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Abu Rayhan Siddike
- 3★rayhan28
Bangladesh
- Other
- No Active Plan. View Details
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Ratings System Update
(2024-08-28 22:00:02)Ratings System Update
(2022-12-20 00:00:00)Learning Paths (0)
Practice Paths (1)
Contests (116)
October Challenge 2020 Division 2
Positive AND, Covid Run
December Challenge 2020 Division 2
Even Pair Sum, Vaccine Production, Vaccine Distribution
December Cook-Off 2020 Division 2
Minimum Attendance Requirement
January Challenge 2021 Division 3
Fair Elections, Chef and Division 3, Point Of Impact, Encoded String
January Lunchtime 2021 Division 3 (Unrated)
Pair Me
February Challenge 2021 Division 3
Frog Sort, Chef and Meetings, Maximise Function, Highest Divisor
March Cook-Off 2021 Division 3
Pawri Meme, Weight Balance
February Lunchtime 2021 Division 3
Daanish and Problems, Smallest Possible Whole Number
CodeChef Div 3 Rated Contest 2021 Division 3
Body Mass Index, Total Score
March CodeChef Starters 2021 Division 3 (Rated)
Nobel Prize, Possible Victory
April Challenge 2021 Division 3
Chef and Dice, Valid Pair, World Record, Strong Language
June Challenge 2021 Division 3 (Rated)
Bitwise Tuples, Bella ciao, Summer Heat
July Challenge 2021 Division 3 (Rated)
XxOoRr, Maximum Production, Relativity
August Challenge 2021 Division 3 (Rated)
Problem Difficulties, Olympics Ranking
September Challenge 2021 Division 3 (Rated)
XOR Equal, Shuffling Parities, Airline Restrictions, Travel Pass
October Lunchtime 2021 Division 3
Alternating Work Days, Exactly N plus 1 Values, Problem Category
November Challenge 2021 Division 3 (Rated)
Weird Palindrome Making, Hill Sequence, Equal Coins, Which Fuel is Cheaper
CodeChef Starters 17 Division 2 (Rated)
GCD of Prefixes, New Piece
December Cook-Off 2021 Division 2
Median Minimization
December Lunchtime 2021 Division 3
Chef and Vacation Transportation , Chef Loves 1010, Maximum Trio, Romantic Reversals
CodeChef Starters 22 Division 3 (Rated)
An Interesting Sequence, Even Subset Xor, Equal Card Game, Elections in Chefland
Infinity 2k21 Division 3 (Rated)
The Squid Game, Red Light, Green Light
January Long 2022 - I, Division 2 (Unrated)
Prime in a binary string
Exun 2021-22 Division 2 (Rated)
Sarthak and his Magic Grid, Vedant and his Hidden Array
CodeChef Starters 24 Division 2 (Rated)
Anti Palindrome, Avoid Contact, Yet Another Constructive Problem
February Long 2022 - I, Division 2 (Unrated)
Binary Base Basics, Bitwise Blend, N Queens Puzzle Solved !
February Long 2022 - II, Division 2 (Unrated)
Avoid Fixed Points, Xor Palindrome
CodeChef Starters 26 Division 2 (Unrated)
Careless Chef, Control the Pollution
February Lunchtime 2022 Division 2
Parallel Processing
CodeChef Starters 28 Division 3 (Rated)
Permutation Xority, Self Defence Training, Car Choice, Count the Holidays
March Long One 2022, Division 2 (Unrated)
Akash and Function, Exact Marks
CodeChef Starters 29 Division 3 (Rated)
String protocol, Plusle and Minun on Array, Decomposition Reaction, Bomb the base
March Long Two 2022, Division 3 (Rated)
Chef and Races, Missing Numbers, The Rating Dilemma
CodeChef Starters 30 Division 2 (Rated)
Gift Shop and Coupon, Balanced Reversals
March Cook-Off 2022 Division 3
Fixed Weight, Janmansh and Games, Janmansh at Fruit Market, Equal Mex Splitting
March Lunchtime 2022 Division 3
Sad Splits, Minimum number of coins, Buy 2 Get 1 Free
CodeChef Starters 32 Division 3 (Rated)
Maximize the Minimum, Binary String Cost, Finding Shoes, Flip Sorting
April Cook-Off 2022 Division 2
Sticks and Rectangles
CodeChef Starters 33 Division 2 (Rated)
Non Adjacent Flips, Make Them Equal
April Long One 2022, Division 3 (Rated)
Dazzling GCD Pair, Prime Sum, Dazzling AXNODR Challenge , The Cooler Dilemma 2
CodeChef Starters 34 Division 3 (Rated)
Average Array, Is the Score Consistent, Good Quality Bulbs, Positive Products
April Lunchtime 2022 Division 3(Rated)
Mario and Bullet, Pair Pain, Palindrome Pain
Starters 36 Division 3 (Rated)
Buying Sweets, Presents for Cheffina, Chef and Bird farm
May Cook-Off 2022 Division 2 (Rated)
Doubled Distances
May Long One 2022 Division 2 (Unrated)
The Attack of Queen
Starters 38 Division 2 (Rated)
Circular Track
May Lunchtime 2022 Division 3 (Rated)
Bucket and Water Flow , Problems in your to-do list
Starters 39 Division 3 (Rated)
Compress the Video, Closest Vowels, Recent contest problems, A or B
May Long Two 2022 Division 3 (Rated)
Score High, Make them Zero, Degree of Polynomial
Starters 40 Division 3 (Unrated)
Difficulty Rating Order, Infinity Staircase, Good Pairs, Take discount or Not
July Cook-Off 2022 Division 3 (Rated)
K-MEX, Xor Permutation, High Accuracy
Starters 41 Division 3 (Rated)
Equal Integers, Is this priority or parity!, Path Parity, Determine the Winner
June Cook-Off 2022 Division 3 (Rated)
Simple XOR, Break the Stick, First and Last
Starters 42 Division 2 (Rated)
Minimum or Maximum, Divisible by 3
Starters 44 Division 2 (Rated)
Dense Bracket Sequence
Starters 43 Division 3 (Rated)
The Optimal Pairs, DNA Storage, Distinct Palindrome, Joining Date
June Lunchtime 2022 Division 2 (Rated)
Zero Ones Equal One Zeros, Equal by XORing
Starters 45 Division 3 (Rated)
Even Equal Odd, Chef and his Apps, Retrieve the Array, Adjacent Sum Parity, Change Row and Column Both
Starters 46 Division 3 (Rated)
Sort the String, MATH1 Enrolment, Group Assignment, Army Training
Starters 47 Division 3 (Rated)
Similar Heights, Construct N, End Sorted, Minimum Coins
Starters 48 Division 3 (Rated)
Buy Lamps, Fill The Grid, Make Palindrome 2
July Long Two 2022 Division 3 (Rated)
Maximize Difference, Concat Sort, Chef in his Office, To Divide or Not To Divide, Sum of Product 1, Hungry Chef
Starters 49 Division 3 (Rated)
N Buttons 1 Bulb, Split The String, High Frequency, Valid Minimum
Starters 50 Division 3 (Rated)
Permutation GCD, Nearest Court, Average Permutation
Starters 51 Division 3 (Rated)
Split N, Different Medians, TV Discount, Dominant Element
August Long 2022 Division 3 (Rated)
Sale Season, Hello Equation, Two Trains, Make A and B equal
Starters 52 Division 3 (Rated)
Minimum Sum, WA Test Cases, Air Conditioner Temperature
August Lunchtime 2022 Division 3 (Rated)
Candy Distribution, Equalizing Numbers, Easy Permutation, Array Equality
Starters 53 Division 2 (Rated)
Make A and B equal
Starters 54 Division 2 (Unrated)
Equal Distinct
Starters 55 Division 2 (Rated)
Balls and Boxes, Mean and Median
September Long 2022 Division 3 (Rated)
Speed Limit Test, Bob at the Bank, Pokemon Battles, Interesting Subarray, Good Pairs
Starters 56 Division 2 (Rated)
K-Subarrays, Maximize Colours
Starters 64 Division 2 (Rated)
Luigi and Uniformity, Range Assign, Number of Distinct Elements Minimize, Distinct Neighbours
Starters 65 Division 2 (Rated)
Nahaane Jaa, Candies, Binod
Starters 66 Division 2 (Rated)
Good Binary Strings, Palindrome by Splitting, Just Like Mob!
Starters 67 Division 2 (Rated)
Maximum Angriness, Expensive Steps , Counting Problem
Starters 69 Division 2 (Rated)
Akash and Dinner, Distinct Sequence
Starters 70 Division 2 (Rated)
Minimum distance between 1s, Prime Reversal, Frequency Array Retrieval
Starters 72 Division 2 (Rated)
N Triplets
Starters 74 Division 2 (Rated)
Lcm hates Gcd, Odd Even Binary String
Starters 75 Division 2 (Rated)
Prefix Ones
Starters 77 Division 2 (Rated)
Concat Palindrome, Three Numbers
Starters 78 Division 2 (Rated)
Bitwise Equation, Valid Expression
Starters 79 Division 2 (Rated)
One Stone or Two Stones, Add smallest prime factor, Distinct Opposite Sums
Starters 81 Division 2 (Unrated)
Distinct Matrix, Divide Pages
Starters 86 Division 2 (Rated)
String Game , Maximise Score
Starters 87 Division 2 (Rated)
Existence, AB plus C
Starters 88 Division 2 (Rated)
Maximum And Or, Unstable Subarray
Starters 89 Division 2 (Rated)
Plus 2 or Minus 1, Positive or Negative Subarrays
Starters 91 Division 2 (Rated)
Odd GCD Permutation, Chef Odd, Blobby Volley Scores
Starters 94 Division 2 (Rated)
CodeChef Streak, Possible or Not, The Vowel Matrix
Starters 96 Division 2 (Rated)
Swap the numbers, Remove Multiples
Starters 97 Division 2 (Rated)
Schrodinger Smiley, Triplets Min
Starters 98 Division 2 (Rated)
Airport Management, Ball Distribution
Starters 99 Division 2 (Rated)
Card Swipe, Exclusion-Inclusion
Starters 100 Division 2 (Rated)
Stamps 100
Starters 101 Division 2 (Rated)
Warrior Chef, Lockpicking Chef
Starters 102 Division 2 (Rated)
Bit Play
Starters 103 Division 2 (Rated)
Divisible By 8, Dice Number
Starters 106 Division 2 (Rated)
Playing with OR, Save People, Guess the winner!
Starters 107 Division 2 (Rated)
Rock Paper Scissor, OR Permutation
Starters 108 Division 2 (Rated)
Clan Expansion, Palindromic Prime Numbers
Starters 109 Division 2 (Rated)
Minimum XOR, Best of N Sets, Alter Ego
Starters 112 Division 2 (Rated)
Cursed Indices, 3 Logicians Walk into a Bar, Max Nutrition
Starters 116 Division 2 (Rated)
Chef Product, ORST , Access Control
Starters 117 Division 2 (Rated)
Not Prime Permutation, Spell Shortening
Starters 118 Division 2 (Rated)
Subset GCD, Join States, Xorry 2, Xorry 1
Starters 122 Division 2 (Rated)
Arya In Grid, Transformation Cost, Man of the Match
Starters 124 Division 2 (Rated)
Binary Parity, Table Strength, Swap and Unite, Make It One
Starters 125 Division 2 (Rated)
Fake Certificate, Binary Minimal
Starters 128 Division 2 (Rated)
MEXimize the Array, Disjoint Non-Decreasing Array
Starters 131 Division 2 (Rated)
K-Closeness, Dice Deception, Encrypt Value
Starters 132 Division 2 (Rated)
ALIEN-OR, GAME 11
Starters 133 Division 2 (Rated)
Powered Parameters, Maximum Alternating Sum
Starters 134 Division 2 (Rated)
Origin, Rock Paper Scissors
Starters 135 Division 2 (Rated)
Invert And Equalize, Change A to B
Starters 140 Division 2 (Rated)
Make Permutation, Split Permutation, Trick Or Treat, Tree Removal
Starters 142 Division 2 (Rated)
Chef loves Pizza Chef loves halfs, Array Removal, Number Hunt
Starters 147 Division 2 (Rated till 5 stars)
Truth Teller And Liars 101, Independence Day 101, Non-Primes 101, Gold Coins 101
Starters 148 Division 2 (Rated)
The Undisappearance, FightBots
Starters 149 (Rated)
Easy Subarray Sum, Maximise Sum, Chef Loves Beautiful Strings (Easy Version)