May Cook-Off 2020 Division 2
Impressing Chefina, Chef and Recipe, Roads in Chefland, Chef, Chefina and Their Friendship
May Lunchtime 2020 Division 2
Weird Walk, Convert the String, Lost Weekends
June Challenge 2020 Division 1
Convenient Airports, Chef and Price Control, Chef and String, Covid Sampling (Challenge), Chef and Icecream, Guessing Game, The Delicious Cake, Operations on a Tuple, The Tom and Jerry Game!, Even Matrix
August Challenge 2020 Division 1
Chef and Wedding Arrangements, Chef Thanos Wants Perfect Balance, Smallest KMP, Insanely Hard School Exams, Subsequence Frequency Counting
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Move the Coins - Creating Tests, Divide Candies, Vibrating Paths (Challenge), Ada Matrix
October Challenge 2020 Division 1
Inversions, Compress all Subsegments, D-Dimensional MST, Replace for X, Rooted Minimum Spanning Tree, Positive AND
November Challenge 2020 Division 1
Restore Sequence, Magical Candy Store, Scalar Product Tree, Unusual Queries
India