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// @Title: 有效的括号 (Valid Parentheses)
// @Author: 15816537946@163.com
// @Date: 2020-11-01 09:53:47
// @Runtime: 0 ms
// @Memory: 1.9 MB
func isValid(s string) bool {
	stack := make([]byte, len(s))
	var top int
	for _, c := range s {
		switch c {
		case '(':
			stack[top] = ')'
			top++
		case '{':
			stack[top] = '}'
			top++
		case '[':
			stack[top] = ']'
			top++
		case '}', ']', ')':
			if top > 0 && stack[top-1] == byte(c) {
				top--
			} else {
				return false
			}
		}
	}
	return top == 0
}