题目：

题解：

func isValid(s string) bool {n := len(s)if n % 2 == 1 {return false}pairs := map[byte]byte{')': '(',']': '[','}': '{',}stack := []byte{}for i := 0; i < n; i++ {if pairs[s[i]] > 0 {if len(stack) == 0 || stack[len(stack)-1] != pairs[s[i]] {return false}stack = stack[:len(stack)-1]} else {stack = append(stack, s[i])}}return len(stack) == 0
}