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this.stack = []; // 核心：存储索引，保证索引对应的价格单调递减
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But no one is ready to say when hundreds of new missile silos, dug from the windswept Great Plains, will be finished, how much they cost, or, for that matter, how many nuclear warheads each Sentinel missile could actually carry.
// 核心逻辑：弹出栈中<=当前值的元素（这些元素不可能是前面元素的"下一个更大值"）