February Challenge 2017
Chef and His Apartment Dues, Most Frequent Element, Chef and Triangles
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
April Challenge 2017
Similar Dishes, Bear and Row 01, Dish Of Life
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Xenny and Coin Rankings
September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Minimum Good Permutation
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function
IOPC 2017 (Rated)
The Birthday Tears, Max Out
February Challenge 2018
Chef And His Characters, Chef And The Patents
March Challenge 2018 DIV 2
Minion Chef and Bananas, Minions and Voting, Mix the Colors, A Big Sale, Chef and Glove
March Cook-off 2018 Division 2
Chef Judges a Competition
August Cook-Off 2018 Division 2
Mixi Game, Balsa For The Three
August Challenge 2018 Division 2
Problem Sort, Spell Bob, Sheokand and Number
August Lunchtime 2018 Division 2
Chef and Problem Setting, Chef and Eid
February Challenge 2019 Division 2
Chef and Secret Ingredients, Appy and Contest
India