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import { TreeNode } from "../binary-tree-inorder-traversal/TreeNode.ts";
export default function checkTree(root: TreeNode | null): boolean {    if (!root) return false;    const [sum, left, right] = [root?.val, root?.left?.val, root?.right?.val];    return (        typeof left === "number" &&        typeof right === "number" &&        sum === left + right    );}