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Given two non-empty binary trees **s** and **t**, check whether tree **t** has exactly the same structure and node values with a subtree of **s**. A subtree of **s** is a tree consists of a node in **s** and all of this node's descendants. The tree **s** could also be considered as a subtree of itself.

**Example 1:**

Given tree s:

3 / \ 4 5 / \ 1 2Given tree t:

4 / \ 1 2Return

**Example 2:**

Given tree s:

3 / \ 4 5 / \ 1 2 / 0Given tree t:

4 / \ 1 2Return

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