September Challenge 2020 Division 2
A Problem on Sticks, Chef and Trump Cards, Find XOR, Rotate the Polyline, Divide Candies, Ada Matrix, Coronavirus Spread 2, Chefina and Swap
October Challenge 2020 Division 2
Chef and Easy Queries, Covid Run, Adding Squares, Compress all Subsegments, Replace for X, Random Knapsack, Positive AND, D-Dimensional MST
November Challenge 2020 Division 1
Unusual Queries, Scalar Product Tree, Magical Candy Store, Restore Sequence, Connect on a Grid (Challenge), Chef and the Combination Lock
January Challenge 2021 Division 1
Chef and Ants, Expected Number of SCCs, Blackjack, And-Or Game
December Challenge 2020 Division 1
Even Pair Sum, Positive Prefixes, Calculus, String Operations, Linear Combination, Square Root of LCA Convolution, Hail XOR, Permutations
February Challenge 2021 Division 1
Team Name, Another Tree with Number Theory, Prime Game, Multiple Games, XOR Sums, Cut the Cake (Challenge), Bash Matrix, Cell Shell
March Challenge 2021 Division 1
Consecutive Adding, Maximum Topological Sort, Locked Safe, Wireless Electricity (Challenge), Space Arrays, Substring Probability, Paparazzi Gennady, Dense Graph
April Challenge 2021 Division 1
Binary String MEX, Tree Permutations, Worthy Matrix, Destroy the EMP Chip, Chef and Pair Flips, Chef and Dice, Boolean Game
