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）。
There are five rounds to the game. The first round sees you trying to guess the word, with correct, misplaced, and incorrect letters shown in each guess. If you guess the correct answer, it'll take you to the next hurdle, providing the answer to the last hurdle as your first guess. This can give you several clues or none, depending on the words. For the final hurdle, every correct answer from previous hurdles is shown, with correct and misplaced letters clearly shown.
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他亦負責在空襲前，就「史詩狂怒行動」（Operation Epic Fury）向國會八名最高級別領袖簡報。
魅族手机或将成为历史：业务实质性停摆，3月正式退市
Officers from the City of London police arrested Mukund Krishna and two other national board members.