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A big marathon is held on Al-Maza Road, Damascus. Runners came from all over the world to run all the way along the road in this big marathon day. The 阅读全文
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Some natural number was written on the board. Its sum of digits was not less than k. But you were distracted a bit, and someone changed this number to 阅读全文
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Two boys decided to compete in text typing on the site "Key races". During the competition, they have to type a text consisting of s characters. The f 阅读全文
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A. The Useless Toy time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Walking through the street 阅读全文
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It's hard times now. Today Petya needs to score 100 points on Informatics exam. The tasks seem easy to Petya, but he thinks he lacks time to finish th 阅读全文
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It's one more school day now. Sasha doesn't like classes and is always bored at them. So, each day he invents some game and plays in it alone or with 阅读全文
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There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabe 阅读全文