Same Tree
Given two binary trees, write a function to check if they are the same or not.
Two binary trees are considered the same if they are structurally identical and the nodes have the same value.
代码思路
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
class Solution {
public boolean isSameTree(TreeNode p, TreeNode q) {
//采用递归的方式
if(p==null && q==null)
return true;
if(p==null || q==null)
return false;
if(p.val==q.val)
return isSameTree(p.left,q.left)&&isSameTree(p.right,q.right);
else
return false;
}
}