226. Invert Binary Tree Solution

typescript/226-Invert-Binary-Tree.ts

@@ -0,0 +1,24 @@
+/**
+ * Definition for a binary tree node.
+ * class TreeNode {
+ * val: number
+ * left: TreeNode | null
+ * right: TreeNode | null
+ * constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
+ * this.val = (val===undefined ? 0 : val)
+ * this.left = (left===undefined ? null : left)
+ * this.right = (right===undefined ? null : right)
+ * }
+ * }
+ */
+
+function invertTree(root: TreeNode | null): TreeNode | null {
+ if (!root) return root
+ const temp: TreeNode | null = root.left
+ root.left = root.right
+ root.right = temp
+
+ invertTree(root.left)
+ invertTree(root.right)
+ return root
+}