I remember back in 2004-2005 Usaco had blue-orange-green sections and the green division problems were quite rich of flow poblems. Also they had nice Editorials as usual. In CF I saw couple of threads asking for old Usaco problems and people were referring to many other sites. I was wondering if you have link/archive of those old Editorials.
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Editorials are available after November 2005,contest.usaco.org/NOV05 for November analyses
But where I can find the statements of these problems?
Many can be found on online judges. When I was doing practice i went by the following guide: