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题目链接 题目 This is simplified version of the problem used on the original contest. The original problem seems to have too difiicult solution. The constra 阅读全文
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题目链接 题目 Everyone knows that long ago on the territory of present-day Berland there lived Bindian tribes. Their capital was surrounded by n n n hills, 阅读全文
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题目链接 题目 This is yet another problem dealing with regular bracket sequences. We should remind you that a bracket sequence is called regular, if by inse 阅读全文
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比赛总结 分数：100+100+48+30 个人认为，T2乱搞竟然是正解，而T3看到 \(10^7\) 就一直在想 \(O(n)\) 做法，但其实打 \(O(n\log n)\) 就行了。 而当时我在赛场上懒得打 \(O(n\log n)\)，就随便糊了一个 \(O(n\sqrt n)\) 的做法上 阅读全文