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// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值）
，这一点在同城约会中也有详细论述
Drag out a search region below and watch the brute-force approach check every point, one by one:
Pak Declares "Open War", Bombs Kabul, Kandahar After Afghanistan Attack