Optimistic Olaf

• Username: 3★raihan_khan
• Country:  Bangladesh
• Student/Professional:Student
• Institution:Comilla University, Bangladesh
• CodeChef Pro Plan: No Active Plan. View Details

Submissions Heat Map

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

Rating Graph

No. of Contests Participated: 37

Current Ratings Graph Old Ratings Graph

1608 (-41)RatingProvisional
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May Challenge 2021 Division 2 (Rated)(2021-05-17 15:00:02)

Global Rank:   5720

Cheated in:   

Ratings System Update

(2021-05-17 15:00:02)

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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1608 (+70)RatingProvisional
Rating i Provisional Rating, click to know more

May Challenge 2021 Division 2 (Rated)(2022-12-20 00:00:00)

Global Rank:   5720

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 (37)

September Challenge 2017

Little Chef and Sums

June Cook-Off 2017

Ada and crayons

International Coding League (Rated)

Matrix Game

March Challenge 2018 DIV 2

A Big Sale, Mix the Colors, Chef and Glove

April Challenge 2018 Division 2

Workers

June Challenge 2018 Division 2

Naive Chef

August Challenge 2018 Division 2

Sheokand and Number, Spell Bob

September Challenge 2018 Division 2

Magician versus Chef

November Challenge 2018 Division 2

Chef and Difficult Contests, Chef and Ridges

October Challenge 2018 Division 2

Chef and Serves, Byte to Bit

Quick Code (Rated for Division 2)

Immortal Frieza

ProCon 2018 (Rated for all)

The Great Run

Encoder (Rated for Division 2)

Knight Chess

December Lunchtime 2018 Division 2

Print Pattern

January Challenge 2019 Division 2

Fancy Quotes

February Challenge 2019 Division 2

Chef and Secret Ingredients, Deputy Chef, Appy and Contest

April Challenge 2019 Division 2

Friend or Girlfriend, Maximum Remaining, Fencing

May Challenge 2019 Division 2

Reduce to One

May Cook-Off 2019 Division 2

Chain Reaction

June Challenge 2019 Division 2

Road Signs, Chef and Proxy, Guddu on a Date

June Lunchtime 2019 Division 2

Ping Paja Pong, Magda and Silly Pairs

September Challenge 2019 Division 2

Easy Fibonacci

November Challenge 2019 Division 2

Hard Sequence, Weapon Value

December Challenge 2019 Division 2

That Is My Score!, Easy Subsequence Selection, Plus Multiply

December Lunchtime 2019 Division 2

Stupid Machine, Check Algorithm, Guess the number

January Challenge 2020 Division 2

Chef and Dynamo, Doraemon, Breaking Bricks

March Challenge 2020 Division 2

Pintu and Fruits

April Challenge 2020 Division 2

Strange Number, Sell All the Cars, COVID Pandemic and Long Queue

April Cook-Off 2020 Division 2

Matrix Decomposition, Lift Requests

June Challenge 2020 Division 2

Chef and Price Control, Chef and String, Covid Sampling (Challenge), The Tom and Jerry Game!, Even Matrix, Chef and Icecream

August Challenge 2020 Division 2

Chef Wars - Return of the Jedi, Another Card Game Problem, Chef and Linear Chess, Smallest KMP, Chef and Wedding Arrangements

November Challenge 2020 Division 2

Restore Sequence, Ada and Dishes

December Challenge 2020 Division 2

Hail XOR, Vaccine Distribution, Vaccine Production, Even Pair Sum, Positive Prefixes

December Lunchtime 2020 Division 2 (Unrated)

Three Letters, Sed Sequences, Horoscope Matrix, One Zero Swaps

UWCOI 2021 (Rated for all)

Hidden Numbers

May Challenge 2021 Division 2 (Rated)

Xor Equality

Total Problems Solved: 138