February Challenge 2015
Chef and Strange Formula, Chef and Chain, Chef and Equality, Chef and Strings, Let us play with rank list
August Cook-Off 2015
Chef and the Wildcard Matching
February Challenge 2016
Chef and Strange Operations, Devu and a light discussion, Chef-Detective
December Challenge 2017
Chef And his Cake, Chef and Hamming Distance of arrays, Red and blue points, Penalty Shoot-out, Chef And Easy Xor Queries, Total Diamonds, Chef and Universe
November Cook-Off 2017
Skiing, Online Chess, Random Pair
December Cook-Off 2017
Football Match, Minimum SubArray, Beautiful Array
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
January Cook-Off 2018
Multiple of 3, Make array great again, Survive in ChocoLand
February Challenge 2018
Permutation and Palindrome, Chef And The Patents, Chef And His Characters
March Challenge 2018 DIV 1
Pishty and Triangles, Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting
December Challenge 2018 Division 1
Max and Electrical Panel, Chef and Interactive XOR
April Cook-Off 2019 Division 1
Random Game, Pied Piper vs Hooli
Bangladesh