# 921. Minimum Add to Make Parentheses Valid LeetCode Solution Share:

Minimum Add to Make Parentheses Valid A parentheses string is valid if and only if:

• It is the empty string,
• It can be written as `AB` (`A` concatenated with `B`), where `A` and `B` are valid strings, or
• It can be written as `(A)`, where `A` is a valid string.

You are given a parentheses string `s`. In one move, you can insert a parenthesis at any position of the string.

• For example, if `s = "()))"`, you can insert an opening parenthesis to be `"(()))"` or a closing parenthesis to be `"())))"`.

Return the minimum number of moves required to make `s` valid.

Example 1:

```Input: s = "())"
Output: 1
```

Example 2:

```Input: s = "((("
Output: 3
```

Constraints:

• `1 <= s.length <= 1000`
• `s[i]` is either `'('` or `')'`.

Time: O(n)
Space: O(n)

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