Group Sum

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The positive even numbers are sorted in ascending order as 2, 4, 6, 8, 10, 12, 14, 16 ……, and grouped as (2), (4, 6), (8, 10, 12), (14, 16, 18, 20) and so on. Thus, the first group is (2), the second group is (4, 6), the third group is (8, 10, 12), etc. In general, the kth group contains the next k elements of the sequence. Given $k$, find the sum of the elements of the $kth$ group. ###Input:

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solution.cppC++17

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