Reselling Items

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Chef is trying to buy some items from a store, and then resell them elsewhere to make a profit. For the $i$-th item, Chef knows that he can resell it for $A_i$ coins. The store has an ongoing offer. The first $K$ items that Chef buys will be offered at a discount of $5$ coins each, but the remaining items will all be offered at $10$ coins each. Chef can choose to buy any number of items, and in

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solution.cppC++17

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