December Challenge 2017
Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays, Chef and Direction
April Challenge 2019 Division 2
Subtree Removal, Fencing, Maximum Remaining, Friend or Girlfriend, Playing with Numbers, Mininum XOR over Tree, Kira Loves Palindromes
May Challenge 2019 Division 1
Ada Rooks 2, Trees and Degrees, Chef and Elephant Tree, Where to Build the Roads, Ada Pawns
Starters 105 Division 1 (Rated till 6 Stars)
Ghoul-icious Goodies, Reaper Reaps, Spooky Sequences, Ghastly Work, Dull Operation, Wishcraft
China