Create Count Complete Tree Nodes.java

Author: sudoshivesh

medium/Count Complete Tree Nodes.java

@@ -0,0 +1,23 @@
+//222.Count Complete Tree Nodes.java
+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode() {}
+ *     TreeNode(int val) { this.val = val; }
+ *     TreeNode(int val, TreeNode left, TreeNode right) {
+ *         this.val = val;
+ *         this.left = left;
+ *         this.right = right;
+ *     }
+ * }
+ */
+class Solution {
+  public int countNodes(TreeNode root) {
+    if (root == null)
+      return 0;
+    return 1 + countNodes(root.left) + countNodes(root.right);
+  }
+}