Allocating Covid Beds

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A country has total $B$ Covid Beds under its control.There are total $N$ states in the country.Each state can demand at most $Ki$, $1 \leq i \leq N $ beds so that they can successfully use them for treatment of Covid Patients. Now,head of the country wants to allocate all the $B$ beds to different states. He wants to know the number of ways to do so.Each state might also get 0 beds.Help him!

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solution.cppC++17

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