Vitaly Demidenko

June Cook-off

Correctness of Knight Move, Super-plane

August Cook-off 2011

Open the Dragon Scroll, Rotate the String

November Cook-Off

Moving Coins, Subanagrams

December 2011 Long Contest

Robot Movings

December Cook-Off

Ciel and New Menu, Ciel and A-B Problem

January 2012 Challenge

Houses and Restaurants, Lucky Sum, Card Shuffle

February 2012 Challenge

Lucky Count, Lucky Long, Word Couting, Count of Maximum

February 2012 Cook-off

Daily Train, Equation Solver

March 2012 Challenge

Longest Weird Subsequence, Free Shuttle Service, Home Delivery, Spoon in Matrix

July Challenge 2012

Chef's Dream, My Fair Coins, Gift Rift, Restaurant Rating

September Challenge 2012

Lights, Racing Horses, Queries About Numbers, ChefTown Parade

February 2013 Challenge

Buy1-Get1, Vacation, Observing the Tree, Word Play

March Challenge 2013

Random decreasing function, Tourist Translations, Approximately, Fire Escape Routes

December Challenge 2013

Lucy and the Flowers, Cube Cakes, Chef and Codes, Funny Marbles, Magic Pairs, Reign, Rectangular Queries

January Challenge 2014

Magic Trick, Chef and Feedback

July Cook-Off 2014

Copy-Paste, Sum Queries, Friends

February Challenge 2014

Little Elephant and Movies

March Challenge 2014

Sereja and Sorting 2, Team Split, Binary Tournament, Walk, Maximum number, GCD condition, Little Chef and Numbers, Mike and Stamps, A Story with Strings, Chef and Graph Queries

April Challenge 2014

Counting Matrices, Cards, bags and coins

July Challenge 2014

Little Elephant and Painting, Garden Game, Chef and Frogs, Sereja and Equality, Chef and Rectangle Genome, Count Substrings, Reach The Point, Dish Owner, Lucky Game, Game of Numbers

August Challenge 2014

Mountain Holidays 2, Little Elephant and T-Shirts, Chef and Reversing, The Leaking Robot, Push the Flow!, Earthquake, Cleaning Tables, Chef and Gift

December Challenge 2014

Chef Under Pressure, Chef and Bracket-Pairs, XOR with Subset, Sereja and GCD

June Lunchtime 2014

Substring Query, Coprime Triples, The Smallest Pair, Dynamic Inversion

January Challenge 2015

Queries on the String, Sereja and Number Division 2, Sereja and LCM, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Xor Queries, Gcd Queries

February Challenge 2015

Chef and Strange Formula, Devu and Locks

March Challenge 2015

Count Substrings, Chef and Notebooks, Chef and Problems, Sereja and Random Array, Devu and his Class, Sign Wave, Matrix, Counting on a Tree

April Challenge 2015

Chef and Array, Inversion sorting

June Challenge 2015

Steady tables, Another Fibonacci, Chef and String

October Challenge 2015

Count Subarrays

November Challenge 2015

Simple Sum

April Challenge 2016

Help Watson Escape, Fibonacci Queries, Chef And Coloring

May Challenge 2016

Sereja and GCD 2, Easy Queries, Chef and math, Chef and Amazingness of Numbers

June Challenge 2016

Chef and Rectangle Array

July Challenge 2016

Chef and Segments

September Challenge 2016

Dividing Machine

November Challenge 2017

Chef and Subarray Queries

January Challenge 2018

K-Concatenation, Maximum Score, Rectangle

May Challenge 2020 Division 2

Buying a New String, Triple Sort, Sorting Vases, Coronavirus Spread, Chef and Bitwise Product, Isolation Centers

June Challenge 2020 Division 2

Chef and String

August Challenge 2020 Division 2

Insanely Hard School Exams, Subsequence Frequency Counting, Chefina and Strange Tree, Chef Wars - Return of the Jedi, Another Card Game Problem, Chef and Linear Chess, Smallest KMP, Chef and Wedding Arrangements

September Challenge 2020 Division 2

Chefina and Swap, Move the Coins 2, A Problem on Sticks, Chef and Trump Cards, Find XOR, Rotate the Polyline, Divide Candies, Vibrating Paths (Challenge), Ada Matrix, Coronavirus Spread 2

October Challenge 2020 Division 1

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

November Challenge 2020 Division 1

Panic! at the Disco, Chef and the Combination Lock, Connect on a Grid (Challenge), Restore Sequence, Magical Candy Store, Scalar Product Tree, Unusual Queries

January Challenge 2021 Division 1

Chef and Ants, Guess the Tiling, Expected Number of SCCs, Blackjack, Stack-Queue Sort (Challenge), Sequence Creation, And-Or Game

December Challenge 2020 Division 1

Hail XOR, Square Root of LCA Convolution, Calculus, Permutations, String Operations, Positive Prefixes, Even Pair Sum

February Challenge 2021 Division 1

Another Tree with Number Theory, XOR Sums

April Lunchtime 2021 Division 1

A Special Tree

May Lunchtime 2021 Division 1

Tokens On A Tree, Total Components, K-Subarrays

May Challenge 2021 Division 1 (Unrated)

Valid Paths, An Interesting Sequence

June Challenge 2021 Division 1 (Unrated)

Minimum Dual Area, Bitwise Tuples, Bella ciao, Dual Distance, Maximum Frequent Subarray Sum, Summer Heat, Optimal Xor Set, Minimum Subtree Cover

June Lunchtime 2021 Division 1

From Rational to Binary, False Number, Node Marking, Tic Tac Toe

July Challenge 2021 Division 1 (Unrated)

XxOoRr, Chef vs Bharat, Chef and Pairs, K Path Query

August Challenge 2021 Division 1 (Unrated)

Special Triplets, Problem Difficulties, Olympics Ranking

December Lunchtime 2021 Division 1

In-tree-active Node Coloring, Optimal Sorting, Romantic Reversals, Sleep Technique , Point constraints

January Long 2022 - I, Division 1 (Unrated)

Sequence Master, Retrieve back the Array

January Lunchtime 2022 Division 1

Permutation XOR Sum, Divisible Distances

February Lunchtime 2022 Division 1

Chef Cooks Permutation, Visit Them All, Magnet Sort

March Cook-Off 2022 Division 1

Secret Tree, Dragonado And XOR, Alternating Divisibility

March Lunchtime 2022 Division 1

Mathology, Winter, Adjacency Love, Separate Them All

May Lunchtime 2022 Division 1 (Rated)

Equal After And

June Lunchtime 2022 Division 1 (Rated)

The Lost Array, Max Shift After XOR, XOR Times 2 Is Sum

February Cook-Off 2023 Division 1 (Rated)

Take Not Less, Alice Potter and OWL, Alice Potter And Dumbledore Army

Problems Authored (2)

Problems Tested (0)

No Contribution

Editorials Contributed (0)

No Contribution