May Challenge 2013
Name Reduction, Your Name is Mine
November Challenge 2013
Uncle Johny, Missing some chairs
June Challenge 2014
Chef and Subarray, Guessing Game
November Challenge 2014
Distinct Characters Subsequence, Let us construct palindrome
January Challenge 2015
Chef and Stones, Sereja and Votes
August Challenge 2018 Division 2
Problem Sort, Spell Bob, Sheokand and Number
August Challenge 2019 Division 2
Dilemma, Football, Distribute Apples, Zombie and the Caves
September Challenge 2019 Division 2
Easy Fibonacci, Chef and Interesting Subsequences
September Challenge 2020 Division 2
A Problem on Sticks, Ada Matrix
December Challenge 2020 Division 2
Even Pair Sum, Vaccine Production, Vaccine Distribution
Estonia