Test results - Codility

Tasks Details

medium

1. MinAbsSumOfTwo

Find the minimal absolute value of a sum of two elements.

Task Score

100%

Correctness

100%

Performance

100%

Let A be a non-empty array consisting of N integers.

The abs sum of two for a pair of indices (P, Q) is the absolute value |A[P] + A[Q]|, for 0 ≤ P ≤ Q < N.

For example, the following array A:

A[0] = 1 A[1] = 4 A[2] = -3

has pairs of indices (0, 0), (0, 1), (0, 2), (1, 1), (1, 2), (2, 2).
The abs sum of two for the pair (0, 0) is A[0] + A[0] = |1 + 1| = 2.
The abs sum of two for the pair (0, 1) is A[0] + A[1] = |1 + 4| = 5.
The abs sum of two for the pair (0, 2) is A[0] + A[2] = |1 + (−3)| = 2.
The abs sum of two for the pair (1, 1) is A[1] + A[1] = |4 + 4| = 8.
The abs sum of two for the pair (1, 2) is A[1] + A[2] = |4 + (−3)| = 1.
The abs sum of two for the pair (2, 2) is A[2] + A[2] = |(−3) + (−3)| = 6.

Write a function:

function solution(A);

that, given a non-empty array A consisting of N integers, returns the minimal abs sum of two for any pair of indices in this array.

For example, given the following array A:

A[0] = 1 A[1] = 4 A[2] = -3

the function should return 1, as explained above.

Given array A:

A[0] = -8 A[1] = 4 A[2] = 5 A[3] =-10 A[4] = 3

the function should return |(−8) + 5| = 3.

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 [−1,000,000,000..1,000,000,000].

Solution

Programming language used JavaScript

Time spent on task 18 minutes

Notes

not defined yet

Code: 07:16:16 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: 07:16:21 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: 07:17:34 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) {
    cons
}

Code: 07:17:45 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) {
    const N = A.length;

    
}

Code: 07:30:49 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) {
    const N = A.length;

    cons
}

Code: 07:31:10 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 solution(A) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    console.log(A);
}

Analysis

expand all Example tests

▶

example1
first example

✘

RUNTIME ERROR
tested program terminated with exit code 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, -3, 4 ]

▶

example2
second example

✘

RUNTIME ERROR
tested program terminated with exit code 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:

[ 3, 4, 5, -8, -10 ]

Code: 07:31:25 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10

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

function solution(A) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    fo
}

Code: 07:31:46 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) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Number.MAX_SAFE_INTEGER;
    for (let i = 0; i < N; i++) {
        
    }
}

Code: 07:31:56 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) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = A[]
    for (let i = 0; i < N; i++) {

    }
}

Code: 07:32:08 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) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = A[0] + A[0];
    for (let i = 0; i < N; i++) {

    }
}

Code: 07:32:34 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) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Math.abs(A[0] + A[0]);
    for (let i = 0; i < N - 1; i++) {
        const current = 
    }
}

Code: 07:33:04 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) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Math.abs(A[0] + A[0]);
    for (let i = 0; i < N - 1; i++) {
        const current = Math.abs(A[i] + A[i + 1])
    }
}

Code: 07:33:17 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 solution(A) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Math.abs(A[0] + A[0]);
    for (let i = 0; i < N - 1; i++) {
        const current = Math.abs(A[i] + A[i + 1]);

        if (current < min) {
            min = current;
        }
    }

    return current;
}

Analysis

expand all Example tests

▶

example1
first example

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.128 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

ReferenceError: current is not defined
    at solution (solution.js:18:5)
    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

▶

example2
second example

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.124 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

ReferenceError: current is not defined
    at solution (solution.js:18:5)
    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

Code: 07:33:26 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 solution(A) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Math.abs(A[0] + A[0]);
    for (let i = 0; i < N - 1; i++) {
        const current = Math.abs(A[i] + A[i + 1]);

        if (current < min) {
            min = current;
        }
    }

    return min;
}

Analysis

expand all Example tests

▶

example1
first example

✔

0.072 s

▶

example2
second example

✔

0.072 s

Code: 07:33:39 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 solution(A) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Math.abs(A[0] + A[0]);
    for (let i = 0; i < N - 1; i++) {
        const current = Math.abs(A[i] + A[i + 1]);

        if (current < min) {
            min = current;
        }
    }

    return min;
}

Analysis

expand all Example tests

▶

example1
first example

✔

0.072 s

▶

example2
second example

✔

0.072 s

Code: 07:33:42 UTC, js, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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

function solution(A) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Math.abs(A[0] + A[0]);
    for (let i = 0; i < N - 1; i++) {
        const current = Math.abs(A[i] + A[i + 1]);

        if (current < min) {
            min = current;
        }
    }

    return min;
}

Analysis

expand all Example tests

▶

example1
first example

✔

0.072 s

▶

example2
second example

✔

0.072 s

Code: 07:33:45 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 solution(A) {
    const N = A.length;

    A.sort((a, b) => Math.abs(a) - Math.abs(b));

    let min = Math.abs(A[0] + A[0]);
    for (let i = 0; i < N - 1; i++) {
        const current = Math.abs(A[i] + A[i + 1]);

        if (current < min) {
            min = current;
        }
    }

    return min;
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N * log(N))

expand all Example tests

▶

example1
first example

✔

0.072 s

▶

example2
second example

✔

0.072 s

expand all Correctness tests

▶

extreme_single
sequences of 1 elements

✔

0.072 s

▶

extreme_double
sequences of 2 elements

✔

0.072 s

▶

positive_small
only positive numbers

✔

0.072 s

▶

negative_small
only negative numbers

✔

0.072 s

expand all Performance tests

▶

random_small
random sequence, length = ~1000

✔

0.084 s

▶

random_medium
random sequence, length = ~10,000

✔

0.116 s

▶

arithmetic_medium
arithemtic sequence, length = ~10,000

✔

0.148 s

▶

random_large
random sequence, length = ~100,000

✔

0.228 s

▶

extreme_large
sequence of MAX_INT, length = ~100,000

✔

0.132 s

▶

arithmetic_large
arithmetic sequence, length = ~100,000

✔

0.236 s

▶

constant_distance
constant distance between all elements, length = 100,000

✔

0.236 s