Test results - Codility

Tasks Details

easy

1. EquiLeader

Find the index S such that the leaders of the sequences A[0], A[1], ..., A[S] and A[S + 1], A[S + 2], ..., A[N - 1] are the same.

Task Score

100%

Correctness

100%

Performance

100%

A non-empty array A consisting of N integers is given.

The leader of this array is the value that occurs in more than half of the elements of A.

An equi leader is an index S such that 0 ≤ S < N − 1 and two sequences A[0], A[1], ..., A[S] and A[S + 1], A[S + 2], ..., A[N − 1] have leaders of the same value.

For example, given array A such that:

A[0] = 4 A[1] = 3 A[2] = 4 A[3] = 4 A[4] = 4 A[5] = 2

we can find two equi leaders:

0, because sequences: (4) and (3, 4, 4, 4, 2) have the same leader, whose value is 4.

2, because sequences: (4, 3, 4) and (4, 4, 2) have the same leader, whose value is 4.

The goal is to count the number of equi leaders.

Write a function:

function solution(A);

that, given a non-empty array A consisting of N integers, returns the number of equi leaders.

For example, given:

A[0] = 4 A[1] = 3 A[2] = 4 A[3] = 4 A[4] = 4 A[5] = 2

the function should return 2, as explained above.

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 17 minutes

Notes

not defined yet

Code: 10:03:39 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: 10:03:44 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: 10:07:42 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: 10:08:14 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;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }
    if (stack.length > 0) {
        const candidate = stack.pop();
        const minCount = Math.floor(N / 2) + 1;

        let count = 0;
        for (let i = 0; i < N; i++) {
            if (A[i] === candidate) {
                count++;

                if (count >= minCount) {
                    return i;
                }
            }
        }
    }
    
    return -1;
}

Code: 10:08:29 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }
    if (stack.length > 0) {
        const candidate = stack.pop();
        const minCount = Math.floor(N / 2) + 1;

        let count = 0;
        for (let i = 0; i < N; i++) {
            if (A[i] === candidate) {
                count++;

                if (count >= minCount) {
                    return i;
                }
            }
        }
    }
    
    return -1;
}

Code: 10:08:56 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const candidate = stack.pop();
    const minCount = Math.floor(N / 2) + 1;

    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === candidate) {
            count++;

            if (count >= minCount) {
                return i;
            }
        }
    }
    
    return -1;
}

Code: 10:09:42 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const candidate = stack.pop();
    const minCount = Math.floor(N / 2) + 1;

    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === candidate) {
            count++;

        }
    }
    
    return -1;
}

Code: 10:09:56 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    
    return -1;
}

Code: 10:10:06 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    
    //
}

Code: 10:10:24 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    
    // search for equi leaders
    for (let i = 0)
}

Code: 10:11:15 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    
    // search for equi leaders
    for (let i = 0; i <)
}

Code: 10:11:45 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === candidate) {
            count++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i])
    }
}

Code: 10:11:56 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let count = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            count++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] ===)
    }
}

Code: 10:12:26 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    let r
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
        }
    }
}

Code: 10:12:57 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount)
    }
}

Code: 10:13:15 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor())
    }
}

Code: 10:13:26 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1)
    }
}

Code: 10:13:50 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor(N - i))
    }
}

Code: 10:14:03 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {
                
            }
    }
}

Code: 10:14:16 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    const equiLeaders = [];

    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {

            }
    }
}

Code: 10:14:28 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    const equiLeaders = [];

    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {
                equiLeaders.push(i);
            }
    }

    return equiLeaders
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, 'object' found

Code: 10:14:42 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    const equiLeaders = [];

    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {
                equiLeaders.push(i);
            }
    }

    console.log(equiLeaders)

    return equiLeaders
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, 'object' found

stdout:

[ 1 ]

Code: 10:14:51 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    const equiLeader = [];

    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {
                equiLeaders.push(i);
            }
    }

    console.log(equiLeaders)

    return equiLeaders
}

Code: 10:15:04 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    const equiLeaderCount = 0;

    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

TypeError: Assignment to constant variable.
    at solution (solution.js:38:32)
    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: 10:15:11 UTC, js, verify, result: Failed

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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 1 expected 2

0.072 s

WRONG ANSWER, got 1 expected 2

Code: 10:16:00 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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i - 1) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Code: 10:16:01 UTC, js, verify, result: Failed

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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i - 1) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 3 expected 2

0.072 s

WRONG ANSWER, got 3 expected 2

Code: 10:16:11 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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Code: 10:16:43 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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N -- i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Code: 10:16:49 UTC, js, verify, result: Failed

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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }

        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 3 expected 2

0.072 s

WRONG ANSWER, got 3 expected 2

Code: 10:17:14 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 40 41 42 43 44

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        console.log(leftLeaderCount);
        console.log(rightLeaderCount);
        console.log()
        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Code: 10:17:26 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 40 41 42 43 44 45

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        console.log(leftLeaderCount);
        console.log(rightLeaderCount);
        console.log(Math.floor(i / 2) + 1)
        console.log()
        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Code: 10:17:42 UTC, js, verify, result: Failed

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 40 41 42 43 44 45 46

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        console.log('-----------')
        console.log(leftLeaderCount);
        console.log(Math.floor(i / 2) + 1)
        console.log(rightLeaderCount);
        console.log(Math.floor((N - 1 - i) / 2) + 1)
        if (leftLeaderCount >= Math.floor(i / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 3 expected 2

0.076 s

WRONG ANSWER, got 3 expected 2

stdout:

-----------
1
1
3
3
-----------
1
1
3
3
-----------
2
2
2
2
-----------
3
2
1
2
-----------
4
3
0
1
-----------
4
3
0
1

Code: 10:18:50 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 40 41 42 43 44 45 46

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        console.log('-----------')
        console.log(leftLeaderCount);
        console.log(Math.floor(i / 2) + 1)
        console.log(rightLeaderCount);
        console.log(Math.floor((N - 1 - i) / 2) + 1)
        if (leftLeaderCount >= Math.floor(i + / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Code: 10:18:52 UTC, js, verify, result: Failed

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 40 41 42 43 44 45 46

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        console.log('-----------')
        console.log(leftLeaderCount);
        console.log(Math.floor(i / 2) + 1)
        console.log(rightLeaderCount);
        console.log(Math.floor((N - 1 - i) / 2) + 1)
        if (leftLeaderCount >= Math.floor(i + 1 / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 1 expected 2

0.076 s

WRONG ANSWER, got 1 expected 2

stdout:

-----------
1
1
3
3
-----------
1
1
3
3
-----------
2
2
2
2
-----------
3
2
1
2
-----------
4
3
0
1
-----------
4
3
0
1

Code: 10:19:16 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 40 41 42 43 44 45 46

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        console.log('-----------')
        console.log(leftLeaderCount);
        console.log(Math.floor((i + 1) / 2) + 1)
        console.log(rightLeaderCount);
        console.log(Math.floor((N - 1 - i) / 2) + 1)
        if (leftLeaderCount >= Math.floor(i + 1 / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Code: 10:19:19 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 40 41 42 43 44 45 46

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        console.log('-----------')
        console.log(leftLeaderCount);
        console.log(Math.floor((i + 1) / 2) + 1)
        console.log(rightLeaderCount);
        console.log(Math.floor((N - 1 - i) / 2) + 1)
        if (leftLeaderCount >= Math.floor((i + 1) / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✔

0.076 s

stdout:

-----------
1
1
3
3
-----------
1
2
3
3
-----------
2
2
2
2
-----------
3
3
1
2
-----------
4
3
0
1
-----------
4
4
0
1

Code: 10:19:29 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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        
        if (leftLeaderCount >= Math.floor((i + 1) / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✔

0.072 s

Code: 10:19:35 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 40 41 42

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

function solution(A) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        
        if (leftLeaderCount >= Math.floor((i + 1) / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis

expand all Example tests

▶

example
example test

✔

0.072 s

Code: 10:19:38 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) {
    // find the leader of the orignal array
    const N = A.length;
    const stack = [];

    for (let i = 0; i < N; i++) {
        if (stack.length === 0 || stack[stack.length - 1] === A[i]) {
            stack.push(A[i]);
        } else {
            stack.pop();
        }
    }

    const leader = stack.pop();
    let totalLeaderCount = 0;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            totalLeaderCount++;
        }
    }
    
    // search for equi leaders
    let equiLeaderCount = 0;
    let leftLeaderCount = 0;
    let rightLeaderCount = totalLeaderCount;
    for (let i = 0; i < N; i++) {
        if (A[i] === leader) {
            leftLeaderCount++;
            rightLeaderCount--;
        }
        
        if (leftLeaderCount >= Math.floor((i + 1) / 2) + 1 &&
            rightLeaderCount >= Math.floor((N - 1 - i) / 2) + 1) {
                equiLeaderCount++;
            }
    }

    return equiLeaderCount;
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N)

expand all Example tests

▶

example
example test

✔

0.068 s

expand all Correctness tests

▶

single
single element

✔

0.068 s

▶

double
two elements

✔

0.068 s

▶

simple
simple test

✔

0.068 s

▶

small_random
small random test with two values, length = ~100

✔

0.068 s

▶

small
random + 200 * [MIN_INT] + random ,length = ~300

✔

0.072 s

expand all Performance tests

▶

large_random
large random test with two values, length = ~50,000

✔

0.100 s

▶

large
random(0,1) + 50000 * [0] + random(0, 1), length = ~100,000

✔

0.104 s

▶

large_range
1, 2, ..., N, length = ~100,000

✔

0.124 s

0.068 s

▶

extreme_large
all the same values

✔

0.116 s