[ PS ] : Invert Binary Tree

Author: uraflower

invert-binary-tree/uraflower.js

@@ -0,0 +1,26 @@
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+
+/**
+ * 이진 트리를 좌우 반전하여 반환하는 함수
+ * @param {TreeNode} root
+ * @return {TreeNode}
+ */
+const invertTree = function (root) {
+    if (root !== null) {
+        invertTree(root.right);
+        invertTree(root.left);
+        [root.right, root.left] = [root.left, root.right];
+    }
+
+    return root;
+};
+
+// 시간복잡도: O(n)
+// 공간복잡도: O(n)