F - Pair Sum

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You are given an array $a1,a2,…,aN$ of length N. Find the sum of |ai - aj| for all pairs of indexes (i, j) (1Test case 1: Sum is equal to = |1 - 2| + |1 - 3| + |2 - 3| = 1 + 2 + 1 = 4 Test case 2: Sum is equal to = |4 - 5| + |4 - 10| + |4 - 14| + |5 - 10| + |5 - 14| + |10 - 14| = 35

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solution.cppC++17

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