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import { TreeNode } from "../mod.ts";
function isSubStructure(A: TreeNode | null, B: TreeNode | null): boolean {    return Boolean(        A &&            B &&            (helper(A, B) ||                isSubStructure(A.left, B) ||                isSubStructure(A.right, B)),    );}export default isSubStructure;
function helper(A: TreeNode | null, B: TreeNode | null): boolean {    if (!B) return true;    if (!A) return false;    if (A.val !== B.val) return false;    return helper(A.left, B.left) && helper(A.right, B.right);}