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You are given two strings ss and tt, both consisting only of lowercase Latin letters. The substring s[l..r]s[l..r] is the string which is obtained by 阅读全文
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Katya studies in a fifth grade. Recently her class studied right triangles and the Pythagorean theorem. It appeared, that there are triples of positiv 阅读全文
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Description The most important part of a GSM network is so called Base Transceiver Station (BTS). These transceivers form the areas called cells (this 阅读全文
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People in Silverland use square coins. Not only they have square shapes but also their values are square numbers. Coins with values of all square numb 阅读全文