Sum to square

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You will be give a sequence $A$ with $N$ elements. Then you will be given $Q$ queries, you have to process those $Q$ queries. Every query contains two space separated integers $L$ and $R$. Then you have to find the sum of all elements in the range $L$ and $R$. Consider two integers $P$ and $Q$.Indexing of sequence is from 1 through N. Find whether the $SUM$ can be expressed as $P^2-Q^2$

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solution.cppC++17

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