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Count Non-Leaf Nodes in Tree - GFG/README.md

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+# Count Non-Leaf Nodes in Tree
+## Easy
+<div class="problems_problem_content__Xm_eO"><p><span style="font-size:18px">Given a Binary Tree of size&nbsp;<strong>N</strong>, your task is to complete the function <strong>countNonLeafNodes()</strong>, that should return the count of all the non-leaf nodes of the given binary tree.</span></p>
+
+<p><span style="font-size:18px"><strong>Example:</strong></span></p>
+
+<pre><span style="font-size:18px"><strong>Input:</strong> 
+<input alt="Image" src="https://cdncontribute.geeksforgeeks.org/wp-content/uploads/tree121.gif" style="height:156px; width:259px" type="image" fdprocessedid="orzx9f">
+<strong>Output:</strong>
+2
+<strong>Explanation:</strong>
+Nodes 1 and 2 are the only non leaf nodes.</span>
+</pre>
+
+<p><span style="font-size:18px"><strong>Your&nbsp;Task:</strong><br>
+You don't need to take input or print anything. Your task is to <strong>complete </strong>the function&nbsp;<strong>countNonLeafNodes()&nbsp;</strong>that takes <strong>root </strong>as input and returns the number of non leaf nodes in the tree.</span></p>
+
+<p><span style="font-size:18px"><strong>Expected Time Complexity: </strong>O(N).<br>
+<strong>Expected Auxiliary Space: </strong>O(Height of the Tree).</span></p>
+
+<p><span style="font-size:18px"><strong>Constraints:</strong><br>
+1 ≤ Number of nodes ≤ 10<sup>5</sup></span></p>
+</div>