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 9 minutes

Notes

not defined yet

Code: 06:21:20 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11

// 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: 06:21:20 UTC, java, autosave

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1 2 3 4 5 6 7 8 9 10 11

// 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: 06:21:27 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

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.chatAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.chatAt(i));
                break;
            case ')':
                if(stack.top() == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack.top() == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack.top() == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    return stack.empty();
}

The submission is being evaluated.

Code: 06:21:51 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.chatAt(i));
                break;
            case ')':
                if(stack.top() == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack.top() == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack.top() == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    return stack.empty();
}

Code: 06:21:58 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

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack.top() == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack.top() == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack.top() == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    return stack.empty();
}

The submission is being evaluated.

Code: 06:24:43 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack. == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack.top() == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack.top() == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    return stack.empty();
}

Code: 06:24:53 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack.top() == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack.top() == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    return stack.empty();
}

Code: 06:25:02 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    return stack.empty();
}

The submission is being evaluated.

Code: 06:25:31 UTC, js, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    if
    return stack.empty();
}

Code: 06:25:57 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 47 48

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    if(!stack){
        return 1;
    }
    else{
        return 0;
    }
}

Code: 06:25:58 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 47 48

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    if(!stack){
        return 1;
    }
    else{
        return 0;
    }
}

The submission is being evaluated.

Code: 06:26:23 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 47 48 49

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    console.log(stack);
    if(!stack){
        return 1;
    }
    else{
        return 0;
    }
}

The submission is being evaluated.

Code: 06:28:45 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 47 48 49

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    console.log(stack);
    if(stack){
        return 1;
    }
    else{
        return 0;
    }
}

Code: 06:29:02 UTC, js, verify, result: Passed

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    console.log(stack);
    if(stack.length > 0){
        return 0;
    }
    else{
        return 1;
    }
}

The submission is being evaluated.

Code: 06:29:14 UTC, js, autosave

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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    
    if(stack.length > 0){
        return 0;
    }
    else{
        return 1;
    }
}

Code: 06:29:52 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 47 48 49

// 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)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    
    if(stack.length > 0){
        return 0;
    }
    else{
        return 1;
    }
}

The submission is being evaluated.

Code: 06:29:57 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    
    if(stack.length > 0){
        return 0;
    }
    else{
        return 1;
    }
}

The submission is being evaluated.

Code: 06:29:59 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(S) {
    // write your code in JavaScript (Node.js 8.9.4)
    const N = S.length;
    let stack = [];
    
    for(let i=0; i<N; i++){
        switch(S.charAt(i)){
            case '(':
            case '{':
            case '[':
                stack.push(S.charAt(i));
                break;
            case ')':
                if(stack[stack.length-1] == '('){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case '}':
                if(stack[stack.length-1] == '{'){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
            case ']':
                if(stack[stack.length-1] == '['){
                    stack.pop();
                }
                else{
                    return 0;
                }
                break;
        }
    }
    
    if(stack.length > 0){
        return 0;
    }
    else{
        return 1;
    }
}

The submission is being evaluated.