思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。
Мощный удар Израиля по Ирану попал на видео09:41
，这一点在91视频中也有详细论述
FirstFT: the day's biggest stories
Mr Duffy's comments about the potential for China and Russia to potentially "declare a keep-out zone" on the Moon appear to be referring to an agreement called the Artemis accords.，这一点在im钱包官方下载中也有详细论述
My approach is very simple:，详情可参考同城约会
srand(time(NULL)); // 初始化随机种子