Symmetric Stones

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The Spirit of the Sea has held you captive and has agreed to release you if you can do him a favor. The Spirit has given you N numbered pebbles A[i] in a series, one after the other. He said that you can choose any random integers X and Y such that 1<=X<=Y<=N, and you can rearrange the pebbles whose indices i fall within the range (X,Y) (both inclusive) (X<=i<=Y) any way you like such that the E

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solution.cppC++17

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