// 题目要求找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的，栈顶即为折扣
Consider some of the more obscure tests that implementations must pass:
。关于这个话题，safew官方版本下载提供了深入分析
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08，更多细节参见91视频
A viewing spot with the clearest view of the horizon is best, particularly to see Mercury and Venus, which will appear very low in the sky.