Test results - Codility

Tasks Details

easy

1. PermMissingElem

Find the missing element in a given permutation.

Task Score

100%

Correctness

100%

Performance

100%

An array A consisting of N different integers is given. The array contains integers in the range [1..(N + 1)], which means that exactly one element is missing.

Your goal is to find that missing element.

Write a function:

function solution(A);

that, given an array A, returns the value of the missing element.

For example, given array A such that:

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

the function should return 4, as it is the missing element.

Write an efficient algorithm for the following assumptions:

N is an integer within the range [0..100,000];

the elements of A are all distinct;

each element of array A is an integer within the range [1..(N + 1)].

Solution

Programming language used JavaScript

Time spent on task 23 minutes

Notes

not defined yet

Code: 08:59:54 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) {
        // Implement your solution here
    }
}

Code: 09:05:21 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) {
    // Implement your solution here
}

Code: 09:08:35 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: 09:12:55 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) {
    for 
}

Code: 09:13:04 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) {
    for (num of A) {
        
    }
}

Code: 09:13:14 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) {
    for (num of A) {
        A.length
    }
}

Code: 09:13:36 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) {
    for (let i = 0; i < A.length; i++) {
        
    }
}

Code: 09:13:47 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) {
    let 
    
    for (let i = 0; i < A.length; i++) {
        
    }
}

Code: 09:14:08 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

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

    
}

Code: 09:14:24 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

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

    Math.sum(A)
}

Code: 09:14:32 UTC, js, verify, result: Failed

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

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

function solution(A) {
    let sum = 0;

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

    return sum - Math.sum(A);
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.056 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

TypeError: Math.sum is not a function
    at solution (solution.js:11:23)
    at solutionWrapper (/tmp/exec_user_sfwa0i_a/exec.js:402:28)
    at /tmp/exec_user_sfwa0i_a/exec.js:428:24

Code: 09:14:54 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

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

    return sum - Math.sum()
}

Code: 09:15:10 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

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

    Math.sum

    return sum - Math.sum()
}

Code: 09:15:30 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

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

    Math.sum

    return sum - Math.sum()
}

Code: 09:15:41 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

    for (let i = 1; i < A.length; i++) {
        sum += i;
    }

    Math.sum

    return sum - Math.sum()
}

Code: 09:15:53 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    Math.sum

    return sum - Math.sum()
}

Code: 09:16:23 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }



    return sum - A.sum;
}

Code: 09:16:25 UTC, js, verify, result: Failed

show code in pop-up

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

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

function solution(A) {
    let sum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    return sum - A.sum;
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.056 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, non-integer number found

Code: 09:16:53 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) {
    let sum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    console.log(sum);
    console.log(A.sum);

    return sum - A.sum;
}

Code: 09:16:55 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

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

function solution(A) {
    let sum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    console.log(sum);
    console.log(A.sum);

    return sum - A.sum;
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.056 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, non-integer number found

stdout:

10
undefined

Code: 09:17:10 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) {
    let sum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    console.log(sum);
    console.log(A.sum());

    return sum - A.sum;
}

Code: 09:17:40 UTC, js, autosave

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

function solution(A) {
    let sum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    return sum - A.sum;
}

Code: 09:17:53 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;
    let Asum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    return sum - A.sum;
}

Code: 09:18:04 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;
    let Asum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
    }

    return sum - Asum;
}

Code: 09:18:24 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 1; i < (A.length + 1); i++) {
        sum += i;
        aSum = 
    }

    return sum - aSum;
}

Code: 09:18:41 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;
    let aSum = 0;

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

    return sum - aSum;
}

Code: 09:18:52 UTC, js, autosave

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

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

function solution(A) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < A.length; i++) {
        sum += (i + 1);
        aSum = 
    }

    return sum - aSum;
}

Code: 09:19:07 UTC, js, verify, result: Failed

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

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

function solution(A) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < A.length; i++) {
        sum += (i + 1);
        aSum = A[i]
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 5 expected 4

0.056 s

WRONG ANSWER, got 5 expected 4

stdout:

10 5

Code: 09:19:57 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length); i++) {
        sum += (i + 1);
        aSum = A[i]
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Code: 09:20:08 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (A.)
        aSum = A[i]
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Code: 09:20:24 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length + 1) {
            aSum = A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Code: 09:20:48 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length + 1) {
        }
            aSum = A[i];
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Code: 09:20:55 UTC, js, verify, result: Failed

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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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length + 1) {
            aSum = A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.056 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, non-integer number found

stdout:

15 undefined

Code: 09:21:09 UTC, js, verify, result: Failed

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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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== (A.length + 1)) {
            aSum = A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.056 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, non-integer number found

stdout:

15 undefined

Code: 09:21:18 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length + 1) {
            aSum = A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Code: 09:21:32 UTC, js, verify, result: Failed

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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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length + 1) {
            aSum += A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.056 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, non-integer number found

stdout:

15 NaN

Code: 09:21:53 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length + 1) {
            co
            aSum += A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Code: 09:22:03 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length + 1) {
            console.log(i, aSum)
            aSum += A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.060 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, non-integer number found

stdout:

Code: 09:22:21 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length) {
            console.log(i, aSum)
            aSum += A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✔

0.056 s

stdout:

Code: 09:22:28 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length) {
            aSum += A[i];
        }
    }

    console.log(sum, aSum)

    return sum - aSum;
}

Code: 09:22:32 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

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

function solution(A) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length) {
            aSum += A[i];
        }
    }

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✔

0.056 s

Code: 09:22:46 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length) {
            aSum += A[i];
        }
    }

    return sum - aSum;
}

Analysis

expand all Example tests

▶

example
example test

✔

0.052 s

Code: 09:22:50 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) {
    let sum = 0;
    let aSum = 0;

    for (let i = 0; i < (A.length + 1); i++) {
        sum += (i + 1);

        if (i !== A.length) {
            aSum += A[i];
        }
    }

    return sum - aSum;
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

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

expand all Example tests

▶

example
example test

✔

0.056 s

expand all Correctness tests

▶

empty_and_single
empty list and single element

✔

0.052 s

▶

missing_first_or_last
the first or the last element is missing

✔

0.056 s

▶

single
single element

✔

0.056 s

0.052 s

▶

double
two elements

✔

0.052 s

0.056 s

▶

simple
simple test

✔

0.052 s

expand all Performance tests

▶

medium1
medium test, length = ~10,000

✔

0.068 s

▶

medium2
medium test, length = ~10,000

✔

0.068 s

▶

large_range
range sequence, length = ~100,000

✔

0.096 s

0.080 s

▶

large1
large test, length = ~100,000

✔

0.092 s

▶

large2
large test, length = ~100,000

✔

0.084 s