Productivity

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You are given a sequence of integers A1, A2, A3...AN. Find the highest possible value of (Ai - Aj) * (Ai + Aj). Input The first line of the input contains an integer T denoting the number of test cases. The description of T test cases follows. - The first line of a test case contains an integer N. - The second line of a test case contains an array of N elements. Output For each test case, ou

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solution.cppC++17

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