Meh. Yes, I noticed that I am breaking records on taking very long to finish editorials. I am still having some health issues, unfortunately. I took measures and decided that for SRM 575 the admins should find a replacement to write the editorial :(. I really hope/wish I'll get better for the next SRM.
This problem is nice, it is also something I could have never, ever solved during the contest. I just had no idea of ranks, and I keep forgetting about Gauss elimination.
Here it is: http://apps.topcoder.com/wiki/display/tc/TCO+2013+Round+2A#TheMagicMatrix
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