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package g0901_1000.s0951_flip_equivalent_binary_trees;

// #Medium #Depth_First_Search #Tree #Binary_Tree
// #2022_12_26_Time_0_ms_(100.00%)_Space_40.2_MB_(73.95%)

import com_github_leetcode.TreeNode;

/*
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode() {}
 *     TreeNode(int val) { this.val = val; }
 *     TreeNode(int val, TreeNode left, TreeNode right) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
public class Solution {
    public boolean flipEquiv(TreeNode root1, TreeNode root2) {
        if (root1 == null && root2 == null) {
            return true;
        }
        if (root1 == null || root2 == null) {
            return false;
        }
        if (root1.val != root2.val) {
            return false;
        }
        return flipEquiv(root1.left, root2.left) && flipEquiv(root1.right, root2.right)
                || flipEquiv(root1.left, root2.right) && flipEquiv(root1.right, root2.left);
    }
}