September Challenge 2020 Division 2
A Problem on Sticks, Chefina and Swap, Coronavirus Spread 2, Ada Matrix, Chef and Trump Cards, Find XOR
October Challenge 2020 Division 1
Inversions, Positive AND, Replace for X, Adding Squares
December Lunchtime 2020 Division 1 (Unrated)
Even Sequence, Three Letters, One Zero Swaps
January Lunchtime 2021 Division 2 (Unrated)
Dreams of Divisibility, Even Sum, Even Differences, Binary Subsequence, Shifting Spoons, Good Grid
November Cook-Off 2020 Division 1
Flip the String, Chef and IPC Certificates, Hiring Workers
October Lunchtime 2020 Division 1
Chef Likes Good Sequences, Chef Is Just Throwing Random Words, Cute Chef Gift
September Cook-Off 2020 Division 2
Bulbs and Wires, Bowling Strategy, Maximise Subsequence Value
UWCOI 2021 (Rated for all)
Organisation, Array Swaps, Hidden Numbers
February Lunchtime 2021 Division 2
Average Sorting, Palpal Strings, Coprime Range
March Lunchtime 2021 Division 2
Lunchtime, Racing, Dinner by Candlelight
May Challenge 2021 Division 2 (Rated)
Tree House, Xor Equality, Tic Tac Toe, Modular Equation
June Lunchtime 2021 Division 2
From Rational to Binary, False Number, Unpleasant Ones, Tic Tac Toe
July Challenge 2021 Division 1 (Unrated)
XxOoRr, Chef vs Bharat, Optimal Denomination
India