December Challenge 2018 Division 2
Chef and Interactive Contests
February Challenge 2019 Division 2
Chef and Secret Ingredients
April Challenge 2019 Division 2
Playing with Numbers, Friend or Girlfriend, Maximum Remaining, Subtree Removal, Fencing
May Challenge 2019 Division 2
Reduce to One, Where to Build the Roads, Matches, Ada Rooks 2
September Challenge 2019 Division 2
Chef and Good Subsequences, Easy Fibonacci, Chef Designed a Network, Chef and Interesting Subsequences
December Challenge 2019 Division 1
Chefina and Ranges, Binary XOR
January Challenge 2020 Division 1
(Challenge) Building Anthills, English, Doraemon, Chef and Dynamo, Chefina and Prefix Suffix Sums
February Challenge 2020 Division 1
Chef and Railway Stations, No Change Required, Long Contest and Cook Off Overlaps
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Ready Bitwise, Leaked Answers (Challenge)
March Cook-Off 2020 Division 1
Mysterious Sequence, Maximize Letter Beauty
August Challenge 2020 Division 1
Smallest KMP, Chef and Wedding Arrangements
August Cook-Off 2020 Division 1
Red-blue Trees, Polygon Relationship
September Cook-Off 2020 Division 1
Maximise Subsequence Value, Minimum Insertions
September Lunchtime 2020 Division 1
Root the Tree, Robot Detector
Code Ensemble (Rated for Division 2)
Cherry and Bits, Cherry and Pyramid, Priya and AND, Traversing Trees
Peru