add leetcode problem-cn part2

算法题（国内版）/problem (English)/检查子树(English) [check-subtree-lcci].html

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+<p>T1&nbsp;and T2 are two very large binary trees. Create an algorithm to determine if T2 is a subtree of T1.</p>
+
+<p>A tree T2 is a subtree of T1&nbsp;if there exists a node n in T1&nbsp;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.</p>
+
+<p><strong>Note:</strong> This problem is slightly different from the original problem.</p>
+
+<p><strong>Example1:</strong></p>
+
+<pre>
+<strong> Input</strong>: t1 = [1, 2, 3], t2 = [2]
+<strong> Output</strong>: true
+</pre>
+
+<p><strong>Example2:</strong></p>
+
+<pre>
+<strong> Input</strong>: t1 = [1, null, 2, 4], t2 = [3, 2]
+<strong> Output</strong>: false
+</pre>
+
+<p><strong>Note: </strong></p>
+
+<ol>
+	<li>The node numbers of both tree are in [0, 20000].</li>
+</ol>