Andrew Kostianoy

May Lunchtime 2020 Division 2

Weird Walk, Escape One, Tree difference, Convert the String, Lost Weekends

June Challenge 2020 Division 2

The Tom and Jerry Game!, Chef and Price Control, Danya and Different Values, Chef and String, Covid Sampling (Challenge), Chef and Icecream, The Delicious Cake, Operations on a Tuple, Even Matrix

July Challenge 2020 Division 1

LCM Constraints, Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef

August Challenge 2020 Division 1

Chef and Wedding Arrangements, Chef Thanos Wants Perfect Balance, Ants (Challenge) , Chefina and Strange Tree, Subsequence Frequency Counting, Insanely Hard School Exams, Smallest KMP

September Challenge 2020 Division 1

Chefina and Swap, Chef and Trump Cards, Find XOR, Move the Coins - Creating Tests, Ada Matrix

July Cook-Off 2020 Division 1

Even-tual Reduction, Path-etic Products, OR-thodox Distinction, The In-XOR-able Task, What Is This, a Crossover Episode

July Lunchtime 2020 Division 1

Profitable Paths 2, Golomb Sequence, Binary Concatenation

June Cook-Off 2020 Division 1

Per Capita Income, Checkpoints, Banned Quotient

June Lunchtime 2020 Division 1

Square Submatrices, Gold Mining, Maximum AND, Kuroni and the Cowsheds

October Challenge 2020 Division 1

Inversions, Positive AND, Rooted Minimum Spanning Tree, Replace for X, D-Dimensional MST, Compress all Subsegments, Adding Squares

November Challenge 2020 Division 1

Unusual Queries, Scalar Product Tree, Magical Candy Store, Restore Sequence

January Cook-Off 2021 Division 1

Mex Subsequence, Not Too Colourful, Prefix And, Common Ancestors

December Lunchtime 2020 Division 1 (Unrated)

Three Letters, One Zero Swaps

October Cook-Off 2020 Division 1

Path-etic Sums, Yet Another Crossover Episode

November Cook-Off 2020 Division 1

Chef and IPC Certificates, Hiring Workers, Communication Channel, Flip the String, Graph Construction

October Lunchtime 2020 Division 1

Chef Likes Good Sequences, Chef Is Just Throwing Random Words, Cute Chef Gift

September Cook-Off 2020 Division 1

Joined Subarrays on Tree, Maximise Subsequence Value, Minimum Insertions

September Lunchtime 2020 Division 1

Root the Tree

March Cook-Off 2021 Division 1

Consecutive Deletions

March Challenge 2021 Division 1

Dense Graph, Locked Safe, Space Arrays, Substring Probability

April Cook-Off 2021 Division 1

Tree Distances, OR of ANDs, Valet Parking, Deletion Sort

April Lunchtime 2021 Division 1

A Special Tree

June Challenge 2021 Division 1 (Unrated)

Maximum Frequent Subarray Sum, MathBuzz

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