// 入栈后栈仍保持单调递增（因为小的都被弹走了）
* 核心思路：单调递增栈 + 控制删除位数（k0），优先移除高位大数，保证剩余数字最小，这一点在同城约会中也有详细论述
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The network also underpins the fan experience, from ticketing and stadium maps, to cashless payments for drinks, food and merchandise.
Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.