May Challenge 2018 Division 2
Change the Signs, Mighty Friend, Dibs on Fibs, Fake Binary Search, Minimum Deletions, Xor Again
June Challenge 2018 Division 2
Vision, Sheokand and String, Binary Shuffle, Naive Chef
December Challenge 2018 Division 1
(Challenge) Delete DAG, Colorblind Feast, Max and Electrical Panel, Directing Edges, Chef and Interactive XOR
January Challenge 2019 Division 1
Different Neighbours, A Pizza Slice, Distinct Pairs, Yet Another Problem About Sequences
August Challenge 2019 Division 1
Guddu and his Mother, Encoding, Dilemma, Maximize an Expression, Chef and Gordon Ramsay, Complement Spanning Trees
November Lunchtime 2019 Division 1
Perfection, Planting Trees, Team Trees, Washing Windows
February Challenge 2020 Division 1
Chef and Railway Stations, Expected Change, No Change Required
August Challenge 2020 Division 1
Subsequence Frequency Counting, Smallest KMP, Chef and Wedding Arrangements
December Challenge 2020 Division 1
Hail XOR, Square Root of LCA Convolution, String Operations, Positive Prefixes, Even Pair Sum
December Cook-Off 2020 Division 1
Self-Destructing Strings, Carry All Fruits, Circle of Chaos, Sed Passwords
December Lunchtime 2020 Division 1 (Unrated)
K-Tuple Tree, Even Sequence, Three Letters, One Zero Swaps
UWCOI 2021 (Rated for all)
Organisation, Array Swaps, Efficient Delivery, Hidden Numbers, Binary Puzzle
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