LeetCode100 SameTree java题解

题目：

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.

解题：

依次遍历每一个点，如果都为Null或是都不为null且值相等 返回true,一个为Null另一个不为Null返回false 两个都不为null但值不相等返回false。

代码：

 public static 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 false;
		 return isSameTree(p.left, q.left)&&isSameTree(p.right, q.right);
			 
	        
	 }