April Challenge 2019 Division 2
Playing with Numbers, Friend or Girlfriend, Maximum Remaining, Subtree Removal, Fencing, Kira Loves Palindromes
June Challenge 2019 Division 2
Road Signs, Chef and Proxy, Guddu on a Date, Sum and GCD
August Challenge 2019 Division 2
Distribute Apples, Zombie and the Caves, Football, Chef and Gordon Ramsay, Dilemma
September Challenge 2019 Division 2
Chef and Good Subsequences, Easy Fibonacci, Doofish Set, Chef Designed a Network, Chef and Interesting Subsequences
October Challenge 2019 Division 1
Even Edges, Bacterial Reproduction, Chef and Maximum Star Value, Array Modification
December Challenge 2019 Division 1
Chefina and Ranges, Addition, Binary XOR, Sticky Notes
February Challenge 2020 Division 1
Chef and Railway Stations, Expected Change, No Change Required, Long Contest and Cook Off Overlaps
March Challenge 2020 Division 1
Chef and DAG, Winning Ways 2, Lasers Everywhere, Inverse of a Function, Lasers Everywhere Alternative
April Challenge 2020 Division 1
Strange Number, Leaked Answers (Challenge), Factor Tree, Ready Bitwise, Perfect Power Divisors, Squared Subsequences
August Challenge 2020 Division 1
Subsequence Frequency Counting, Smallest KMP, Chef and Wedding Arrangements
November Challenge 2020 Division 1
Restore Sequence, Scalar Product Tree
Peru