Obaidur Rahman

• Username: 3★obaidur_rahman
• Country:  India
• Student/Professional:Student
• Institution:Indian Institute of Technology Goa India
• 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: 28

Current Ratings Graph Old Ratings Graph

1696 (-7)RatingProvisional
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February Cook-Off 2022 Division 2(2022-02-21 22:30:02)

Global Rank:   1934

Cheated in:   

Ratings System Update

(2022-02-21 22:30:02)

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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1696 (-50)RatingProvisional
Rating i Provisional Rating, click to know more

February Cook-Off 2022 Division 2(2022-12-20 00:00:00)

Global Rank:   1934

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 (28)

February Challenge 2020 Division 2

School of Geometry

March Challenge 2020 Division 2

Ada Bishop 2, Pintu and Fruits

April Challenge 2020 Division 2

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

May Challenge 2020 Division 2

Coronavirus Spread, Isolation Centers

March Cook-Off 2020 Division 2

Find Your Gift

April Cook-Off 2020 Division 2

Lift Requests

April Lunchtime 2020 Division 2

Chef in Fantasy League

May Lunchtime 2020 Division 2

Weird Walk, Lost Weekends

June Challenge 2020 Division 2

Chef and String, Chef and Price Control, The Tom and Jerry Game!, Even Matrix, Chef and Icecream

July Challenge 2020 Division 2

Ada King, Missing a Point, Chef and Card Game, Chef and Strings

August Challenge 2020 Division 2

Another Card Game Problem, Chef and Linear Chess, Chef Wars - Return of the Jedi

September Challenge 2020 Division 2

Chefina and Swap, A Problem on Sticks, Chef and Trump Cards, Find XOR, Ada Matrix, Coronavirus Spread 2

July Cook-Off 2020 Division 2

Even-tual Reduction

July Lunchtime 2020 Division 2

Chef and Steps

August Cook-Off 2020 Division 2

Polygon Relationship, Chef and Work, K-Foldable String

August Lunchtime 2020 Division 2

Game on a Strip, Mode of Frequencies

June Cook-Off 2020 Division 2

Cache Hits

June Lunchtime 2020 Division 2

Chef and Demonetisation, Increasing Decreasing

October Challenge 2020 Division 1

Positive AND, Replace for X

January Challenge 2021 Division 2

Chef and Ants, Fair Elections

December Cook-Off 2020 Division 1

Self-Destructing Strings

January Cook-Off 2021 Division 2

Maximise Islands, Prime Tuples

December Lunchtime 2020 Division 2 (Unrated)

Three Letters, Sed Sequences

January Lunchtime 2021 Division 2 (Unrated)

Binary Subsequence, Even Differences, Even Sum

October Cook-Off 2020 Division 1

Path-etic Sums

November Cook-Off 2020 Division 2

Flip the String, Chef and IPC Certificates

September Cook-Off 2020 Division 1

Maximise Subsequence Value

September Lunchtime 2020 Division 1

Root the Tree, Robot Detector

October Lunchtime 2021 Division 2

Chef and Water Car, Exactly N plus 1 Values

February Cook-Off 2022 Division 2

Perfect Permutation, Prefix Permutation

Total Problems Solved: 88