[leetcode]100. Same Tree@Java解题报告

https://leetcode.com/problems/same-tree/description/

Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

package go.jacob.day805;

public class Demo3 {
/*
* 简单的递归实现
*/
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 isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
}
return false;
}

private class TreeNode {
int val;
TreeNode left;
TreeNode right;

TreeNode(int x) {
val = x;
}
}
}