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Java Solution for LeetCode algorithm problems, continually updating
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package g0501_0600.s0572_subtree_of_another_tree;
// #Easy #Depth_First_Search #Tree #Binary_Tree #Hash_Function #String_Matching
// #Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search
// #2022_08_10_Time_1_ms_(100.00%)_Space_47.2_MB_(13.44%)
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 {
private boolean isSubtreeFound(TreeNode root, TreeNode subRoot) {
if (root == null && subRoot == null) {
return true;
}
if (root == null || subRoot == null) {
return false;
}
if (root.val == subRoot.val) {
return isSubtreeFound(root.left, subRoot.left) && isSubtree(root.right, subRoot.right);
} else {
return false;
}
}
public boolean isSubtree(TreeNode root, TreeNode subRoot) {
if (root == null && subRoot == null) {
return true;
}
if (root == null || subRoot == null) {
return false;
}
return isSubtreeFound(root, subRoot)
|| isSubtree(root.left, subRoot)
|| isSubtree(root.right, subRoot);
}
}