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Problem description Xenia the beginner mathematician is a third year student at elementary school. She is now learning the addition operation. The tea 阅读全文
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Problem description Little Petya loves presents. His mum bought him two strings of the same size for his birthday. The strings consist of uppercase an 阅读全文
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Problem description As you may know, MemSQL has American offices in both San Francisco and Seattle. Being a manager in the company, you travel a lot b 阅读全文
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Problem description Programmer Rostislav got seriously interested in the Link/Cut Tree data structure, which is based on Splay trees. Specifically, he 阅读全文
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Problem description Consider the infinite sequence of integers: 1, 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 5.... The sequence is built in the following 阅读全文