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递归比较即可
AC代码:
/**
* 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;
else if((p==null && q!=null) || (p!=null && q==null) || (p!=null && q!=null && p.val!=q.val)) return false;
else return isSameTree(p.left,q.left) && isSameTree(p.right,q.right);
}
}