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Well, I was slightly wrong about the "replace if larger" bit since I was misreading the problem, but yeah.

If you're trying to use C rather than C++, then sorting your array may be the best move...

Showing a bit of the test data might be helpful.

Are you allowed to use a std::map? If so, that would probably be the easiest way to handle the problem. For instance, a map<int,int> could map...

Well, my first question is, why does your struct contain arrays? I see no need for that in the problem description. I'm assuming each measured_data_t would have only 1 site_id_num, not 4, for...