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题目： Mikhail walks on a 2D plane. He can go either up or right. You are given a sequence of Mikhail’s moves. He thinks that this sequence is too long and he wants to make it as short as possible. In th...

题目： You are given a string s consisting of n lowercase Latin letters. You have to type this string using your keyboard. Initially, you have an empty string. Until you type the whole string, you may pe...