April Challenge 2014
Farmer Feb, Shortest Path in Binary Trees
June Challenge 2014
Chef and Subarray, Guessing Game
November Challenge 2014
Distinct Characters Subsequence
December Challenge 2014
XOR with Subset, Chef and Apple Trees
January Challenge 2015
Sereja and Number Division 2, Chef and Stones, Sereja and Votes, Gcd Queries
February Challenge 2015
Chef and Equality, Chef and Chain
February Lunchtime 2016
Chef and Socks, Chef and Tic-Tac-Toe
February Lunchtime 2017
Bear and Milky Cookies, Bear and House Queries
May Challenge 2017
Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
June Lunchtime 2017
Maximum Unique Segment, Two Numbers
Turkmenistan