Piotr Pietrzak

• Username: 4★kreyyy
• Country:  Poland
• 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: 27

Current Ratings Graph Old Ratings Graph

1880 (+12)RatingProvisional
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January Challenge 2018(2018-01-15 15:00:00)

Global Rank:   1652

Cheated in:   

Ratings System Update

(2018-01-15 15:00:00)

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

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1880 (-12)RatingProvisional
Rating i Provisional Rating, click to know more

January Challenge 2018(2022-12-20 00:00:00)

Global Rank:   1652

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 (27)

November Challenge 2013

Uncle Johny, Square Digit Squares, Missing some chairs

December Challenge 2013

Magic Pairs

May Cook-Off 2014

Divide the Cake, Ups and Downs

July Cook-Off 2014

Copy-Paste, Sum Queries

November Cook-Off 2014

Lost Graph, Most Distant Points, Brackets, Petersen Graph

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

April Challenge 2014

Sereja and Permutation, Counting Matrices, Farmer Feb, Cards, bags and coins, Chef and Digits, Divide the Tangerine, 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

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

August Challenge 2014

Mountain Holidays 2, Chef and Reversing, The Leaking Robot, Cleaning Tables, Chef and Gift

September Challenge 2014

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

October Challenge 2014

Remy paints the fence, Sereja and two strings, Chef and Ground, Chef and Painting, Chef and Square, Magical Girl and Colored Liquid Potions, DevuLand, Dinosaurs and Laddus

December Challenge 2014

Chef Under Pressure, Alok-nath and His Sanskars, Chef and Bracket-Pairs, XOR with Subset, Chef and Apple Trees

April LunchTime 2014

Knight Fork

August Lunchtime 2014

Harrenhal

January Challenge 2015

Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries

April Challenge 2015

Chef and Interview, Broken Telephone, Chef and Piano Scales

November Challenge 2015

Chef and cakes

March Cook-Off 2015

How to Minimize a String, How to Repaint a Fence

March Challenge 2016

Chef And Hungry Birds, Palindromic substrings, Floor Distribution, maximize the sum, Parity tree

October Challenge 2016

Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs

June Challenge 2017

Chef and Prime Queries, A Good Set, Cloning, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets

December Challenge 2017

Chef and Direction, Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays

January Challenge 2018

K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers

Total Problems Solved: 111