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LeetCode-Generate Parentheses

题目:

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:

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

 

采用递归的方式求解

 1 class Solution{ 2 public: 3        void generate(vector<string> &res,string curr,int m,int n){ 4                if(m==0 && n==0){ //递归终止条件 5                    res.push_back(curr); 6                    return; 7                } 8                 9                if(m!=0) generate(res,curr+"(",m-1,n);10                11                if(m<n && n!=0) generate(res,curr+")",m,n-1);12        }13        14        vector<string> generateParenthesis(int n){15                vector<string> res;16                res.clear();17                18                if(n>0){19                    generate(res,string(),n,n);20                }21                22                return ret;23        }24 };

 

LeetCode-Generate Parentheses