

▶

medium2
chaotic sequence of values from [0..1K], length=50

✔

0.072 s

▶

medium3
chaotic sequence of values from [0..1K], length=100

✔

0.072 s

expand all Performance tests

▶

large1
chaotic sequence with values from [0..100K], length=10K

✔

0.116 s

0.072 s

▶

large2
1 followed by an ascending sequence of ~50K elements from [0..100K], length=~50K

✔

0.156 s

0.072 s

▶

large_random
chaotic sequence of values from [0..1M], length=100K

✔

0.208 s

0.072 s

▶

large_negative
chaotic sequence of negative values from [-1M..-1], length=100K

✔

0.208 s

0.072 s

▶

large_negative2
chaotic sequence of negative values from [-10..-1], length=100K

✔

0.156 s

0.072 s

▶

large_negative3
sequence of -1 value, length=100K

✔

0.120 s

0.072 s