April Challenge 2017
Similar Dishes, Dish Of Life
May Challenge 2017
Courses in an university, Median of adjacent maximum numbers, Chef and his daily routine
June Challenge 2017
A Good Set, Xenny and Coin Rankings
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Chef and Intersection Line, Villages and Tribes, Periodic Palindrome Construction, Chef goes Left Right Left
December Challenge 2017
Santa Delivering Problem, Chef And his Cake, Penalty Shoot-out
September Lunchtime 2017
Chef and Cook-Off Contests
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove, Minion Chef and Bananas
April Challenge 2018 Division 2
Chef and Array (Challenge), Workers
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again
June Challenge 2018 Division 2
Binary Shuffle, Naive Chef
November Challenge 2018 Division 2
Chef and Difficult Contests
India