December Challenge 2017
Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays, Total Diamonds
March Challenge 2018 DIV 2
Pishty and Triangles, Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas
February Challenge 2019 Division 2
Chef and Magical Jars, Deputy Chef, Art of Balance, Appy and Contest, Xor Decomposition, Chef and Secret Ingredients, Guess It Right, Manhattan Rectangle
April Challenge 2019 Division 2
Playing with Numbers, Friend or Girlfriend, Maximum Remaining, Subtree Removal, Fencing
May Challenge 2019 Division 1
Ada Rooks 2, Where to Build the Roads
Brazil