October Challenge 2014
Chef and Ground, Magical Girl and Colored Liquid Potions, DevuLand, Dinosaurs and Laddus
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree
January Challenge 2015
Sereja and Number Division 2, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Chef and Chain, Let us play with rank list, Chef and Equality
October Challenge 2015
Time measure, Who dares to be a millionaire, Rupsa and Equilateral Triangle
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again, Dibs on Fibs
India