November Challenge 2016
Chef and squares, Task for Alexey, Count Permutations
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
May Challenge 2017
Courses in an university, Chef and Subsequences, Median of adjacent maximum numbers, Blocked websites, Chef and his daily routine, Chef and Sub Array
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
January Challenge 2018
K-Concatenation, Partition the numbers, Maximum Score, Rectangle
February Challenge 2018
Broken Clock, Chef And His Characters, Chef And The Patents, Car-pal Tunnel, (Challenge) Biased Committee, Permutation and Palindrome
December Challenge 2018 Division 1
Directing Edges, Chef and Interactive XOR
December Challenge 2019 Division 2
Plus Multiply, Binary XOR, That Is My Score!, Addition
September Lunchtime 2020 Division 2
GCD operations, Watermelon
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