Chef and Time Machine

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Chef spent N days working really hard! He planned loads of tasks: as many as Ai tasks to do on the ith day! Chef's work was brutal, so he only managed to finish Bi tasks on the ith day. The good news is that Chef has a Time Machine! The Time Machine has K white buttons and M black buttons. Each button has a positive integer printed on it. Now Chef goes through all N days consequently and presses

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solution.cppC++17

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