标签:style blog class code color int
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:
"((()))", "(()())", "(())()", "()(())", "()()()"
分析:此类问题一般和递归有关,仔细寻找规律发现可以通过往一个括号“()”的中间和右边(因为左边必须以左括号开始)两部分加入新的括号,可以得到结果。
class Solution { public: vector<string> generateParenthesis(int n) { vector<string> result; if(n == 0) { result.push_back(""); return result; } if(n == 1) { result.push_back("()"); return result; } for(int i = 0; i < n; i++) { vector<string> left_temp = generateParenthesis(i); for(auto left = left_temp.begin(); left != left_temp.end(); left++) { vector<string> right_temp = generateParenthesis(n - i - 1); for(auto right = right_temp.begin(); right != right_temp.end(); right++) result.push_back("(" + *left + ")" + *right); } } return result; } };
【Leetcode】Generate Parentheses,布布扣,bubuko.com
【Leetcode】Generate Parentheses
标签:style blog class code color int
原文地址:http://blog.csdn.net/lipantechblog/article/details/25321353