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。关于这个话题，爱思助手下载最新版本提供了深入分析
福建—宁夏，结下的“山海情”历久弥新。
Valentine's Dinner
思路：倒序单调栈。弹出所有 ≤ 当前身高的元素（这些人都能被看到），count 为弹出数量；若栈非空，还能看到栈顶（第一个更高的人），故 +1。能看到的人数 = count + (栈非空 ? 1 : 0)。