Here's a test case to make this fail =)

std::array<int, 6 * 10> alol = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
                                0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19,
                                0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
Assert::That(solve(alol), Equals(190));

(can be easily generated for any maxControl)

Relatable

What a nice contributor! Sorry for being rude, cause am new to sql. I acturally spent a lot of time on this problem, and after reading others' solution, it finally came out that I didn't thoroughly understand the question. Hope the problem illustration can be splified. I think less words and hints between texts more obvious can make me better focus on solving problem rather than trying to understand the question. Thx for your kindly reply:)

Thanks for your detailed and well-thought out feedback! Why not look at the other submitted solutions and re-examine your approach ^____^ Have a nice day.

What a bad question!