November Challenge 2014
Chef and Segment Game, Let us construct palindrome, Distinct Characters Subsequence, Chef and Red Black Tree
January Challenge 2015
Chef and Stones, Sereja and Votes
May Challenge 2015
Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe
May Cook-Off 2015
Devu and friendship testing
November Challenge 2016
Count Permutations, Gift and Chef, Chef and squares, Task for Alexey
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues, Gerrymander
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
October Challenge 2017
Max Mex, A Balanced Contest
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle
July Cook-Off 2018 Division 2
Encoding Message, OR Matrix
August Challenge 2018 Division 2
Sheokand and Number, Spell Bob, Problem Sort, Modular GCD
December Challenge 2018 Division 2
Max and Electrical Panel, Directing Edges, Chef and Interactive XOR, Chef and Meatballs, Chef and Interactive Contests, Chef and An Ideal Problem
November Challenge 2018 Division 2
Good Median, Chef and Difficult Contests, Chef and Happiness
December Lunchtime 2018 Division 2
Print Pattern, Choosing from Buckets
