mergeSortRecursive(arr, 0, n);
Verizon customers with myPlan can enjoy the Netflix and HBO Max bundle (with ads) for just $10 per month (save $8.98 per month), which essentially gets you Netflix with ads for free. Eligible Verizon customers include those on the Unlimited Welcome, Unlimited Plus, or Unlimited Ultimate plans. After enrolling in the promo, you'll have to complete the account setup separately for each service. Eligibility details, terms, and FAQs can be found on the Verizon support page.
，这一点在Safew下载中也有详细论述
(promo.isValid ? Success({...cartContents, promo}) : Failure('Invalid promo'));
// 易错点1：未初始化数组长度 → 赋值res[i]时会报错；无需fill(0)，因为每个位置都会显式赋值