89 lines
2.3 KiB
Java
89 lines
2.3 KiB
Java
//
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//
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// 给你两棵二叉树 root 和 subRoot 。检验 root 中是否包含和 subRoot 具有相同结构和节点值的子树。如果存在,返回 true ;否则
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//,返回 false 。
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//
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// 二叉树 tree 的一棵子树包括 tree 的某个节点和这个节点的所有后代节点。tree 也可以看做它自身的一棵子树。
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//
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//
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//
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// 示例 1:
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//
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//
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//输入:root = [3,4,5,1,2], subRoot = [4,1,2]
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//输出:true
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//
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//
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// 示例 2:
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//
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//
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//输入:root = [3,4,5,1,2,null,null,null,null,0], subRoot = [4,1,2]
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//输出:false
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//
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//
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//
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//
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// 提示:
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//
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//
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// root 树上的节点数量范围是 [1, 2000]
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// subRoot 树上的节点数量范围是 [1, 1000]
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// -104 <= root.val <= 104
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// -104 <= subRoot.val <= 104
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//
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//
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//
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// Related Topics 树 深度优先搜索 二叉树 字符串匹配 哈希函数
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// 👍 539 👎 0
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package leetcode.editor.cn;
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import com.code.leet.entiy.TreeNode;
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//572:另一棵树的子树
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class SubtreeOfAnotherTree {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new SubtreeOfAnotherTree().new Solution();
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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/**
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* Definition for a binary tree node.
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* public class TreeNode {
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* int val;
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* TreeNode left;
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* TreeNode right;
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* TreeNode() {}
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* TreeNode(int val) { this.val = val; }
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* TreeNode(int val, TreeNode left, TreeNode right) {
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* this.val = val;
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* this.left = left;
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* this.right = right;
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* }
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* }
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*/
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class Solution {
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public boolean isSubtree(TreeNode root, TreeNode subRoot) {
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if (root == null) {
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return false;
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}
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return check(root, subRoot) || isSubtree(root.left, subRoot) || isSubtree(root.right, subRoot);
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}
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public boolean check(TreeNode root, TreeNode subRoot) {
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if (root == null && subRoot == null) {
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return true;
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}
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if (root == null || subRoot == null || root.val != subRoot.val) {
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return false;
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}
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return check(root.left, subRoot.left) && check(root.right, subRoot.right);
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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} |