Cube Towers

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Besides numbers Alice also likes to play with cubes of letters. She has infinite supply of the cubes with every lowercase Latin letter written on it. So she often builds the towers from her cubes. Specifically, there are N initially empty towers of cubes. Step-by-step, Alice picks a cube and puts it to the top of some of the towers. Sometimes she becomes curious about how many towers contain

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solution.cppC++17

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