February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks
May Challenge 2017
Chef and his daily routine
June Challenge 2017
A Good Set, Xenny and Coin Rankings
September Challenge 2017
Little Chef and Sums, Minimum Good Permutation, Chef and Pick Digit
October Challenge 2017
Max Mex, A Balanced Contest
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
June Challenge 2019 Division 2
Road Signs, Chef and Proxy
May Challenge 2020 Division 2
Coronavirus Spread, Isolation Centers
June Challenge 2020 Division 2
Chef and Icecream, Chef and Price Control, Chef and String, The Tom and Jerry Game!, Even Matrix
June Cook-Off 2022 Division 3 (Rated)
Break the Stick, First and Last
June Long One 2022 Division 3 (Rated)
Subscriptions, Divisible by i , Possible GCD, Alternate Additions
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