Ivan Lupov

April Challenge 2020 Division 2

Sell All the Cars, Strange Number, COVID Pandemic and Long Queue

April Cook-Off 2020 Division 2

Matrix Decomposition, Lift Requests

May Challenge 2021 Division 2 (Rated)

Xor Equality

September Challenge 2021 Division 3 (Rated)

XOR Equal, Shuffling Parities, Airline Restrictions, Travel Pass

October Cook-Off 2021 Division 3

01 Subsequence, Find the Modulus, Average Flex, Odd Sum, Can You Reach The End, Chef and Pairing Slippers

October Lunchtime 2021 Division 2

Median Rearrangement, Exactly N plus 1 Values

November Challenge 2021 Division 2 (Unrated)

Wildcard Replacement, Xor Equation, Weird Palindrome Making, Hill Sequence, Equal Coins, Maximise the bridges

November Cook-Off 2021 Division 1

Product Pain

CodeChef Starters 17 Division 2 (Rated)

New Piece, Find the Special Node, String Game, GCD of Prefixes, Binary Inversion, Partition It

CodeChef Starters 24 Division 2 (Rated)

Anti Palindrome, Avoid Contact, Divisors and Reciprocals, Yet Another Constructive Problem

CodeChef Starters 25 Division 2 (Rated)

Building Towers, Equal MEX, K Distinct Array, Points and Lines

February Cook-Off 2022 Division 2

PerMEXuation , Prefix Permutation, Mango Market, Perfect Permutation, Xor Becoming Uncanny

CodeChef Starters 28 Division 1 (Unrated)

Travelling in the Graph, Permutation Xority

CodeChef Starters 29 Division 1 (Unrated)

Plusle and Minun on Array, Decomposition Reaction

April Lunchtime 2022 Division 1(Rated)

Secret Machine Mania

Starters 52 Division 1 (Unrated)

Minimum Sum, K-Flip, Flipping Failure, Nil Xor

February Cook-Off 2023 Division 2 (Rated)

Take Not Less, Permutation and Modulus

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