Test results - Codility

Tasks Details

easy

1. Brackets

Determine whether a given string of parentheses (multiple types) is properly nested.

Task Score

100%

Correctness

100%

Performance

100%

A string S consisting of N characters is considered to be properly nested if any of the following conditions is true:

S is empty;

S has the form "(U)" or "[U]" or "{U}" where U is a properly nested string;

S has the form "VW" where V and W are properly nested strings.

For example, the string "{[()()]}" is properly nested but "([)()]" is not.

Write a function:

function solution(S);

that, given a string S consisting of N characters, returns 1 if S is properly nested and 0 otherwise.

For example, given S = "{[()()]}", the function should return 1 and given S = "([)()]", the function should return 0, as explained above.

Write an efficient algorithm for the following assumptions:

N is an integer within the range [0..200,000];

string S is made only of the following characters: '(', '{', '[', ']', '}' and/or ')'.

Solution

Programming language used JavaScript

Time spent on task 7 minutes

Notes

not defined yet

Code: 08:28:19 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(String S) {
        // write your code in Java SE 8
    }
}

Code: 08:28:27 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
}

Code: 08:29:49 UTC, js, autosave

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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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket in A) {
        
    }
}

Code: 08:30:19 UTC, js, autosave

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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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' )
    }
}

Code: 08:30:50 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if ()
    }
}

Code: 08:31:12 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if ((bra))
    }
}

Code: 08:31:22 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            (bra)
        ) {
            
        }
    }
}

Code: 08:31:51 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            (bracket === ')') && brackets[brackets.length-1]
        ) {
            
        }
    }
}

Code: 08:32:08 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(')
        ) {
            
        }
    }
}

Code: 08:32:23 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ')') && brackets[brackets.length-1] === '(')
        ) {
            
        }
    }
}

Code: 08:32:33 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '{') && brackets[brackets.length-1] === '(')
        ) {
            
        }
    }
}

Code: 08:33:03 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           bracket.pop(); 
        } else {
            return 0;
        }
    }
    return brack
}

Code: 08:33:19 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           bracket.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

Code: 08:33:20 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           bracket.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

Analysis

expand all Example tests

▶

example1
example test 1

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

TypeError: bracket.pop is not a function
    at solution (solution.js:21:20)
    at solutionWrapper (/tmp/exec.js:394:28)
    at Promise.resolve.then (/tmp/exec.js:420:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
    at Function.Module.runMain (module.js:686:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

▶

example2
example test 2

✔

0.072 s

Code: 08:33:30 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           brackets.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

Analysis

expand all Example tests

▶

example1
example test 1

✔

0.072 s

▶

example2
example test 2

✔

0.072 s

Code: 08:33:49 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           brackets.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

Code: 08:34:14 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 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           brackets.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

User test case 1:

['']

User test case 2:

['[]']

User test case 3:

['[({})]']

User test case 4:

['([]{}{}{{})}']

Analysis

expand all Example tests

▶

example1
example test 1

✔

0.068 s

▶

example2
example test 2

✔

0.068 s

expand all User tests

▶

test_data1

✔

0.068 s

OK
function result: 1

▶

test_data2

✔

0.068 s

OK
function result: 1

▶

test_data3

✔

0.068 s

OK
function result: 1

▶

test_data4

✔

0.068 s

OK
function result: 0

Code: 08:34:21 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 27

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           brackets.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

Code: 08:34:25 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           brackets.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

User test case 1:

['']

User test case 2:

['[]']

User test case 3:

['[({})]']

User test case 4:

['([]{}{}{{})}']

User test case 5:

['[']

Analysis

expand all Example tests

▶

example1
example test 1

✔

0.072 s

▶

example2
example test 2

✔

0.072 s

expand all User tests

▶

test_data1

✔

0.072 s

OK
function result: 1

▶

test_data2

✔

0.068 s

OK
function result: 1

▶

test_data3

✔

0.068 s

OK
function result: 1

▶

test_data4

✔

0.068 s

OK
function result: 0

▶

test_data5

✔

0.068 s

OK
function result: 0

Code: 08:34:38 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           brackets.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

User test case 1:

['']

User test case 2:

['[]']

User test case 3:

['[({})]']

User test case 4:

['([]{}{}{{})}']

User test case 5:

['[']

Analysis

expand all Example tests

▶

example1
example test 1

✔

0.072 s

▶

example2
example test 2

✔

0.072 s

expand all User tests

▶

test_data1

✔

0.072 s

OK
function result: 1

▶

test_data2

✔

0.076 s

OK
function result: 1

▶

test_data3

✔

0.072 s

OK
function result: 1

▶

test_data4

✔

0.072 s

OK
function result: 0

▶

test_data5

✔

0.072 s

OK
function result: 0

Code: 08:34:41 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

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

function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    if (S.length === 0) {
        return 1;
    } else if (S.length % 2 === 1) {
        return 0;
    }
    let A = S.split('');
    let brackets = [];
    for (bracket of A) {
        if (bracket === '(' || bracket === '[' || bracket === '{') {
            brackets.push(bracket);
        } else if (
            ((bracket === ')') && brackets[brackets.length-1] === '(') ||
            ((bracket === ']') && brackets[brackets.length-1] === '[') ||
            ((bracket === '}') && brackets[brackets.length-1] === '{')
        ) {
           brackets.pop(); 
        } else {
            return 0;
        }
    }
    return brackets.length ? 0 : 1;
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N)

expand all Example tests

▶

example1
example test 1

✔

0.068 s

▶

example2
example test 2

✔

0.068 s

expand all Correctness tests

▶

negative_match
invalid structures

✔

0.068 s

▶

empty
empty string

✔

0.068 s

▶

simple_grouped
simple grouped positive and negative test, length=22

✔

0.068 s

expand all Performance tests

▶

large1
simple large positive test, 100K ('s followed by 100K )'s + )(

✔

0.264 s

0.068 s

0.088 s

▶

large2
simple large negative test, 10K+1 ('s followed by 10K )'s + )( + ()

✔

0.068 s

▶

large_full_ternary_tree
tree of the form T=(TTT) and depth 11, length=177K+

✔

0.236 s

▶

multiple_full_binary_trees
sequence of full trees of the form T=(TT), depths [1..10..1], with/without some brackets at the end, length=49K+

✔

0.120 s

0.068 s

0.120 s

0.068 s

▶

broad_tree_with_deep_paths
string of the form [TTT...T] of 300 T's, each T being '{{{...}}}' nested 200-fold, length=120K+

✔

0.216 s