leetcode 100 Same Tree ----- java

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.

判断两棵树是否相同。

很简单。递归。

/**
 * 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) {

        return getResult(p,q);
    }
    public boolean getResult(TreeNode p,TreeNode q){
        if( p == null && q == null )
            return true;
        else if( p == null || q == null)
            return false;

        if( p.val != q.val)
            return false;

        return getResult(p.left,q.left)&&getResult(p.right,q.right);

    }
}