Watch 10 video solutions for Valid Parenthesis String, a medium level problem involving String, Dynamic Programming, Stack. This walkthrough by NeetCode has 475,216 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.
The following rules define a valid string:
'(' must have a corresponding right parenthesis ')'.')' must have a corresponding 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 <= 100s[i] is '(', ')' or '*'.