May Challenge 2020 Division 2
Triple Sort, Binary Land, Sorting Vases, Not a Real World Problem, Coronavirus Spread, Chef and Bitwise Product, (Challenge) Nanobots, Isolation Centers, Buying a New String
June Challenge 2020 Division 2
Chef and Icecream, Chef and Price Control, Chef and String, Covid Sampling (Challenge), Guessing Game, The Delicious Cake, Operations on a Tuple, The Tom and Jerry Game!, Even Matrix
July Challenge 2020 Division 1
LCM Constraints, Chefina and Swaps, Easy Geo xD, Chef and Dragon Dens, Missing a Point, Doctor Chef, Weird Product, Expected Repetitions, Expected Spanning Trees, (Challenge) Dynamic Hull
China