Same Tree
给两个树的node, 问是不是两个树一模一样.
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public 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;
return isSameTree(p.left,q.left) && isSameTree(p.right,q.right);
}
}