https://leetcode.com/problems/generate-parentheses/
暴搜。。
C++:
[C++]
void dfs(int n, int a, vector
    if (n == a){
        for (int i=0;i
        vector
        return z;
    }
};
[/cpp]
|  |  | |||
| 
 | ||||
|  |  | 
|  | 某岛
                                    … : "…アッカリ~ン . .. . " .. .                                 |  | 
|  |  | |||
| 
 | ||||
|  |  |