deno.land / x / masx200_leetcode_test@10.6.5 / binary-tree-postorder-traversal / index.ts
123456789101112131415161718192021import { TreeNode } from "../binary-tree-inorder-traversal/TreeNode.ts";
function postorder(root: TreeNode | null, output: (a: number) => void) { if (!root) { return; }
postorder(root.left, output);
postorder(root.right, output); output(root.val);}export default function postorderTraversal(root: TreeNode | null): number[] { if (!root) { return []; } const res: number[] = []; postorder(root, (a) => res.push(a)); return res;}
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