September Challenge 2014
Fun with Rotation, Chef and Left-Right
October Challenge 2014
Remy paints the fence, Sereja and two strings, Chef and Ground, Chef and Painting, Chef and Square, Magical Girl and Colored Liquid Potions, DevuLand, Dinosaurs and Laddus
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome
February Challenge 2020 Division 2
School of Geometry, Long Contest and Cook Off Overlaps, (Challenge) Raisins, Hard Cash, The Theatre Problem, No Change Required
March Challenge 2020 Division 1
Chef and DAG, Lasers Everywhere, Lasers Everywhere Alternative, (Challenge) 300 IQ Ants
May Challenge 2020 Division 1
Buying a New String, Triple Sort, Chef and Bitwise Product, (Challenge) Nanobots
February Cook-Off 2020 Division 2
XOR Game, Penalty Shoot-Out II, Tax Slabs
Russia