# Generate Parentheses Leetcode Solution

#### ByBrokenprogrammers

Nov 30, 2022

In this post, you will know how to solve the Generate Parentheses Leetcode Solution problem of Leetcode. This Leetcode problem is done in many programming languages like C++, Java, and Python.

One more thing to add, don’t directly look for the solutions, first try to solve the problems of Leetcode by yourself. If you find any difficulty after trying several times, then you can look for solutions.

## Problem

Given `n` pairs of parentheses, write a function to generate all combinations of well-formed parentheses.

Example 1:

```Input: n = 3
Output: ["((()))","(()())","(())()","()(())","()()()"]
```

Example 2:

```Input: n = 1
Output: ["()"]
```

Constraints:

• `1 <= n <= 8`

### Generate Parentheses Leetcode Solutions in Python

```class Solution:
def generateParenthesis(self, n):
ans = []
def dfs(l: int, r: int, s: str) -> None:
if l == 0 and r == 0:
ans.append(s)
if l > 0:
dfs(l - 1, r, s + '(')
if l < r:
dfs(l, r - 1, s + ')')
dfs(n, n, '')
return ans
```

### Generate Parentheses Leetcode Solutions in CPP

```class Solution {
public:
vector<string> generateParenthesis(int n) {
vector<string> ans;
dfs(n, n, "", ans);
return ans;
}
private:
void dfs(int l, int r, string&& path, vector<string>& ans) {
if (l == 0 && r == 0) {
ans.push_back(path);
return;
}
if (l > 0) {
path.push_back('(');
dfs(l - 1, r, move(path), ans);
path.pop_back();
}
if (l < r) {
path.push_back(')');
dfs(l, r - 1, move(path), ans);
path.pop_back();
}
}
};
```

### Generate Parentheses Leetcode Solutions in Java

```class Solution {
public List<String> generateParenthesis(int n) {
List<String> ans = new ArrayList<>();
dfs(n, n, new StringBuilder(), ans);
return ans;
}
private void dfs(int l, int r, final StringBuilder sb, List<String> ans) {
if (l == 0 && r == 0) {
return;
}
if (l > 0) {
sb.append("(");
dfs(l - 1, r, sb, ans);
sb.deleteCharAt(sb.length() - 1);
}
if (l < r) {
sb.append(")");
dfs(l, r - 1, sb, ans);
sb.deleteCharAt(sb.length() - 1);
}
}
}
```

Note: This problem Generate Parentheses is generated by Leetcode but the solution is provided by BrokenProgrammers. This tutorial is only for Educational and Learning purposes.