April Challenge 2019 Division 2
Mininum XOR over Tree, Playing with Numbers, Friend or Girlfriend, Maximum Remaining, Subtree Removal, Fencing, Moving Rectangles (Challenge), Kira Loves Palindromes
September Challenge 2019 Division 2
Easy Fibonacci, (Challenge) Sebi and CPU Design, Chef and Interesting Subsequences , Chef Designed a Network, Doofish Set, Fuzzy Linear Combinations, Biladerim Icin, Chef and Good Subsequences
October Challenge 2019 Division 1
Array Modification, Chef and Maximum Star Value, Even Edges, Bacterial Reproduction
November Challenge 2019 Division 1
Physical Exercise, Smallest Beautiful Number, From Zero to Infinity, Single Point of Failure, (Challenge) Coloring Triangulations
December Challenge 2019 Division 1
Scoring Pairs, Addition, (Challenge) Cubical Virus, Test Generation, Sticky Notes, Binomial Fever, Binary XOR, Chefina and Ranges
Starters 71 Division 1 (Unrated)
Pet Store, Flip the Prefix, Expected Sum, Maximizing LCS, Smallest Difference
China