借用arraystack的包完成
import github.com/emirpasic/gods/stacks/arraystack
func isValid(s string) bool {
stack := arraystack.New()
for _, c := range s {
if c == '(' {
stack.Push(')')
} else if c == '[' {
stack.Push(']')
} else if c == '{' {
stack.Push('}')
} else {
if stack.Empty()
