Rayhan Chowdhury

• Username: 4★mainstring2
• Country:  Bangladesh
• Student/Professional:Student
• Institution:Bangladesh University of Engineering and Technology
• 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: 19

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1868 (-57)RatingProvisional
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May Challenge 2019 Division 2(2019-05-13 15:03:00)

Global Rank:   2094

Cheated in:   

Ratings System Update

(2019-05-13 15:03:00)

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1868 (+209)RatingProvisional
Rating i Provisional Rating, click to know more

May Challenge 2019 Division 2(2022-12-20 00:00:00)

Global Rank:   2094

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 (19)

March Challenge 2015

Devu and his Class, Sign Wave, Count Substrings

December Challenge 2015

Chef and Girls, Chef and Filters, Misha and Permutation, Oracle Devu and Longest Common Subsequence, Plane Division, Chef and the stones, Chef and cinema, Sereja and Dividing

December Cook-Off 2015

Chef and Subarrays

January Long Challenge 2016

Sereja and Salesman, Chef and Inflation, Rupsa and the Game, Churu and Balls, Chef and Time Machine, Devu and Perfume

February Challenge 2016

Chef and Strange Operations, Matrix Maximum Sum, Chef-Detective, Devu and a light discussion, Sereja and Two Lines, Rectangles of Love

March Challenge 2016

Palindromic substrings, maximize the sum, Chef And Special Dishes

April Challenge 2016

Fibonacci Queries, Chef And Coloring, Chef And Magical Path, Chef and Ballons, Help Watson Escape, Amazing Experiment

July Challenge 2016

Andrash and Stipendium, Chef and Robots Competition, Chefland and Electricity

August Challenge 2016

Chef and His Garden, Chef and Round Run, Chef and Circle Run, Chef and Chocolate

September Challenge 2016

Chef and Friends, Dividing Machine, Chef and digits of a number, Faded Palindromes, The New Restaurant, JosephLand, Chef and calculation

October Challenge 2016

Chef and Keyboard, Big Queries, Fenwick Iterations, Chef and Three Dogs, Chef and Two String

November Challenge 2016

Task for Alexey, Chef and squares, Gift and Chef, Friends Meeting, Count Permutations, Urban Development

December Challenge 2016

Train Partner, Kirito in labyrinth, Our Base is Under Attack

January Challenge 2017

Capital Movement, Cats and Dogs

April Challenge 2017

Bear and Random Grid, Similar Dishes, Bear and Clique Distances, Bear and Row 01, Dish Of Life, Stable market, Chef and Divisor Tree, Chef and Digits

October Challenge 2017

Chef and Cycled Cycles

May Challenge 2019 Division 2

Ada Rooks 2

Total Problems Solved: 78