Sticks

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Chef and his little brother are playing with sticks. Initially, Chef has $N$ sticks with lengths $A_1, A_2, \dots, A_N$. He should give his little brother at least $K$ of these sticks. Afterwards, Chef's brother should choose four sticks and use them to form a rectangle (a square is also a rectangle). Chef does not want his brother to break any of the sticks, so each of the chosen sticks should be

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solution.cppC++17

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