April Challenge 2017
Bear and Row 01, Bear and Clique Distances, Similar Dishes, Dish Of Life
May Challenge 2017
Chef and Sub Array , Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
June Challenge 2017
Saboteur (Challenge), Pairwise union of sets, Triplets, Xenny and Coin Rankings, Chef and the Feast, A Good Set, Chef and Prime Queries
IOPC 2017 (Rated)
The Birthday Tears, Max Out
June Challenge 2018 Division 1
Two Flowers, Vision, Ways to Work, Archi and Tree
Poland