/************************************************************************
*
* 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:
*
* “((()))”, “(()())”, “(())()”, “()(())”, “()()()”
*
*
************************************************************************/
此题需要注意的是,用两个整数left,right去表示左括号和右括号的个数。然后递归的去添加。终止条件是都为0.
// Date : 2016.07.31
// Author : yqtao
// https://github.com/yqtaowhu
#include <iostream>
#include <vector>
#include <string>
using namespace std;
void generator(vector<string>& result, int left, int right, string s);
vector<string> generateParenthesis(int n) {
vector<string> result;
string s;
generator(result, n, n, s);
return result;
}
void generator(vector<string>& result, int left, int right, string s) {
if (left == 0 && right == 0) {
result.push_back(s);
return;
}
if (left>0) {
generator(result, left - 1, right, s + '(');
}
if (right>0 && right>left) {
generator(result, left, right - 1, s + ')');
}
}
void printResult(vector<string>& result)
{
for (int i = 0; i<result.size(); i++) {
cout << result[i] << endl;
}
}
int main(int argc, char** argv)
{
int n = 2;
vector<string> r = generateParenthesis(n);
printResult(r);
return 0;
}