feat : invert-binary-tree

Author: ekgns33

invert-binary-tree/ekgns33.java

@@ -0,0 +1,25 @@
+/**
+ * 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 TreeNode invertTree(TreeNode root) {
+    if(root == null) return null;
+    TreeNode left = invertTree(root.left);
+    TreeNode right = invertTree(root.right);
+    root.right = left;
+    root.left =right;
+    return root;
+  }
+}