Oleksandr Kozlov
Bronze League
- kai977
Ukraine- Professional
- Taurida V.I. Vernadsky National University
- No Active Plan. View Details
Submissions Heat Map
Learning Paths (6)
Machine Learning
Build with Django: Web Development for Beginners
Build with Flask: Web Development for Beginners
Learn React JS for Front-end development
Learn HTML / CSS
Learn JavaScript
Practice Paths (2)
Contests (157)
July 2009 (Contest V)
Lights Off, The White Knight, Johny the farmer, Sums in a cuboid
August Cook-off 2011
Open the Dragon Scroll
October Long Contest 2011
Dish Distribution
April Challenge 2012
Fit to Play, Double Strings, Stacking Pancakes
May Challenge 2012
Jewels and Stones, Lucky lucky number, Divisible Pairs, Remember the recipe, A Home for Chef
June Challenge 2012
Little Elephant and Candies, Doom Bakes Cakes, Arranging Cup-cakes
July Challenge 2012
Chef's Dream, My Fair Coins, The Gray-Similar Code, Gift Rift, Restaurant Rating
August Challenge 2012
Little Elephant and Bombs, Lucky Driving, Range of Data, Delivery Boy
September Challenge 2012
Kisses & Hugs, Chef World, Racing Horses, Queries About Numbers, ChefTown Parade, Three is Crowd
October Challenge 2012
Fierce Battles, The New Scheme
September Cook-Off 2012
Recipe Reconstruction, Carvans
November Challenge 2012
A Wonderful Chocolate, Delicious Dishes, Coin Flip, Sridhar Likes Travelling
December Challenge 2012
Granama Recipes, Book Exercises, Magic Rankings, The Uncountable Ways, Pizza Delivery
January Challenge 2013
Little Elephant and Alcohol, The Minimum Number Of Moves, End Of The World, Chef of the Year, Three Different Numbers
February 2013 Challenge
Little Elephant and Cards, Buy1-Get1, Climbing Stairs
March Challenge 2013
Random decreasing function, Tourist Translations, Approximately, Fire Escape Routes, Minesweeper
April Challenge 2013
Little Elephant and Music, Barcelona Gameplay Tactics, Kingdom Unity, Maximum Weight Difference, Levy Conjecture
April Cook-Off 2013
Andrew and the Meatballs
May Challenge 2013
Matchsticks, Witua and Math, Name Reduction, Your Name is Mine
June Challenge 2013
Dessert Wizard, Lapindromes
May Cook-off 2013
Subtraction Game 1, Subtraction Game 2
July Challenge 2013
Chef and Walking on the rectangle , Count K-Primes, Circle of death
August Challenge 2013
Little Elephant and Lemonade, Hello Hello, Save The Princess, The Number Of Solutions, Chef and Segments, Splitting Candies
September Challenge 2013
Little Elephant and Exams, Cool Guys, Chef and Integers , CAO Stage-1, CAO Stage-2
September Cook-Off 2013
Strange Matrix, Code
October Cook-Off 2013
Polo the Penguin and the Numbers, Polo the Penguin and the Test
October Challenge 2013
Helping Lira, Maxim and Dividers
November Challenge 2013
Superpowers of 2, Uncle Johny, Square Digit Squares, Missing some chairs
November Cook-off 2013
Am I a Fibonacci Number, Rank of the Number
December Challenge 2013
Cube Cakes, Chef and Codes, Funny Marbles, Magic Pairs, Reign, Rectangular Queries
January Challenge 2014
Magic Trick, Bon Appetit, Please like me, Chef and Feedback
February Cook-Off 2014
Chef and Remissness, Chef and Kingship
April Cook-Off 2014
Snape and Ladder
May Cook-Off 2014
Divide the Cake, Ups and Downs
July Cook-Off 2014
Copy-Paste, Sum Queries
December Cook-Off 2014
Matrix Again, Good Joke!
February Challenge 2014
Draughts, Make Him Happy, Longest Common Pattern, Little Elephant and Subarrays, Colored Array, Make It Zero 2
March Challenge 2014
Team Split, Binary Tournament, Walk, Little Chef and Numbers, Mike and Stamps
April Challenge 2014
Counting Matrices, Farmer Feb, Chef and Digits, Shortest Path in Binary Trees
May Challenge 2014
Compilers and Parsers, Chef-jumping, Chef and Strange Matrix, Stone
June Challenge 2014
Maxim and Progressions, Chef and Functions, Chef and Digit Jumps, Chef and Subarray, Guessing Game, Forgot Password
July Challenge 2014
Garden Game, Chef and Frogs, Count Substrings, Reach The Point, Dish Owner
August Challenge 2014
Chef and Reversing, The Leaking Robot, Chef and Gift
September Challenge 2014
Chef and Rainbow Array - 2, Chef and Left-Right, Chef and sequence, Fun with Rotation, Flooring
October Challenge 2014
Remy paints the fence, Chef and Ground, Chef and Painting, Chef and Square, Magical Girl and Colored Liquid Potions, DevuLand, Dinosaurs and Laddus
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Let us construct palindrome
December Challenge 2014
Alok-nath and His Sanskars, XOR with Subset, Chef and Apple Trees
June Lunchtime 2014
The Smallest Pair
July Lunchtime 2014
And Operation, Shift The String
January Challenge 2015
Queries on the String, Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Chef and Chain, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality
March Challenge 2015
Count Substrings, Chef and Notebooks
April Challenge 2015
Count Sequences, Chef and Array, Chef and Interview, Broken Telephone, Inversion sorting, Chef and Piano Scales
May Challenge 2015
Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Cake
June Challenge 2015
Steady tables, Chef and His Friend, Chef and Memory Limit, Chef and Polygons, Chef and String
July Challenge 2015
Bread, MasterChef, Na2a and lucky stone, Chef and Cube
August Challenge 2015
Way Out, Gravity Guy, Cooking Machine, Aditi and Magic Trick
September Challenge 2015
Chain of Doughnuts, Nikitosh and xor, Count Steps in Matrix, Bank robbery, Lighthouses
October Challenge 2015
Time measure, Count Subarrays, Who dares to be a millionaire, Spheres, Rupsa and Equilateral Triangle
November Challenge 2015
Chef and cakes
December Challenge 2015
Chef and the stones, Oracle Devu and Longest Common Subsequence
February Cook-Off 2015
Fit Squares in Triangle
March Cook-Off 2015
How to Minimize a String
April Cook-Off 2015
Equality, Version Control System
June Cook-Off 2015
Strange operations
July Cook-Off 2015
Cops and the Thief Devu, Maximize Disjoint Pair Sum
August Cook-Off 2015
Chef and the XORed Number , Chef and the Wildcard Matching
September Mega Cook-Off 2015
Forgotten Language, Stacks
January Long Challenge 2016
Rupsa and the Game
February Challenge 2016
Chef and Strange Operations, Chef-Detective
March Challenge 2016
Palindromic substrings, maximize the sum
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
May Challenge 2016
Chef and Balls, Forest Gathering, Chef and Big Soccer, Laddu
July Challenge 2016
Andrash and Stipendium, Chefland and Electricity
August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
April Cook-Off 2016
Movie Weekend, Odd Divisors
January Challenge 2017
Capital Movement, Cats and Dogs, Reservior
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues, Gerrymander
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
April Challenge 2017
Dish Of Life, Bear and Row 01, Similar Dishes
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator , IPC Trainers
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Greedy Candidates
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Villages and Tribes
December Challenge 2017
Chef And his Cake
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
Chef And His Characters, Chef And The Patents, Permutation and Palindrome
September Mega Cook-Off 2018 Division 1
Make a Permutation
November Cook-Off 2018 Division 1
Beautiful Garland
April Challenge 2018 Division 2
Chef and Array (Challenge), Weight of Numbers, Highway Crossing, Count Good Prefixes, Average of Pairs, Workers
May Challenge 2018 Division 1
Fake Binary Search, Dibs on Fibs
June Challenge 2018 Division 1
Two Flowers, Vision, Ways to Work
July Challenge 2018 Division 1
Reach Equilibrium, No Minimum No Maximum, Gears
August Challenge 2018 Division 1
Coordinate Compression , Modular GCD, Interactive Matrix, Lonely Cycles
September Challenge 2018 Division 1
Table Game, Bad Shuffle
December Challenge 2018 Division 1
(Challenge) Delete DAG, Max and Electrical Panel, Directing Edges, Chef and Interactive XOR
November Challenge 2018 Division 1
Appy Loves One
October Challenge 2018 Division 1
Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard
January Challenge 2019 Division 1
Yet Another Problem About Sequences, Different Neighbours, Partition the Graph, Distinct Pairs, A Pizza Slice
February Challenge 2019 Division 1
Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, Art of Balance
February Lunchtime 2019 Division 1
The Tricky Deal
March Challenge 2019 Division 1
Cheating on Queue, Yet Again a Subarray Problem
March Cook-Off 2019 Division 1
XOR N-bonacci Sequence, Markers and Caps
March Lunchtime 2019 Division 1
Corrupted Seven-Segment Display
April Challenge 2019 Division 1
Offer for Chef, Kira Loves Palindromes, Playing with Numbers, Subtree Removal
April Cook-Off 2019 Division 1
Random Game, Pied Piper vs Hooli
May Challenge 2019 Division 1
Ada Rooks 2, Where to Build the Roads
June Challenge 2019 Division 1
Lent Money, Chef and Ingredients, Intersecting Paths, Sum and GCD
July Challenge 2019 Division 1
Guess the Prime!, Codechef War, Circular Merging
August Challenge 2019 Division 1
Guddu and his Mother, Encoding, Dilemma, Maximize an Expression
August Cook-Off 2019 Division 1
Two Circles
September Challenge 2019 Division 1
Biladerim Icin, Fuzzy Linear Combinations, Chef Designed a Network
September Lunchtime 2019 Division 1
Find the Sum
October Challenge 2019 Division 1
Even Edges, Chef and Maximum Star Value, Array Modification
December Challenge 2019 Division 1
Chefina and Ranges, Binary XOR, Sticky Notes, (Challenge) Cubical Virus, Addition
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Chefina and Prefix Suffix Sums, English
February Challenge 2020 Division 1
Chef and Railway Stations, Expected Change, No Change Required, (Challenge) Raisins, Long Contest and Cook Off Overlaps
March Challenge 2020 Division 1
Lasers Everywhere
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Ready Bitwise, Leaked Answers (Challenge)
February Cook-Off 2020 Division 1
XOR Game
March Cook-Off 2020 Division 1
Mysterious Sequence
May Cook-Off 2020 Division 2
Chef and Recipe, Impressing Chefina, Chef, Chefina and Their Friendship
January Lunchtime 2020 Division 1
Construct Array, Under the Tunnels
June Challenge 2020 Division 1
The Tom and Jerry Game!, Operations on a Tuple
July Challenge 2020 Division 1
Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef
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, Divide Candies, Ada Matrix
October Challenge 2020 Division 1
Positive AND, Replace for X
January Challenge 2021 Division 2
Chef and Ants, Watching CPL, Fair Elections
December Challenge 2020 Division 1
Hail XOR, Calculus, String Operations, Positive Prefixes, Even Pair Sum
November Cook-Off 2020 Division 1
Flip the String, Chef and IPC Certificates
February Challenge 2021 Division 2
Frog Sort, Team Name, Prime Game, Multiple Games, Maximise Function
February CodeChef Starters 2021 Division 2 (Unrated)
Maximum Value, College Life 2, College Admissions, Valid String, Chef and Coupon
March Challenge 2021 Division 2
Interesting XOR!, College Life 4, Consecutive Adding, Paparazzi Gennady, Space Arrays
April Challenge 2021 Division 2
Binary String MEX, Worthy Matrix, Chef and Dice
April Cook-Off 2021 Division 2
OR of ANDs, Chocolate Monger
April CodeChef Starters 2021 Division 2 (Unrated)
Maximum Size, Thief and Police, Chef On Island, Hiring Test
May Challenge 2021 Division 2 (Rated)
Valid Paths, Tree House, An Interesting Sequence, King Killing, Xor Equality, Tic Tac Toe, Modular Equation
June Challenge 2021 Division 2 (Unrated)
Minimum Dual Area, Shortest Route, Bitwise Tuples, Bella ciao, Summer Heat, Minimum Subtree Cover
June CodeChef Starters 2021 Division 2 (Unrated)
Total Correct Submissions, Sleep Cycle, Chess Match, Cyclic Quadrilateral
July Challenge 2021 Division 2 (Unrated)
XxOoRr, Chef vs Bharat, Optimal Denomination, K Path Query
August Challenge 2021 Division 2 (Unrated)
Special Triplets, Array Filling, Geometry 1, Chef and Bulb Invention, Charge Scheduling, Problem Difficulties, Olympics Ranking
September Challenge 2021 Division 2 (Unrated)
XOR Equal, Shuffling Parities, Minimize Digit Sum, 2-D Point Meeting, Airline Restrictions, Travel Pass, Minimum Digit Sum 2
September Cook-Off 2021 Division 2
Zebra Crossing, Adjacency Hatred
CodeChef Starters 13 Division 2 (Rated)
Add and Divide, Chef in Vaccination Queue, Maximum Light Up, Make that Array!, Magical Doors
October Challenge 2021 Division 2 (Unrated)
Longest AND Subarray, Digit Removal, MEX-OR
October Cook-Off 2021 Division 2
Can You Reach The End, Odd Sum, 01 Subsequence
November Challenge 2021 Division 2 (Unrated)
Weird Palindrome Making, Hill Sequence, Equal Coins, Maximise the bridges
November Cook-Off 2021 Division 2
Product Pain, Missing Sums, Make it Divisible
December Challenge 2021 Division 2 (Unrated)
Valleys and Hills, Rock Paper Scissors, Pyramid Traversal, List of Lists, Squares Counting
December Lunchtime 2021 Division 2
Maximum Trio, Romantic Reversals
CodeChef Starters 21 Division 2 (Rated)
Akash and Grid, ChefWM, And Or Union
January Long 2022 - I, Division 2 (Unrated)
Prime in a binary string, Retrieve back the Array, Chef and Riffles
January Long 2022 - II, Division 2 (Unrated)
Crying Colours
January Lunchtime 2022 Division 2
Subarray permutations, Prefix Zeros, Permutation XOR Sum
February Long 2022 - I, Division 2 (Unrated)
Binary Base Basics, Bitwise Blend, N Queens Puzzle Solved !
February Long 2022 - II, Division 2 (Unrated)
Avoid Fixed Points, Bitwise swaps, Xor Palindrome
February Lunchtime 2022 Division 2
Four Equidistant Points on a Grid, Parallel Processing, Magnet Sort
March Long One 2022, Division 2 (Unrated)
Akash and Function, Subarray XOR, Substring of a Substring, Exact Marks
March Cook-Off 2022 Division 2
Fixed Weight, Janmansh at Fruit Market, Dragonado And XOR, Equal Mex Splitting, Alternating Divisibility
March Lunchtime 2022 Division 2
Sad Splits, Winter, Adjacency Love
April Long One 2022 Division 1 (Unrated)
Dazzling AXNODR Challenge , Pairwise Xors
April Long Two 2022 Division 1 (Unrated)
Geometric Mean Inequality
May Long One 2022 Division 1 (Unrated)
Football Cup
July Cook-Off 2022 Division 1 (Rated)
Segmentation Fault
Starters 56 Division 2 (Rated)
K-Subarrays, Binary Substitution, Maximize Colours
August Long 2023 Division 2 (Unrated)
Codechef Copy, All New CodeChef, Maximum Deliciousness, I Can Use Both Hands!
Starters 145 Division 2 (Rated)
Make My Array Equal