July Challenge 2020 Division 2
Chefina and Swaps, Missing a Point, Doctor Chef, Chef and Card Game, Chef and Strings, Ada King
August Challenge 2020 Division 2
Chef and Wedding Arrangements, Smallest KMP, Chef and Linear Chess, Another Card Game Problem, Chef Wars - Return of the Jedi, Subsequence Frequency Counting, Insanely Hard School Exams
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Ada Matrix
October Challenge 2020 Division 1
Inversions, Positive AND, Replace for X, D-Dimensional MST, Adding Squares
January Challenge 2021 Division 2
Cool Subsets, Guess the Tiling
