100:相同的树

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轩辕龙儿 2022-03-15 22:50:38 +08:00
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//给你两棵二叉树的根节点 p q 编写一个函数来检验这两棵树是否相同
//
// 如果两个树在结构上相同并且节点具有相同的值则认为它们是相同的
//
//
//
// 示例 1
//
//
//输入p = [1,2,3], q = [1,2,3]
//输出true
//
//
// 示例 2
//
//
//输入p = [1,2], q = [1,null,2]
//输出false
//
//
// 示例 3
//
//
//输入p = [1,2,1], q = [1,1,2]
//输出false
//
//
//
//
// 提示
//
//
// 两棵树上的节点数目都在范围 [0, 100]
// -10 <= Node.val <= 10
//
// Related Topics 深度优先搜索 广度优先搜索 二叉树 👍 776 👎 0
package leetcode.editor.cn;
import com.code.leet.entiy.TreeNode;
//100:相同的树
public class SameTree {
public static void main(String[] args) {
Solution solution = new SameTree().new Solution();
}
//leetcode submit region begin(Prohibit modification and deletion)
/**
* 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;
* }
* }
*/
class Solution {
public boolean isSameTree(TreeNode p, TreeNode q) {
if (p == null && q == null) {
return true;
}
if (p == null || q == null) {
return false;
}
if (p.val != q.val) {
return false;
}
if (!isSameTree(p.left, q.left)) {
return false;
}
if (!isSameTree(p.right, q.right)) {
return false;
}
return true;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

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<p>给你两棵二叉树的根节点 <code>p</code><code>q</code> ,编写一个函数来检验这两棵树是否相同。</p>
<p>如果两个树在结构上相同,并且节点具有相同的值,则认为它们是相同的。</p>
<p> </p>
<p><strong>示例 1</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/12/20/ex1.jpg" style="width: 622px; height: 182px;" />
<pre>
<strong>输入:</strong>p = [1,2,3], q = [1,2,3]
<strong>输出:</strong>true
</pre>
<p><strong>示例 2</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/12/20/ex2.jpg" style="width: 382px; height: 182px;" />
<pre>
<strong>输入:</strong>p = [1,2], q = [1,null,2]
<strong>输出:</strong>false
</pre>
<p><strong>示例 3</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/12/20/ex3.jpg" style="width: 622px; height: 182px;" />
<pre>
<strong>输入:</strong>p = [1,2,1], q = [1,1,2]
<strong>输出:</strong>false
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li>两棵树上的节点数目都在范围 <code>[0, 100]</code></li>
<li><code>-10<sup>4</sup> <= Node.val <= 10<sup>4</sup></code></li>
</ul>
<div><div>Related Topics</div><div><li></li><li>深度优先搜索</li><li>广度优先搜索</li><li>二叉树</li></div></div><br><div><li>👍 776</li><li>👎 0</li></div>