November Challenge 2016
Friends Meeting, Urban Development, Gift and Chef, Chef and squares, Sereja and Ways in the Cube, Task for Alexey, Count Permutations
March Challenge 2017
Cooking Schedule, Completing favorite game, Xenny and Alternating Tasks, Pishty and birthday, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
June Cook-Off 2017
Knight Covering, Centeroid, SnackUp, Ada and crayons
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples, Bipartite Graph from Trees
January Challenge 2018
Killing Monsters, Killjee and k-th letter , K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
January Lunchtime 2018
Chef and Game with Sequence, Chef and Escaping from the Labyrinth
Ukraine