package top100liked

import (
	"fmt"
	"testing"
)

// https://leetcode.cn/problems/valid-parentheses/description/?envType=study-plan-v2&envId=top-100-liked

func isValid(s string) bool {
	stack := []rune{}
	for _, c := range s {
		if c == '(' || c == '[' || c == '{' {
			stack = append(stack, c)
		} else {
			if len(stack) == 0 {
				return false
			}
			pre := stack[len(stack)-1]
			stack = stack[:len(stack)-1]
			if c == ')' && pre != '(' {
				return false
			}
			if c == ']' && pre != '[' {
				return false
			}
			if c == '}' && pre != '{' {
				return false
			}
		}
	}
	return len(stack) == 0
}

func Test(t *testing.T) {
	fmt.Println(isValid("()"))
	fmt.Println(isValid("()[]{}"))
	fmt.Println(isValid("(]"))
	fmt.Println(isValid("([])"))
	fmt.Println(isValid("([)]"))
	fmt.Println(isValid("("))
	fmt.Println(isValid("]"))
}