Rayhan Biin Amir

• Username: 3★rayhan_iu
• Country:  Bangladesh
• Student/Professional:Student
• Institution:Islamic University, Bangladesh
• 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: 30

Current Ratings Graph Old Ratings Graph

1606 (+29)RatingProvisional
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Starters 59 Division 3 (Rated)(2022-10-05 23:00:04)

Global Rank:   486

Cheated in:   

Ratings System Update

(2022-10-05 23:00:04)

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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1606 (+10)RatingProvisional
Rating i Provisional Rating, click to know more

Starters 59 Division 3 (Rated)(2022-12-20 00:00:00)

Global Rank:   486

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 (30)

CodeChef Starters 26 Division 4 (Rated)

Stone Game, Car or Bike, Valentine is Coming, Count the Notebooks, Hostel Room, Control the Pollution

CodeChef Starters 27 Division 4 (Rated)

Distinct Binary Strings, Get Lowest Free, Too many items, Shopping Change, Blackjack, The product mystery

February Cook-Off 2022 Division 4

Complete the credits, Guess the bottom face, Lazy Salesman, Peaceful Party, Prefix Permutation

February Lunchtime 2022 Division 4

Four Equidistant Points on a Grid, Good Program, Parallel Processing, Battery Low, Watching Movies at 2x, Chessboard Distance

CodeChef Starters 29 Division 3 (Rated)

String protocol

CodeChef Starters 30 Division 4 (Rated)

Chef and Water Bottles, Swapping Chefs Way, Chef and Chocolates, Balanced Reversals

CodeChef Starters 31 Division 4 (Rated)

Alternating String, Sign Moves, Cup Finals, The Unchanging OR, Group Assignment, Economics Class

March Lunchtime 2022 Division 4

Credit score, Minimum number of coins, Buy 2 Get 1 Free, CRED Coins, Adjacency Love

April Cook-Off 2022 Division 4

Email Reminders

Starters 40 Division 4 (Unrated)

Difficulty Rating Order, Doubt Support Availability, Whatsapp Messages, Take discount or Not

July Cook-Off 2022 Division 4 (Rated)

Enough Space, Chef Drinks Tea, High Accuracy

Starters 41 Division 4 (Rated)

Equal Integers, Chef and Brain Speed, Chef and Chocolates, Is this priority or parity!, Path Parity

June Cook-Off 2022 Division 4 (Rated)

Simple XOR, Rating Improvement, Playlist, Break the Stick, First and Last

Starters 42 Division 4 (Rated)

Divisible by 3, Age Limit, Equal Distribution, Minimum number of Flips

June Long One 2022 Division 4 (Rated)

Reduce to zero, Chairs Requirement, Subscriptions, Divisible by i , Possible GCD, Alternate Additions, Equal Strings

Starters 44 Division 4 (Rated)

Biryani classes, Air Hockey, Jogging

June Lunchtime 2022 Division 4 (Rated)

Determine the Score

June Long Two 2022 Division 4 (Rated)

Count the ACs, Make all equal using Pairs, Complementary Strand in a DNA, Reversal Sorting, Fitness

Starters 45 Division 4 (Rated)

Even Equal Odd, Chef and his Apps, Best of Two, Retrieve the Array, Adjacent Sum Parity, Change Row and Column Both

July Lunchtime 2022 Division 4 (Rated)

Interior Design, The Last Levels, Easy Pronunciation, Yet Another Palindrome Making Problem, True and False Paper

Starters 48 Division 4 (Rated)

Buy Lamps, Fill The Grid, Passes for Fair, Fill Candies, Make Palindrome 2, Positive array

Starters 49 Division 3 (Rated)

N Buttons 1 Bulb, High Frequency, Valid Minimum

Starters 50 Division 3 (Rated)

Permutation GCD, Nearest Court, Average Permutation

Starters 52 Division 3 (Rated)

Minimum Sum, WA Test Cases, Air Conditioner Temperature

August Lunchtime 2022 Division 3 (Rated)

Test Averages, Candy Distribution, Equalizing Numbers, Easy Permutation, Array Equality, Height of Rationals

Starters 53 Division 3 (Rated)

Car Trip, Greater Average, Odd Pairs, Make A and B equal, Weights

Starters 54 Division 3 (Rated)

Equal Distinct, Ticket Fine, Team of Two

September Long 2022 Division 3 (Rated)

Speed Limit Test, Bob at the Bank, Good Pairs

September Lunchtime 2022 Division 3 (Rated) (Based on EJOI)

Flip the cards, Equalize AB, Stick Break, Permutation Creation

Starters 57 Division 3 (Rated)

Maximum Expression, Even Splits, Non-Negative Product, Two Different Palindromes

Starters 59 Division 3 (Rated)

Chef and Happy String , Maximum Subarray , Suspense String, Confusing Concatenations, Audible Range, Speciality

Total Problems Solved: 155