T1 and T2 are two very large binary trees. Create an algorithm to determine if T2 is a subtree of T1.
\r\n\r\nA tree T2 is a subtree of T1 if there exists a node n in T1 such that the subtree of n is identical to T2. That is, if you cut off the tree at node n, the two trees would be identical.
\r\n\r\nNote: This problem is slightly different from the original problem.
\r\n\r\nExample1:
\r\n\r\n\r\n Input: t1 = [1, 2, 3], t2 = [2]\r\n Output: true\r\n\r\n\r\n
Example2:
\r\n\r\n\r\n Input: t1 = [1, null, 2, 4], t2 = [3, 2]\r\n Output: false\r\n\r\n\r\n
Note:
\r\n\r\n检查子树。你有两棵非常大的二叉树：T1，有几万个节点；T2，有几万个节点。设计一个算法，判断 T2 是否为 T1 的子树。
\n\n如果 T1 有这么一个节点 n，其子树与 T2 一模一样，则 T2 为 T1 的子树，也就是说，从节点 n 处把树砍断，得到的树与 T2 完全相同。
\n\n注意：此题相对书上原题略有改动。
\n\n示例1:
\n\n\n 输入：t1 = [1, 2, 3], t2 = [2]\n 输出：true\n\n\n
示例2:
\n\n\n 输入：t1 = [1, null, 2, 4], t2 = [3, 2]\n 输出：false\n\n\n
提示：
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