March Challenge 2018 DIV 2
Chef and Easy Problem, Chef and Gcd Queries, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas, Pishty and Triangles
November Challenge 2019 Division 2
Physical Exercise, Hard Sequence, Weapon Value, Chef and Minimum Colouring
November Lunchtime 2019 Division 2
Planting Trees, Compress the List, Washing Windows, Pizza or Broccoli
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Chefina and Prefix Suffix Sums
March Challenge 2020 Division 1
Chef and DAG, Lasers Everywhere, Lasers Everywhere Alternative
April Challenge 2020 Division 1
Leaked Answers (Challenge), Factor Tree, Ready Bitwise, Squared Subsequences, Strange Number, Perfect Power Divisors
May Challenge 2020 Division 1
Triple Sort, Chef and Bitwise Product
February Cook-Off 2020 Division 1
Maximum Subsequence Sum, XOR Game
May Lunchtime 2020 Division 1
Convert the String, Tree difference
July Challenge 2020 Division 1
Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef
August Challenge 2020 Division 1
Smallest KMP, Chef and Wedding Arrangements
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Ada Matrix
June Lunchtime 2020 Division 1
Maximum AND, Gold Mining, Square Submatrices
January Lunchtime 2021 Division 2 (Unrated)
Good Grid, Dreams of Divisibility, Binary Subsequence, Even Differences, Even Sum
Kazakhstan