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Description Heidi's friend Jenny is asking Heidi to deliver an important letter to one of their common friends. Since Jenny is Irish, Heidi thinks tha 阅读全文
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Description The marmots have prepared a very easy problem for this year's HC2 – this one. It involves numbers n, k and a sequence of n positive intege 阅读全文
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Description Your search for Heidi is over – you finally found her at a library, dressed up as a human. In fact, she has spent so much time there that 阅读全文
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Description The crowdedness of the discotheque would never stop our friends from having fun, but a bit more spaciousness won't hurt, will it? The disc 阅读全文
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Description Nadeko's birthday is approaching! As she decorated the room for the party, a long garland of Dianthus-shaped paper pieces was placed on a 阅读全文
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Description Sengoku still remembers the mysterious "colourful meteoroids" she discovered with Lala-chan when they were little. In particular, one of t 阅读全文
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Description A few years ago, Hitagi encountered a giant crab, who stole the whole of her body weight. Ever since, she tried to avoid contact with othe 阅读全文
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Problem Description A school bought the first computer some time ago(so this computer's id is 1). During the recent years the school bought N-1 new co 阅读全文