2012 University of Chicago Qualifying Contest
Problem A - Regular Convex Polygon
Solutions
Source: Problem I from South West European 2011 [Scoreboard]
Problem C - Good or Bad?
Solutions
Source: Problem A from Pacific Northwest America 2011 [Scoreboard]
Problem D - Vive la Difference!
Solutions
Source: Problem D from South East North America 2011 [Scoreboard]
Problem F - Thinking Inside the Box
Solutions
Source: Problem F from South Central North America 2011 [Scoreboard]
Problem G - Repeating Characters
Solutions
Source: Problem A from Greater New York Region 2011 [Scoreboard]
Problem H - Everyone out of the Pool
Solutions
Source: Problem D from East Central North America 2011 [Scoreboard]