Ciel and Quiz Game

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Chef Ciel is going to organize a quiz game in her restaurant. Ciel has N problems, and she will choose K problems for the quiz game. Every participant has to answer all K problems. Ciel thinks that if a participant solves all K problems correctly, the participant will get bored, and if a participant solves less problems correctly, the participant will feel sad. Therefore, Ciel decides to choose K

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solution.cppC++17

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