AK and 3N Sequences

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You are given a sequence of length $3N$ $P$. Your task is to construct a sequence $Q$ of length $2N$, by removing $N$ elements from $P$ and without changing the order of the elemnts in $P$. The value $D$ is given by :- $D$ = ( Sum of elements in the first half of the array ) - ( Sum of elements in the second half of the array ) You have to find the maximum possible value of $D$ in the

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solution.cppC++17

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