[swift] LeetCode 20. Valid Parentheses
Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid.
The brackets must close in the correct order, “()” and “()[]{}” are all valid but “(]” and “([)]” are not.
func isValid(_ s: String) -> Bool {var stack = [Character](), b = truefunc compare(_ c: Character) -> Bool {guard let t = stack.popLast() else { return false }return (c == ")" && t == "(") || (c == "]" && t == "[" ) || (c == "}" && t == "{")}loop: for c in s {switch c {case "(", "[", "{":stack.append(c)default:b = compare(c)if !b { break loop }}}return b && stack.isEmpty
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