September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums, Sereja and Commands
October Challenge 2017
Max Mex, A Balanced Contest
December Challenge 2017
Chef And his Cake, Penalty Shoot-out, Total Diamonds
September Cook-Off 2017
Statistics Construction, Subsequence Equality
January Challenge 2018
K-Concatenation, Partition the numbers, String Merging, Rectangle, Maximum Score
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again, Fake Binary Search, Dibs on Fibs
July Challenge 2018 Division 2
Magic Set, Strike or Spare
December Challenge 2018 Division 2
Max and Electrical Panel, Chef and Interactive Contests, Chef and An Ideal Problem
India