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The organizers of a programming contest have decided to present t-shirts to participants. There are six different t-shirts sizes in this problem: S,M, 阅读全文
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This is an interactive problem. You should use flush operation after each printed line. For example, in C++ you should usefflush(stdout), in Java you 阅读全文
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Vasily exited from a store and now he wants to recheck the total price of all purchases in his bill. The bill is a string in which the names of the pu 阅读全文
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Vasily has a number a, which he wants to turn into a number b. For this purpose, he can do two types of operations: multiply the current number by 2 ( 阅读全文
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Mahmoud and Ehab live in a country with n cities numbered from 1 to n and connected by n - 1 undirected roads. It's guaranteed that you can reach any 阅读全文
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Mahmoud wants to write a new dictionary that contains n words and relations between them. There are two types of relations: synonymy (i. e. the two wo 阅读全文
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Mahmoud wrote a message s of length n. He wants to send it as a birthday present to his friend Moaz who likes strings. He wrote it on a magical paper 阅读全文
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Mahmoud has n line segments, the i-th of them has length ai. Ehab challenged him to use exactly 3 line segments to form a non-degenerate triangle. Mah 阅读全文
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While Mahmoud and Ehab were practicing for IOI, they found a problem which name was Longest common subsequence. They solved it, and then Ehab challeng 阅读全文