LeetCode22.括号生成 JavaScript

给出 n 代表生成括号的对数，请你写出一个函数，使其能够生成所有可能的并且有效的括号组合。

例如，给出 n = 3，生成结果为：

[
  "((()))",
  "(()())",
  "(())()",
  "()(())",
  "()()()"
]

/**
 * @param {number} n
 * @return {string[]}
 */
var generateParenthesis = function(n) {
    if (n == 1) {
        return ["()"];
    }
    
    let maxCombo = [];
    maxCombo[0] = 0;
    for (let i = 1; i < n * 2; i++) {
        if (i > n + 1) {
            maxCombo[i] = 0;
        } else {
            maxCombo[i] = 1;
        }
    }
    
    let maxComboCount = parseInt(maxCombo.join(''), 2);
    let leastComboCount = parseInt(Array(n).fill(1).join(''), 2);
    let results = [];

    for (let i = leastComboCount; i < maxComboCount; i++) {
        let binary = i.toString(2);

        let balancer_0 = n * 2 - binary.length;
        let balancer_1 = 0;
        let cont = false;

        let result = '';
        
        for (let j = 0; j < balancer_0; j++) {
            result += '(';
        }
        
        for (let j = 0; j < binary.length; j++) {
            if (binary[j] == '0') {
                balancer_0 += 1;
                result += '(';
            } else {
                balancer_1 += 1;
                result += ')';
            }

            if (balancer_1 > balancer_0) {
                cont = true;
                break;
            }
        }

        if (cont || balancer_0 != balancer_1) {
            continue;
        }
        
        results.push(result);
    }
    return results;
};