Test results - Codility

Tasks Details

easy

1. Dominator

Find an index of an array such that its value occurs at more than half of indices in the array.

Task Score

100%

Correctness

100%

Performance

100%

An array A consisting of N integers is given. The dominator of array A is the value that occurs in more than half of the elements of A.

For example, consider array A such that

A[0] = 3 A[1] = 4 A[2] = 3 A[3] = 2 A[4] = 3 A[5] = -1 A[6] = 3 A[7] = 3

The dominator of A is 3 because it occurs in 5 out of 8 elements of A (namely in those with indices 0, 2, 4, 6 and 7) and 5 is more than a half of 8.

Write a function

function solution(A);

that, given an array A consisting of N integers, returns index of any element of array A in which the dominator of A occurs. The function should return −1 if array A does not have a dominator.

For example, given array A such that

A[0] = 3 A[1] = 4 A[2] = 3 A[3] = 2 A[4] = 3 A[5] = -1 A[6] = 3 A[7] = 3

the function may return 0, 2, 4, 6 or 7, as explained above.

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 11 minutes

Notes

not defined yet

Code: 09:39:58 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: 09:40:01 UTC, js, autosave

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1 2 3 4 5 6

// 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: 09:40:23 UTC, js, autosave

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1 2 3 4 5 6 7

// 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: 09:40:53 UTC, js, autosave

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1 2 3 4 5 6 7 8

// 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 size = 0;
    for (let i = 0; i < A)
}

Code: 09:41:05 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11

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

Code: 09:41:35 UTC, js, autosave

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

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

Code: 09:42:05 UTC, js, autosave

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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 solution(A) {
    // write your code in JavaScript (Node.js 8.9.4)
    let size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !)
        }
    }
    
}

Code: 09:42:24 UTC, js, autosave

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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) {
    // write your code in JavaScript (Node.js 8.9.4)
    let size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            }
        }
    }
    
}

Code: 09:42:35 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    
}

Code: 09:43:00 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        
    }
    
}

Code: 09:43:41 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        cand
    }
    
}

Code: 09:43:51 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    
}

Code: 09:44:21 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count
}

Code: 09:44:31 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    for ()
}

Code: 09:45:02 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
}

Code: 09:45:32 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    if (count > (A.length / 2.0)) {
        lead
    }
}

Code: 09:45:42 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    if (count > (A.length / 2.0)) {
        leader = 
    }
}

Code: 09:46:12 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = 
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    if (count > (A.length / 2.0)) {
        leader = 
    }
}

Code: 09:46:42 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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
        }
    }
    if (count > (A.length / 2.0)) {
        leader = 
    }
}

Code: 09:46:53 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        leader = 
    }
}

Code: 09:47:23 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:47:54 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

// 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)
    i
    let size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:48:05 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Analysis

expand all Example tests

▶

example
example test

✔

0.072 s

Code: 09:48:12 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

User test case 1:

[]

Analysis

expand all Example tests

▶

example
example test

✔

0.068 s

expand all User tests

▶

test_data1

✔

0.068 s

OK
function result: -1

Code: 09:48:19 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

User test case 1:

[]

User test case 2:

[1]

Analysis

expand all Example tests

▶

example
example test

✔

0.072 s

expand all User tests

▶

test_data1

✔

0.072 s

OK
function result: -1

▶

test_data2

✔

0.072 s

OK
function result: 0

Code: 09:48:24 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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:48:32 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

User test case 1:

[]

User test case 2:

[1]

User test case 3:

[1, 2, 2, 2, 3]

Analysis

expand all Example tests

▶

example
example test

✔

0.068 s

expand all User tests

▶

test_data1

✔

0.068 s

OK
function result: -1

▶

test_data2

✔

0.072 s

OK
function result: 0

▶

test_data3

✔

0.072 s

OK
function result: 1

Code: 09:48:49 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) {
    // write your code in JavaScript (Node.js 8.9.4)
    let size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:48:51 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) {
    // write your code in JavaScript (Node.js 8.9.4)
    let size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

User test case 1:

[]

User test case 2:

[1]

User test case 3:

[1, 2, 2, 2, 3]

User test case 4:

[1, 2, 2, 2, 3, 4]

Analysis

expand all Example tests

▶

example
example test

✔

0.080 s

expand all User tests

▶

test_data1

✔

0.076 s

OK
function result: -1

▶

test_data2

✔

0.076 s

OK
function result: 0

▶

test_data3

✔

0.072 s

OK
function result: 1

▶

test_data4

✔

0.072 s

OK
function result: -1

Code: 09:49:30 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:49:42 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:49:47 UTC, js, verify, result: Passed

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

User test case 1:

[]

User test case 2:

[1]

User test case 3:

[1, 2, 2, 2, 3]

User test case 4:

[1, 2, 2, 2, 3, 4]

User test case 5:

[2147483647, 2147483647, 2147483647]

Analysis

expand all Example tests

▶

example
example test

✔

0.072 s

expand all User tests

▶

test_data1

✔

0.072 s

OK
function result: -1

▶

test_data2

✔

0.072 s

OK
function result: 0

▶

test_data3

✔

0.072 s

OK
function result: 1

▶

test_data4

✔

0.076 s

OK
function result: -1

▶

test_data5

✔

0.072 s

OK
function result: 0

Code: 09:50:03 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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:50:20 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Code: 09:50:24 UTC, js, verify, result: Passed

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

User test case 1:

[]

User test case 2:

[1]

User test case 3:

[1, 2, 2, 2, 3]

User test case 4:

[1, 2, 2, 2, 3, 4]

User test case 5:

[2147483647, 2147483647, 2147483647]

User test case 6:

[1, -2147483648, 2, 1, -2147483648, -2147483648, -2147483648]

Analysis

expand all Example tests

▶

example
example test

✔

0.068 s

expand all User tests

▶

test_data1

✔

0.068 s

OK
function result: -1

▶

test_data2

✔

0.068 s

OK
function result: 0

▶

test_data3

✔

0.068 s

OK
function result: 1

▶

test_data4

✔

0.072 s

OK
function result: -1

▶

test_data5

✔

0.068 s

OK
function result: 0

▶

test_data6

✔

0.068 s

OK
function result: 1

Code: 09:50:44 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

User test case 1:

[]

User test case 2:

[1]

User test case 3:

[1, 2, 2, 2, 3]

User test case 4:

[1, 2, 2, 2, 3, 4]

User test case 5:

[2147483647, 2147483647, 2147483647]

User test case 6:

[1, -2147483648, 2, 1, -2147483648, -2147483648, -2147483648]

Analysis

expand all Example tests

▶

example
example test

✔

0.076 s

expand all User tests

▶

test_data1

✔

0.076 s

OK
function result: -1

▶

test_data2

✔

0.096 s

OK
function result: 0

▶

test_data3

✔

0.116 s

OK
function result: 1

▶

test_data4

✔

0.120 s

OK
function result: -1

▶

test_data5

✔

0.112 s

OK
function result: 0

▶

test_data6

✔

0.112 s

OK
function result: 1

Code: 09:50:47 UTC, js, final, score: 100

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

// 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 size = 0;
    let value = null;
    for (let i = 0; i < A.length; i++) {
        if (size === 0) {
            size++;
            value = A[i];
        } else {
            if (value !== A[i]) {
                size--;
            } else {
                size++;
            }
        }
    }
    let candidate = -1;
    if (size > 0) {
        candidate = value;
    }
    let leader = -1;
    let count = 0;
    let index = null;
    for (let i = 0; i < A.length; i++) {
        if (A[i] === candidate) {
            count++;
            if (index === null) {
                index = i;
            }
        }
    }
    if (count > (A.length / 2.0)) {
        return index;
    }
    return -1
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N*log(N)) or O(N)

expand all Example tests

▶

example
example test

✔

0.068 s

expand all Correctness tests

▶

small_nondominator
all different and all the same elements

✔

0.068 s

▶

small_half_positions
half elements the same, and half + 1 elements the same

✔

0.068 s

▶

small
small test

✔

0.068 s

▶

small_pyramid
decreasing and plateau, small

✔

0.068 s

▶

extreme_empty_and_single_item
empty and single element arrays

✔

0.068 s

▶

extreme_half1
array with exactly N/2 values 1, N even + [0,0,1,1,1]

✔

0.068 s

▶

extreme_half2
array with exactly floor(N/2) values 1, N odd + [0,0,1,1,1]

✔

0.068 s

▶

extreme_half3
array with exactly ceil(N/2) values 1 + [0,0,1,1,1]

✔

0.068 s

expand all Performance tests

▶

medium_pyramid
decreasing and plateau, medium

✔

0.084 s

▶

large_pyramid
decreasing and plateau, large

✔

0.112 s

▶

medium_random
random test with dominator, N = 10,000

✔

0.080 s

▶

large_random
random test with dominator, N = 100,000

✔

0.112 s