April Challenge 2012
Double Strings, Stacking Pancakes, Greatest Dumpling Fight, Fit to Play
May Challenge 2012
Digits Forest, Little Elephant and Median, Jewels and Stones, Lucky lucky number, Divisible Pairs, Remember the recipe, A Home for Chef
September Challenge 2017
Sereja and Commands, Sereja and Functions (Challenge), Chef and Pick Digit, Minimum Good Permutation, Sum of Cubes, Weasel does Xor on Tree, Fill The Matrix, Little Chef and Sums
October Challenge 2017
(Challenge) Connecting computers, Chef and a great voluntary Program, A Balanced Contest, Counter Test For CHEFSUM, Shooting on the array, Chef and Cycled Cycles, Chef and Magic Arrays, Max Mex
March Challenge 2018 DIV 1
Pishty and Triangles, Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting, Embedding a Tree (Challenge)
September Challenge 2018 Division 1
AND Square Subsegments, Bad Shuffle, Table Game, Chef and Condition Zero (Challenge), Sasha and Photos
October Challenge 2018 Division 1
Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, Coprime Components
