June Challenge 2020 Division 2
The Tom and Jerry Game!, Chef and Icecream, Chef and String, Chef and Price Control, Even Matrix
July Challenge 2020 Division 2
Ada King, Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef, Chef and Card Game, Chef and Strings
August Challenge 2020 Division 2
Smallest KMP, Chef and Wedding Arrangements, Chef and Linear Chess, Chef Wars - Return of the Jedi, Subsequence Frequency Counting, Insanely Hard School Exams, Another Card Game Problem
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Divide Candies, Ada Matrix
October Challenge 2020 Division 1
Positive AND, Adding Squares, Compress all Subsegments, D-Dimensional MST, Replace for X, Inversions
November Challenge 2020 Division 1
Chef and the Combination Lock, Restore Sequence, Magical Candy Store, Scalar Product Tree, Unusual Queries
India