008-validate-properly-nested-brackets.js

'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', function(inputStdin) {
    inputString += inputStdin;
});

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

function readLine() {
    return inputString[currentLine++];
}



/*
 * Complete the 'areBracketsProperlyMatched' function below.
 *
 * The function is expected to return a BOOLEAN.
 * The function accepts STRING code_snippet as parameter.
 */

function areBracketsProperlyMatched(code_snippet) {
    const stack = [];
    const pairs = {
        ')': '(',
        '}': '{',
        ']': '['
    };

    for (let ch of code_snippet) {
        if (ch === '(' || ch === '{' || ch === '[') {
            stack.push(ch);
        } else if (ch === ')' || ch === '}' || ch === ']') {
            if (stack.length === 0 || stack.pop() !== pairs[ch]) {
                return 0;
            }
        }
    }

    return stack.length === 0 ? 1 : 0;
   
}

function main() {
    const code_snippet = readLine();

    const result = areBracketsProperlyMatched(code_snippet);

    process.stdout.write((result ? 1 : 0) + '\n');
}