Valid Parentheses Given a string s containing just the characters '(' , ')' , '{' , '}' , '[' and ']' , determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct order. Every close bracket has a corresponding open bracket of the same type. Example 1: Input: s = "()" Output: true Example 2: Input: s = "()[]{}" Output: true Example 3: Input: s = "(]" Output: false Example 4: Input: s = "([])" Output: true Example 5: Input: s = "([)]" Output: false Constraints: 1 <= s.length <= 10 4 s consists of parentheses only '()[]{}' . Solution: class Solution : def isValid ( self , s : str ) -> bool : stack=[] valid={ ")" : "(" , "}" : "{" , "]" : "[" } ...