Pavel Ustinov

• Username: 5★rotozoom
• Country:  United States
• Student/Professional:Professional
• Organisation:Microsoft
• CodeChef Pro Plan: No Active Plan. View Details

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Last 6 Months 2026 (Jan-Jun)2025 (Jul-Dec)2025 (Jan-Jun)

Rating Graph

No. of Contests Participated: 22

Current Ratings Graph Old Ratings Graph

2075 (-71)RatingProvisional
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December Challenge 2018 Division 1(2018-12-18 01:00:00)

Global Rank:   679

Cheated in:   

Ratings System Update

(2018-12-18 01:00:00)

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2075 (+282)RatingProvisional
Rating i Provisional Rating, click to know more

December Challenge 2018 Division 1(2022-12-20 00:00:00)

Global Rank:   679

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)

November Cook-Off 2014

Brackets, Lost Graph, Petersen Graph

December Cook-Off 2014

Matrix Again, Good Joke!

November Challenge 2014

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

December Challenge 2014

Chef and Apple Trees, XOR with Subset, Chef and Bracket-Pairs, Chef Under Pressure

December Lunchtime 2014

Delivery Man

January Challenge 2015

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

January Lunchtime 2015

Piece of cake, Candidate walk

February Challenge 2015

Chef and Chain, Time to Study Graphs with Chef, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality

March Challenge 2015

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

April Challenge 2015

Count Sequences, Chef and Interview, Broken Telephone, Inversion sorting, Chef and Piano Scales

July Challenge 2015

Addition and Multiplication, Rohith and Circles, Chef and Cube, Na2a and lucky stone, Bread, MasterChef, Maximum Difference Walk, Sereja and Game 2

February Cook-Off 2015

Parenthesis with Maximum Sum Subarray, Fit Squares in Triangle, Strategy for the World Cup

March Cook-Off 2015

How to Minimize a String, How to Write a Message, How to Repaint a Fence

April Cook-Off 2015

Equality, Version Control System

June Cook-Off 2015

Ankit, Srijan and a game of stone piles, Longest non regular parentheses sub-sequence, Strange operations

September Mega Cook-Off 2015

Stacks, Super Numbers, Reign 2, Forgotten Language

February Lunchtime 2015

Lucky Four, Heavy-light Decompositions, The Warehouse

August Lunchtime 2015

Churu and lost string, Make Palindrome, Minimum Maximum

June Challenge 2017

Chef and the Feast, Xenny and Coin Rankings, A Good Set

November Challenge 2017

Chef Hates Palindromes

January Challenge 2018

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

December Challenge 2018 Division 1

Max and Electrical Panel

Total Problems Solved: 127