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LeetCode: Generate Parentheses 题解

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:

"((()))", "(()())", "(())()", "()(())", "()()()"

题解: 很容易想到DFS, 采用递归的方式进行,比较难把握的是每次递归的结果用什么来存储,终止条件是什么。

需要注意的是,在每次递归的时候剩余左括号不可能比右括号多,否则就终止。

 1 class Solution { 2 public: 3     vector<string> vi; 4     void generateOne(int left,int right,string s) 5     { 6        if(left==0) 7        { 8            vi.push_back(s+string(right,))); 9            return ;10        }11        if(left>=right)12            generateOne(left-1,right,s+();13        else14        {15            generateOne(left-1,right,s+();16            generateOne(left,right-1,s+));17        }18     }19     vector<string> generateParenthesis(int n) {20         int left=n,right=n;21         vi.clear();22         generateOne(n,n,"");23         return vi;24     }25 };

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