May Challenge 2020 Division 1
Triple Sort, Binary Land, Sorting Vases, Not a Real World Problem, Chef and Rainbow Road, Chef and Bitwise Product, Buying a New String
April Cook-Off 2020 Division 2
Matrix Decomposition, Lift Requests, Simple Operations
May Cook-Off 2020 Division 1
Roads in Chefland, Chef, Chefina and Their Friendship
April Lunchtime 2020 Division 2
Another Birthday Present!, Positive Mex, Chef in Fantasy League
May Lunchtime 2020 Division 1
Convert the String, Tree difference
RECode 12.0 (Rated for all)
Chef and String, Chef and Walk, Chef and Rotation, Chef and Subsequences, Chef and Numbers
