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Lately the communication between planets has been an important issue, which is why the Earth has made many efforts to be connected to every other plan 阅读全文
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Jeronimo the bear loves numbers and he is planning to write n numbers in his notebook. After writing the first m numbers, Jeronimo felt that he was sp 阅读全文
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A polygon is a plane figure that is bounded by a finite amount of straight line segments closing in a loop to form a closed polygonal chain. The segme 阅读全文
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Alex has two magic machines A and B. Machine A will give you 2x + 1 coins if you insert x coins in it, machine B will give you 2x + 2. Alex has no coi 阅读全文