g0901_1000.s0921_minimum_add_to_make_parentheses_valid.Solution

public class Solution extends Object

921 - Minimum Add to Make Parentheses Valid.

Medium

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:

Class Solution

Constructor Summary