April Challenge 2020 Division 2
Squared Subsequences, Strange Number, COVID Pandemic and Long Queue, Unit GCD, Sell All the Cars
March Lunchtime 2020 Division 2 (Unrated)
Maximize LCM, Strip in a Tree!, Chef Swaps Digits, Good Prefix
June Challenge 2020 Division 2
Chef and Price Control, Chef and String, Chef and Icecream, The Delicious Cake, The Tom and Jerry Game!, Even Matrix
August Challenge 2020 Division 1
Insanely Hard School Exams, Subsequence Frequency Counting, Smallest KMP, Chef and Wedding Arrangements
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Ada Matrix
August Lunchtime 2020 Division 1
Elevator, Alien Invasion , Game on a Strip, Counting Graphs
June Lunchtime 2020 Division 2
Maximum AND, Chef and Demonetisation, Increasing Decreasing, Square Submatrices
September Cook-Off 2020 Division 1
Maximise Subsequence Value, Minimum Insertions
UWCOI 2021 (Rated for all)
Organisation, Array Swaps, Efficient Delivery, Hidden Numbers, Binary Puzzle
March Lunchtime 2021 Division 1
Turn It, Motivation, Make the Sum Even, Node Codon, Uniform, Lunchtime
May Lunchtime 2021 Division 1
Interactive MST, Total Components, K-Subarrays
June Lunchtime 2021 Division 1
From Rational to Binary, Node Marking, Tic Tac Toe
Japan