Package g0601_0700.s0678_valid_parenthesis_string

Class Solution

java.lang.Object
g0601_0700.s0678_valid_parenthesis_string.Solution
public class Solution extends Object
678 - Valid Parenthesis String.

Medium

Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.

The following rules define a valid string:

  • Any left parenthesis '(' must have a corresponding right parenthesis ')'.
  • Any right parenthesis ')' must have a corresponding left parenthesis '('.
  • Left parenthesis '(' must go before the corresponding right parenthesis ')'.
  • '*' could be treated as a single right parenthesis ')' or a single left parenthesis '(' or an empty string "".

Example 1:

Input: s = “()”

Output: true

Example 2:

Input: s = “(*)”

Output: true

Example 3:

Input: s = “(*))”

Output: true

Constraints:

  • 1 <= s.length <= 100
  • s[i] is '(', ')' or '*'.

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • checkValidString

      public boolean checkValidString(String s)