February Challenge 2015
Let us play with rank list, Chef and Equality, Chef and Chain
March Challenge 2015
Chef and Notebooks, Sign Wave
April Challenge 2015
Chef and Interview, Broken Telephone, Chef and Piano Scales
May Challenge 2015
Chef and Prime Divisors, Chef and new recipe
July Challenge 2015
Bread, Na2a and lucky stone, Chef and Cube
May Cook-Off 2015
Devu and friendship testing
September Lunchtime 2015
Sum of palindromic numbers
March Challenge 2016
Palindromic substrings, maximize the sum, Chef And Special Dishes
April Challenge 2016
Chef And Coloring, Chef And Magical Path, Help Watson Escape, Chef and Ballons
June Challenge 2016
Chef And Binary Operation, Chef and Coins Game, Devu and an Array
July Challenge 2016
Andrash and Stipendium, Chefland and Electricity
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
April Challenge 2017
Dish Of Life, Bear and Row 01, Similar Dishes
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
February Challenge 2020 Division 2
School of Geometry, Hard Cash
May Challenge 2020 Division 2
Coronavirus Spread, Isolation Centers
India