leetcode-100-相同的树

1.问题描述
https://leetcode-cn.com/problems/same-tree/

2.解题代码

/*
 * @lc app=leetcode.cn id=100 lang=csharp
 *
 * [100] 相同的树
 */

// @lc code=start
/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     public int val;
 *     public TreeNode left;
 *     public TreeNode right;
 *     public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
public class Solution {
    public bool IsSameTree(TreeNode p, TreeNode q) {
        return NodeSame(p,q);
    }

    public bool NodeSame(TreeNode p,TreeNode q)
    {
        if(p==null&&q==null)
        {
            return true;
        }
        else if(p!=null&&q!=null)
        {
            if(p.val!=q.val)
            {
                return false;
            }
            else
            {
                if(!NodeSame(p.left,q.left))
                {
                    return false;
                }
                if(!NodeSame(p.right,q.right))
                {
                    return false;
                }
                return true;
            }
        }
        else
        {
            return false;
        }
    }
}
// @lc code=end