August 2009 (Contest VI)
Bytelandian Robots, Curry Stained Napkin, Golf course, Crystals, Magic sequence
December Challenge 2015
Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Chef and Filters
May Challenge 2017
Chef and his daily routine, Chef and Battleship, Chef and Subsequences, Median of adjacent maximum numbers, Blocked websites, Courses in an university, Gotham PD, Long Sandwich , Chef and Sub Array
June Challenge 2017
Chef and Prime Queries, Saboteur (Challenge), A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
