Bartosz Kostka

• Username: 5★kostka
• Country:  Canada
• Student/Professional:Student
• Institution:University of Wrocław Poland
• CodeChef Pro Plan: No Active Plan. View Details

Submissions Heat Map

Last 6 Months 2025 (Jul-Dec)2025 (Jan-Jun)2024 (Jul-Dec)2024 (Jan-Jun)

Rating Graph

No. of Contests Participated: 22

Current Ratings Graph Old Ratings Graph

2180 (+47)RatingProvisional
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August Cook-Off 2017(2017-08-21 00:00:00)

Global Rank:   38

Cheated in:   

Ratings System Update

(2017-08-21 00:00:00)

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2180 (+81)RatingProvisional
Rating i Provisional Rating, click to know more

August Cook-Off 2017(2022-12-20 00:00:00)

Global Rank:   38

Cheated in:   

Ratings System Update

(2022-12-20 00:00:00)

This is the difference due to changing the rating system.This graph is not updated after 20th Dec 2022. Know more

How the rating system works?

Learning Paths (0)

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Practice Paths (0)

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Contests (22)

January Challenge 2014

Please like me, Chef and Feedback, Bon Appetit

July Cook-Off 2014

Copy-Paste, Sum Queries, Friends

August Cook-Off 2014

Tree Game, Permutation Shuffle

December Cook-Off 2014

Matrix Again, Player, Good Joke!

April Challenge 2014

Counting Matrices, Shortest Path in Binary Trees, Divide the Tangerine, Chef and Digits, Farmer Feb, Sereja and Permutation

June Challenge 2014

Chef and Digit Jumps, Chef and Subarray, Guessing Game, Forgot Password

July Challenge 2014

Garden Game, Dish Owner, Reach The Point, Count Substrings, Chef and Frogs, Little Elephant and Painting, Chef and Rectangle Genome

August Challenge 2014

Chef and Reversing, Team Sigma and Fibonacci, The Leaking Robot, Cleaning Tables, Chef and Gift

September Challenge 2014

Chef and Left-Right, Fun with Rotation, Chef and Rainbow Array - 2

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

Let us construct palindrome, Chef and Red Black Tree, Chef and Words, Chef and Segment Game, Distinct Characters Subsequence

December Challenge 2014

Chef Under Pressure, Alok-nath and His Sanskars, Kali and Devtas, XOR with Subset, Chef and Apple Trees

July Lunchtime 2014

And Operation, Shift The String

January Challenge 2015

Sereja and Number Division 2, Gcd Queries, Ranka, One Dimensional Kingdoms, Sereja and Votes, Chef and Stones, Chef and A Large Permutation, Queries on the String

January Lunchtime 2015

Piece of cake, Candidate walk

March Challenge 2015

Matrix, Sign Wave, Chef and Notebooks, Count Substrings, Devu and his Class

May Challenge 2015

Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Cake

July Challenge 2015

Bread, Na2a and lucky stone, Chef and Cube

February Cook-Off 2015

Strategy for the World Cup, Fit Squares in Triangle, Zombinatorial

January Long Challenge 2016

Rupsa and the Game, Churu and Balls, Devu and Perfume

August Long Challenge 2017

Chef and Rainbow Array, Chef And Fibonacci Array, Chef and Mover, Palindromic Game, Greedy Candidates, Strings and Graphs

August Cook-Off 2017

Game on Stick, Matrix and Chef, Real obtuse, From heaven to earth

Total Problems Solved: 102