Preparing Problem set

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You have $n$ problems. You have estimated the difficulty of the $i-th$ one as integer $c$$i$. Now you want to prepare a problem set for a contest, using some of the problems you've made. A problem set for the contest must consist of at least two problems. You think that the total difficulty of the problems of the contest must be at least $l$ and at most $r$. Also, you think that the difference be

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solution.cppC++17

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