Oleksandr Kulkov

August Challenge 2014

Chef and Gift

October Challenge 2014

Remy paints the fence, Chef and Ground

January Challenge 2015

Chef and Stones, Sereja and Votes, Xor Queries, Gcd Queries

September Challenge 2015

Nikitosh and xor

July Challenge 2016

Andrash and Stipendium, Evaluate the polynomial, Chefland and Electricity

October Challenge 2017

A Balanced Contest, Counter Test For CHEFSUM, Max Mex

November Challenge 2017

Chef goes Left Right Left, Villages and Tribes

April Cook-off 2018 Division 2

Cut the Board

August Challenge 2018 Division 2

Modular GCD, Sheokand and Number

July Lunchtime 2018 Division 2

Split Stones, GCD Sum, Make a String, Prime divisors

August Lunchtime 2018 Division 2

Mix Mix Game, Chef and Eid, Chef and Problem Setting

September Lunchtime 2018 Division 2

Judging Delay, Biased Judgement, Opposite Cites, Chef Restaurant , Match the Streams

March Challenge 2019 Division 1

Yet Again a Subarray Problem, Matchable Permutations

January Lunchtime 2020 Division 1

Construct Array, Under the Tunnels, Folding Paper

March Challenge 2021 Division 1

Dense Graph, Maximum Topological Sort, Locked Safe, Space Arrays, Substring Probability, Paparazzi Gennady, Consecutive Adding

Starters 199 (Rated)

Perfect Ranges, Fence Colouring, Grid MEX, Subtract or Divide, XOR Game

Problems Authored (2)

Problems Tested (8)

Editorials Contributed (69)