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Yes, this is how it should have been done. Each author being counted once.
The suggestions given in Felix-Halim is also misleading due to this.
Destination Goa wrote:acm.timus.ru has its difficulty rating as num_ac_authors / num_attempted_authors
But I think that num_submits should be raw number to show if the problem "suggests" a lot of WA before one gets 1st AC. It's like a "tricky cases" rating.
It is doubtful question whether to count those raw_num_non_ac before 1st AC from the author. So that only actually stubborn solvers affect the final rating. Or at least not to count num_non_ac from the author unless he made at least 10 submits on this problem.
I.e. I suggest the formula:
% = num_ac_authors / sum(for each author, solved || num_non_ac_author >= 10 ? num_non_ac_author : 0)
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