September Challenge 2016
Faded Palindromes, Chef and calculation, Chef and digits of a number
October Challenge 2016
Sereja and Progressions, Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs
February Challenge 2017
Chef and His Apartment Dues, Most Frequent Element, Gerrymander
March Challenge 2017
Bandwidth of a matrix, (CH) Bear and Sorted Rows, Bear and Extra Number, Xenny and Alternating Tasks
April Challenge 2017
Dish Of Life, Bear and Row 01, Bear and Clique Distances, Similar Dishes
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
India