Four Numbers

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Problem description. Jayant is interested in sequences. He has an array A of size N.He wants to know how many subsequences are there of size 4 which are in strictly decreasing order. So he asked you for your help. Can you tell him the answer? Input The first line contains N (Size of array A) Second line contains N space-separated integers (elements of array A). Output Output a single intege

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solution.cppC++17

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