Christmas Gifts

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Mr. Kapoor is a very kind man, and has promised to send Christmas gifts to all $N$ kids in his village. But he should give *at most 1* gift to each kid. Mr. Kapoor buys $M$ gifts in total. Each gift is in the form of a box, the size of the $i^{th}$ gift is $s_i$. However, each kid in the village has a certain expectation regarding the size of the gift he/she receives. In other words, the $i^{t

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solution.cppC++17

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