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写数字 Time Limit: 2000/1000ms (Java/Others) Problem Description: 把由1开始的自然数依次写下来：123456789101112……，重新分组，按四个数字为一组：1234，5678，9101，1121，3141，5161，…0348…，问第n 阅读全文
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Problem description You have a Petri dish with bacteria and you are preparing to dive into the harsh micro-world. But, unfortunately, you don't have a 阅读全文
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Problem description Mr. Santa asks all the great programmers of the world to solve a trivial problem. He gives them an integer m and asks for the numb 阅读全文
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Problem description Little Petya very much likes arrays consisting of n integers, where each of them is in the range from 1 to 109, inclusive. Recentl 阅读全文
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Problem description Vasya plays the sleuth with his friends. The rules of the game are as follows: those who play for the first time, that is Vasya is 阅读全文
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Problem description It is the middle of 2018 and Maria Stepanovna, who lives outside Krasnokamensk (a town in Zabaikalsky region), wants to rent three 阅读全文
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Problem description New Year is coming in Line World! In this world, there are n cells numbered by integers from 1 to n, as a 1 × n board. People live 阅读全文
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Problem description So, the New Year holidays are over. Santa Claus and his colleagues can take a rest and have guests at last. When two "New Year and 阅读全文
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Problem description Vasya has n pairs of socks. In the morning of each day Vasya has to put on a pair of socks before he goes to school. When he comes 阅读全文
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Problem description Recently, Anton has found a set. The set consists of small English letters. Anton carefully wrote out all the letters from the set 阅读全文