100. Same Tree

原题链接：https://leetcode.com/problems/same-tree/description/
这道题目本身超级简单，解法就是递归遍历二叉树即可！

/**
 * 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) {
        if (p == q) {
            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;
    }