September Challenge 2016
Chef and digits of a number
October Challenge 2016
Sereja and Progressions, Chef and Keyboard, Chef and Three Dogs
February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
January Cook-Off 2017
Digit Longest Increasing Subsequences 2
April Challenge 2017
Dish Of Life, Bear and Row 01, Similar Dishes
May Challenge 2017
Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
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