September Challenge 2017
Chef and Pick Digit, Sereja and Commands, Little Chef and Sums, Fill The Matrix, Minimum Good Permutation, Weasel does Xor on Tree
September Cook-Off 2017
Infinite OR Game, Statistics Construction, Subsequence Equality
December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
March Challenge 2019 Division 2
Chef got Recipes, (Challenge) Interleaving Strings, Chef and a Beautiful Digit, Yet Again a Subarray Problem, Chef and Number Game, Cheating on Queue
June Challenge 2020 Division 2
Chef and Price Control, Chef and String, Chef and Icecream, Even Matrix, The Tom and Jerry Game!
August Challenge 2020 Division 2
Subsequence Frequency Counting, Chef Wars - Return of the Jedi, Another Card Game Problem, Chef and Linear Chess, Smallest KMP, Chef and Wedding Arrangements
September Challenge 2020 Division 1
Chef and Trump Cards, Ada Matrix, Find XOR, Chefina and Swap
November Challenge 2020 Division 2
Restore Sequence, Ada and Dishes
September Challenge 2021 Division 2 (Unrated)
XOR Equal, Shuffling Parities, Airline Restrictions, Travel Pass
United States