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Height of Binary Tree - GFG/README.md

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+# Height of Binary Tree
+## Medium 
+<div class="problem-statement">
+                <p></p><p><span style="font-size:18px">Given a binary tree, find its height.</span></p>
+
+<p><br>
+<span style="font-size:18px"><strong>Example 1:</strong></span></p>
+
+<pre><span style="font-size:18px"><strong>Input:</strong>
+     1
+    /  \
+   2    3
+<strong>Output:</strong> 2</span>
+</pre>
+
+<p><span style="font-size:18px"><strong>Example 2:</strong></span></p>
+
+<pre><span style="font-size:18px"><strong>Input:</strong>
+  2
+   \
+    1
+   /
+ 3
+<strong>Output:</strong> 3   </span></pre>
+
+<p><br>
+<span style="font-size:18px"><strong>Your Task:</strong><br>
+You don't need to read input or print anything. Your task is to complete the function <strong>height() </strong>which takes root node of the tree as input parameter and returns an integer denoting the height of the tree. If the tree is empty, return 0.&nbsp;</span></p>
+
+<p><br>
+<span style="font-size:18px"><strong>Expected Time Complexity:</strong> O(N)<br>
+<strong>Expected Auxiliary Space:</strong> O(N)</span></p>
+
+<p><br>
+<span style="font-size:18px"><strong>Constraints:</strong><br>
+1 &lt;= Number of nodes &lt;= 10<sup>5</sup><br>
+1 &lt;= Data of a node &lt;= 10<sup>5</sup></span></p>
+ <p></p>
+            </div>