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D - 最短路径·一 HihoCoder - 1081 描述万圣节的早上，小Hi和小Ho在经历了一个小时的争论后，终于决定了如何度过这样有意义的一天——他们决定去闯鬼屋！在鬼...

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B - 还是畅通工程 HDU-1233 某省调查乡村交通状况，得到的统计表中列出了任意两村庄间的距离。省政府“畅通工程”的目标是使全省任何两个村庄间都可以实现公路交通（但不一...

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A - How Many Tables HDU-1213 Today is Ignatius' birthday. He invites a lot of friends. ...

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F - Bomb HDU - 3555 The counter-terrorists found a time bomb in the dust. But this time...

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D - The least round way Codeforces Beta Round #2 There is a square matrix n × n, consis...

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B - 不要62 HDU - 2089 杭州人称那些傻乎乎粘嗒嗒的人为62（音：laoer）。杭州交通管理局经常会扩充一些的士车牌照，新近出来一个好消息，以后上牌照，不再含有...

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A - Football POJ-3071 Consider a single-elimination football tournament involving 2n te...

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I - Inversion HDU-6098 Give an array A, the index starts from 1.Now we want to know Bi=...

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H - Rikka with Competition HDU - 6095 As we know, Rikka is poor at math. Yuta is worryi...

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G - Time To Get Up HDU-6077 Your job is to help Little Q read the time shown on his clo...

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F - k-Tree Codeforces Round #247 (Div. 2) Quite recently a creative student Lesha had a...

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E - Arpa’s hard exam and Mehrdad’s naive cheat Codeforces Round #383 (Div. 2) There exi...

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B - Spider Man Codeforces Round #366 (Div. 2) Peter Parker wants to play a game with Dr...

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A - Arithmetic Progression CodeForces - 382C Everybody knows what an arithmetic progres...

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D - New Year and Fireworks CodeForces - 750D One tradition of welcoming the New Year is...

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C - Two Seals CodeForces - 837C One very important person has a piece of paper in the f...

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B - Beru-taxi Codeforces Round #367 (Div. 2) Vasiliy lives at point (a, b) of the coord...

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A - Transformation: from A to B CodeForces - 727A Vasily has a number a, which he wants...