LeetCode #20 ✅ Valid Parentheses

func validParenthesesIsValid(_ s: String) -> Bool { var stack = [Character]() let map: [Character: Character] = [")" : "(", "}" : "{", "]" : "["] for char in s { if map.values.contains(char) { stack.append(char) } else if let last = stack.last, map[char] == last { stack.removeLast() } else { return false } } return stack.isEmpty } let result = validParenthesesIsValid("()[]{}") print(result) // Output: True 

func validParenthesesIsValid(_ s: String) -> Bool { var stack = [Character]() let paris: [Character: Character] = [")":"(", "}":"{", "]":"["] for char in s { if let match = paris[char], !stack.isEmpty, stack.last == match { stack.removeLast() } else { stack.append(char) } } return stack.isEmpty }