package top100liked

import (
	"testing"
)

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

type TreeNode struct {
	Val   int
	Left  *TreeNode
	Right *TreeNode
}

func isSymmetric(root *TreeNode) bool {
	return check(root.Left, root.Right)
}

func check(p, q *TreeNode) bool {
	if p == nil && q == nil {
		return true
	}
	if p == nil || q == nil {
		return false
	}
	return p.Val == q.Val && check(p.Left, q.Right) && check(p.Right, q.Left)
}

func Test1(t *testing.T) {

}