Test results - Codility

Tasks Details

easy

1. BinaryGap

Find longest sequence of zeros in binary representation of an integer.

Task Score

100%

Correctness

100%

Performance

Not assessed

A binary gap within a positive integer N is any maximal sequence of consecutive zeros that is surrounded by ones at both ends in the binary representation of N.

For example, number 9 has binary representation 1001 and contains a binary gap of length 2. The number 529 has binary representation 1000010001 and contains two binary gaps: one of length 4 and one of length 3. The number 20 has binary representation 10100 and contains one binary gap of length 1. The number 15 has binary representation 1111 and has no binary gaps. The number 32 has binary representation 100000 and has no binary gaps.

Write a function:

function solution(N);

that, given a positive integer N, returns the length of its longest binary gap. The function should return 0 if N doesn't contain a binary gap.

For example, given N = 1041 the function should return 5, because N has binary representation 10000010001 and so its longest binary gap is of length 5. Given N = 32 the function should return 0, because N has binary representation '100000' and thus no binary gaps.

Write an efficient algorithm for the following assumptions:

N is an integer within the range [1..2,147,483,647].

Solution

Programming language used JavaScript

Time spent on task 7 minutes

Notes

not defined yet

Task timeline

Code: 09:31:39 UTC, java, autosave

show code in pop-up

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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 N) {
        // write your code in Java SE 8
    }
}

Code: 09:31:47 UTC, js, autosave

show code in pop-up

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(N) {
    const 
}

Code: 09:32:18 UTC, js, autosave

show code in pop-up

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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    
    // 1로 쪼갠다.
    const split
}

Code: 09:32:25 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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    console.log(splitted)
}

Analysis

expand all Example tests

▶

example1
example test n=1041=10000010001_2

✘

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, 'undefined' found
Perhaps you are missing a 'return'?

stdout:

[ '', '00000', '000', '' ]

▶

example2
example test n=15=1111_2

✘

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, 'undefined' found
Perhaps you are missing a 'return'?

stdout:

[ '', '', '', '', '' ]

▶

example3
example test n=32=100000_2

✘

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, 'undefined' found
Perhaps you are missing a 'return'?

stdout:

[ '', '00000' ]

Code: 09:32:53 UTC, js, autosave

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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    co
}

Code: 09:33:04 UTC, js, autosave

show code in pop-up

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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    // 자
    const
}

Code: 09:33:25 UTC, js, autosave

show code in pop-up

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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    
    if (splitted.length <= 2) {
        return 
    }
}

Code: 09:33:36 UTC, js, autosave

show code in pop-up

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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    
    if (splitted.length <= 2) {
        return 0
    }
}

Code: 09:33:41 UTC, js, verify, result: Failed

show code in pop-up

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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    
    if (splitted.length <= 2) {
        return 0
    }
}

Analysis

expand all Example tests

▶

example1
example test n=1041=10000010001_2

✘

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, 'undefined' found
Perhaps you are missing a 'return'?

▶

example2
example test n=15=1111_2

✘

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, 'undefined' found
Perhaps you are missing a 'return'?

▶

example3
example test n=32=100000_2

✔

0.072 s

Code: 09:34:07 UTC, js, autosave

show code in pop-up

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(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        splitted
    }
}

Code: 09:34:35 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        
    }
}

Code: 09:34:52 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        
        console.log(splitted)
    }
}

Analysis

expand all Example tests

▶

example1
example test n=1041=10000010001_2

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.076 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, 'undefined' found
Perhaps you are missing a 'return'?

stdout:

[ '', '00000', '000' ]

▶

example2
example test n=15=1111_2

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.076 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Invalid result type, integer expected, 'undefined' found
Perhaps you are missing a 'return'?

stdout:

[ '', '', '', '' ]

▶

example3
example test n=32=100000_2

✔

0.072 s

Code: 09:35:55 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        
        네
    }
}

Code: 09:36:21 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        
        splitted.reduce((p, c) => p.length > c.length ? p.length :  , 0)
    }
}

Code: 09:36:46 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        
        return splitted.reduce((p, c) => c.length > p ? c.length : p , 0)
    }
}

Analysis

expand all Example tests

▶

example1
example test n=1041=10000010001_2

✔

0.072 s

▶

example2
example test n=15=1111_2

✔

0.072 s

▶

example3
example test n=32=100000_2

✔

0.072 s

Code: 09:37:19 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        //
        return splitted.reduce((p, c) => c.length > p ? c.length : p , 0)
    }
}

Code: 09:37:29 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        // 제일 
        return splitted.reduce((p, c) => c.length > p ? c.length : p , 0)
    }
}

Code: 09:38:10 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        // 제일 
        return splitted.reduce((p, c) => c.length > p ? c.length : p , 0)
    }
}

Analysis

expand all Example tests

▶

example1
example test n=1041=10000010001_2

✔

0.072 s

▶

example2
example test n=15=1111_2

✔

0.072 s

▶

example3
example test n=32=100000_2

✔

0.072 s

Code: 09:38:14 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        // 제일 
        return splitted.reduce((p, c) => c.length > p ? c.length : p , 0)
    }
}

Analysis

expand all Example tests

▶

example1
example test n=1041=10000010001_2

✔

0.072 s

▶

example2
example test n=15=1111_2

✔

0.072 s

▶

example3
example test n=32=100000_2

✔

0.072 s

Code: 09:38:17 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

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

function solution(N) {
    // 2진법으로 변환
    const binary = N.toString(2)
    // 1로 쪼갠다.
    const splitted = binary.split(1)
    
    // 두개 이하로 쪼개질 경우, 1이 한개 밖에 없으므로 값은 0
    if (splitted.length <= 2) {
        return 0
    } else {
        // 마지막 나누기는 의미가 없다. 
        // '' 이거나 1로 막혀있지 않다면 숫자가 나올 것이므로
        splitted.pop()
        // 제일 
        return splitted.reduce((p, c) => c.length > p ? c.length : p , 0)
    }
}

Analysis summary

The solution obtained perfect score.

Analysis

expand all Example tests

▶

example1
example test n=1041=10000010001_2

✔

0.072 s

▶

example2
example test n=15=1111_2

✔

0.068 s

▶

example3
example test n=32=100000_2

✔

0.068 s

expand all Correctness tests

▶

extremes
n=1, n=5=101_2 and n=2147483647=2**31-1

✔

0.072 s

▶

trailing_zeroes
n=6=110_2 and n=328=101001000_2

✔

0.072 s

▶

power_of_2
n=5=101_2, n=16=2**4 and n=1024=2**10

✔

0.072 s

▶

simple1
n=9=1001_2 and n=11=1011_2

✔

0.068 s

▶

simple2
n=19=10011 and n=42=101010_2

✔

0.072 s

▶

simple3
n=1162=10010001010_2 and n=5=101_2

✔

0.072 s

▶

medium1
n=51712=110010100000000_2 and n=20=10100_2

✔

0.072 s

▶

medium2
n=561892=10001001001011100100_2 and n=9=1001_2

✔

0.072 s

▶

medium3
n=66561=10000010000000001_2

✔

0.072 s

▶

large1
n=6291457=11000000000000000000001_2

✔

0.072 s

▶

large2
n=74901729=100011101101110100011100001

✔

0.068 s

▶

large3
n=805306373=110000000000000000000000000101_2

✔

0.072 s

▶

large4
n=1376796946=1010010000100000100000100010010_2

✔

0.072 s

▶

large5
n=1073741825=1000000000000000000000000000001_2

✔

0.068 s

▶

large6
n=1610612737=1100000000000000000000000000001_2

✔

0.072 s