[week2] solve 226. Invert Binary Tree

Author: bky373

invert-binary-tree/bky373.java

@@ -0,0 +1,16 @@
+/**
+ * - 문제: https://leetcode.com/problems/linked-list-cycle/
+ * - TC: O(N)
+ * - SC: O(N)
+ */
+public class Solution_226 {
+    public TreeNode invertTree(TreeNode root) {
+        if (root == null) {
+            return null;
+        }
+        TreeNode tmp = root.left;
+        root.left = invertTree(root.right);
+        root.right = invertTree(tmp);
+        return root;
+    }
+}