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Problem DescriptionNowadays we use content of PM2.5 to discribe the quality of air. The lower content of PM2.5 one city have, the better quality of ai... 阅读全文
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There arenImperial stormtroopers on the field. The battle field is a plane with Cartesian coordinate system. Each stormtrooper is associated with his ... 阅读全文
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Drazil has many friends. Some of them are happy and some of them are unhappy. Drazil wants to make all his friends become happy. So he invented the fo... 阅读全文
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Drazil is playing a math game with Varda.Let's definefor positive integerxas a product of factorials of its digits. For example,.First, they choose a ... 阅读全文
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Someday, Drazil wanted to go on date with Varda. Drazil and Varda live on Cartesian plane. Drazil's home is located in point(0, 0)and Varda's home is ... 阅读全文
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Anya has bought a new smartphone that usesBerdroidoperating system. The smartphone menu has exactlynapplications, each application has its own icon. T... 阅读全文
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Little Tanya decided to present her dad a postcard on his Birthday. She has already created a message — stringsof lengthn, consisting of uppercase and... 阅读全文
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Vitaly is a diligent student who never missed a lesson in his five years of studying in the university. He always does his homework on time and passes... 阅读全文
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A and B are preparing themselves for programming contests.An important part of preparing for a competition is sharing programming knowledge from the e... 阅读全文
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A and B are preparing themselves for programming contests.B loves to debug his code. But before he runs the solution and starts debugging, he has to f... 阅读全文