October Mega Cook-Off 2018 Division 2
Ada and the Staircase, Pumping Water, Binary Nim 2
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures, Table Game, Bad Shuffle
December Challenge 2018 Division 1
Max and Electrical Panel, Chef and Interactive XOR
October Challenge 2018 Division 2
Minimize Digitsum, Chef and Serves, Byte to Bit
September Lunchtime 2018 Division 2
Judging Delay, Chef Restaurant
December Lunchtime 2018 Division 1
Choosing from Buckets, Age Calculator
January Challenge 2019 Division 1
A Pizza Slice, Different Neighbours, Distinct Pairs, Yet Another Problem About Sequences, Partition the Graph
February Cook-Off 2019 Division 1
Chef and Secret Password, Chef and Party
March Challenge 2019 Division 1
Cheating on Queue, Yet Again a Subarray Problem
March Cook-Off 2019 Division 1
XOR N-bonacci Sequence, Markers and Caps
August Challenge 2019 Division 1
Dilemma, Maximize an Expression, Guddu and his Mother
December Challenge 2019 Division 1
Chefina and Ranges, Binary XOR, Addition
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Chefina and Prefix Suffix Sums
October Lunchtime 2020 Division 1
Chef Likes Good Sequences
India