May Challenge 2019 Division 2
Reduce to One, Where to Build the Roads, Matches
August Challenge 2019 Division 2
Guddu and his Mother, Encoding, Dilemma, Chef and Gordon Ramsay, Football, Distribute Apples, Zombie and the Caves
October Challenge 2019 Division 1
Bacterial Reproduction, (Challenge) Maximizing LIS, Array Modification, Chef and Maximum Star Value, Even Edges
November Challenge 2019 Division 1
Physical Exercise, Smallest Beautiful Number, From Zero to Infinity, Single Point of Failure
April Challenge 2020 Division 1
Strange Number, Squared Subsequences
October Challenge 2020 Division 1
D-Dimensional MST, Compress all Subsegments
Taiwan