Abu Rayhan Siddike
- rayhan28
Bangladesh- Other
- No Active Plan. View Details
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Learning Paths (0)
Practice Paths (1)
Contests (127)
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)
Starters 150 (Rated)
Equal Pairs (Hard), Find Multiset State, Equal Pairs (Easy)
Starters 151 (rated)
Convert string
Starters 153 (Rated)
Butterfly, Another Game, Colorful Tree (Easy Version), Xometry (Easy Version)
Starters 155 (Rated)
GCD to 1 (Easy), GCD to 1 (Hard), Replace With First, Prefix Suffix Min Max
Starters 158 (Rated)
Largest Subsequence, XOR Smaller, Multiply 2 to Minimize
Starters 162 (Rated)
Empty the String, Adjacent Sum Array, Permutation Mod K
Starters 163 (Rated)
Nice Array, Minimum Types, Sort Them, Lexio Swap
Starters 164 (Rated)
Swap and Flip
Starters 167 (Rated)
Lottery Tickets, Delete Not Equal, Grid Construction (Odd)
Starters 168 (Rated)
No Two Alike, Binary Removals, Make Odd