November 2009 (Contest X)
Help the DJ, Magic Strings, Help the judge, The LCS Problem Revisited, The Best Box, SudokuX
December 2009 (Contest XI)
Palindromic Numbers, Plant Location, Maze of Digits, Effective Sets, The N Queens Puzzle Revisited, Park tour
January 2010 (Contest XII)
Circle of towers, Cell Phone Towers , Wildcard Matching, Lost Primes
June 2010 Contest
Pricing Tollbooths, Squirrel and chestnut, Prime Pattern, Tidying Posters, Robot Game, Graph Counting
July 2011 Long Contest
Wireless Network, Large Kitchen, A-E Hash Function, Most Popular Friend
August Long Contest 2011
Coloring in Hypercube, Infinite Grid Game, Shortest Circuit Evaluation, Block Drop, Complex Spanning Tree
November Long Contest 2011
Chefs new Pet, New Restaurant, The Postal Service
