leetcode -- Generate Parentheses

4493 단어 LeetCode
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
For example, given n = 3, a solution set is: "((()))", "(()())", "(())()", "()(())", "()()()"
전형적인 귀속.한 걸음 한 걸음 문자열을 구성합니다.왼쪽 괄호가  
 1 public class Solution {
 2     public ArrayList<String> generateParenthesis(int n) {
 3         // Start typing your Java solution below
 4         // DO NOT write main() function
 5         ArrayList<String> result = new ArrayList<String>();
 6         if(n != 0){
 7             generate(result, "", 0, 0, 0, n);
 8         }        
 9         return result;
10     }
11     
12     public void generate(ArrayList<String> result, String tmp, int deep, int left, int right, int n){
13         if(deep == 2 * n){
14             result.add(tmp);
15             return;
16         }
17         
18         if(left < n){
19             tmp += "(";
20             generate(result, tmp, deep + 1, left + 1, right, n);
21             tmp = tmp.substring(0, tmp.length() - 1);
22         }
23         
24         if(right < left){
25             tmp += ")";
26             generate(result, tmp, deep + 1, left, right + 1, n);
27             tmp = tmp.substring(0, tmp.length() - 1);
28         }
29         
30     }
31 }

좋은 웹페이지 즐겨찾기