May Challenge 2017
Long Sandwich , Gotham PD, Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences, Chef and Sub Array
June Challenge 2017
A Good Set, Xenny and Coin Rankings, Triplets
July Challenge 2017
Whats in the Name, IPC Trainers, Calculator , Pishty and tree, Chef and Sign Sequences
August Long Challenge 2017
Chef and Rainbow Array, Chef And Fibonacci Array, Chef and Mover, Palindromic Game, Greedy Candidates, Strings and Graphs
September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Fill The Matrix, Weasel finds Staircase, Minimum Good Permutation, Sereja and Commands, Weasel does Xor on Tree
August Cook-Off 2017
Tree Connectivity, Matrix and Chef, Real obtuse, From heaven to earth
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
April Lunchtime 2017
Bear and Segments, Bear and Segment 01
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams
February Cook-Off 2019 Division 1
Max Range Queries, Chef and Secret Password, The Most Amazing Dish, Chef in Evil Land, Buying New Tablet, Chef and Party
Poland