September Challenge 2019 Division 2
Easy Fibonacci, Chef and Interesting Subsequences , Chef and Good Subsequences
October Challenge 2019 Division 2
Even Edges, Missing Number, Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices
November Challenge 2019 Division 2
Hard Sequence, Chef and Minimum Colouring, Weapon Value, From Zero to Infinity, Smallest Beautiful Number, Physical Exercise
December Challenge 2019 Division 1
Chefina and Ranges, Binary XOR, Sticky Notes, Addition
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Chefina and Prefix Suffix Sums, English
India