Zobayer Abedin

September Challenge 2020 Division 2

A Problem on Sticks, Ada Matrix

October Challenge 2020 Division 2

Positive AND, Covid Run, Chef and Easy Queries

November Challenge 2020 Division 2

Restore Sequence, Ada and Dishes, Iron, Magnet and Wall

January Challenge 2021 Division 2

Watching CPL, Fair Elections

January Cook-Off 2021 Division 2

Prime Tuples, Maximise Islands

December Lunchtime 2020 Division 2 (Unrated)

Three Letters, Sed Sequences

January Lunchtime 2021 Division 2 (Unrated)

Binary Subsequence, Even Differences, Even Sum

November Cook-Off 2020 Division 2

Flip the String, Chef and IPC Certificates

October Lunchtime 2020 Division 2

AND Plus OR, Chef Likes Good Sequences

September Lunchtime 2020 Division 2

GCD operations, Watermelon

Byterace IIT Patna Division 2 (Rated)

Angry Cyborg, The Begining Era Of Cyberverse, Cybalphabit

April Cook-Off 2021 Division 2

OR of ANDs, Chocolate Monger

April Lunchtime 2021 Division 2

Chef in Heaven , Bench Press, Array Rotation

May Cook-Off 2021 Division 2

The Last Problem, Chef and Subarrays

May Lunchtime 2021 Division 2

Charges, Tom And Jerry 1, Total Components

June Challenge 2021 Division 2 (Unrated)

Minimum Dual Area, Shortest Route, Bella ciao, Summer Heat

June Cook-Off 2021 Division 2

The Wave

July Challenge 2021 Division 2 (Unrated)

XxOoRr, Chef vs Bharat, Optimal Denomination

July Cook-Off 2021 Division 2

XOR-ORED, Mod Equality

July Lunchtime 2021 Division 2

Beautiful Pairs, Array Rotation Returns, Longest Good Segment

CodeChef Starters 6 Division 2 (Unrated)

Joker and Batman, Even tuples, Three Dices, Cricket Ranking

August Cook-Off 2021 Division 2

Different String, Chef and Closure, Equal Difference

August Lunchtime 2021 Division 2

K-th Maximum, Crossing Blocks, Just a Graph

CodeChef Starters 9 Division 2 (Unrated)

Friend Groups In A Line, Black cells in a chessboard, Large Square, Bus full of passengers, Fibonacci concatenation, India Fights Corona

CodeChef Starters 10 Division 2 (Rated)

Magical Flips, Maximise the Subsequence Sum, Remove One Element

SnackDown 2021 - Online Qualifiers

Lucky Number, Maximum Number Of Distinct Elements

CodeChef Starters 12 Division 2 (Unrated)

K - balanced string, Make it Divisible, Another Shortest Paths Problem, Maximum Points

CodeChef Starters 13 Division 2 (Rated)

Add and Divide, Chef in Vaccination Queue, Maximum Light Up, Interesting Pairs, Magical Doors

September Lunchtime 2021 Division 2

Balanced and Unique Arrays, Alice vs Bob Faceoff, Yet another SOD problem

October Lunchtime 2021 Division 2

Median Rearrangement, Chef and Water Car, Exactly N plus 1 Values

SnackDown 2021 - Online Round 1A

Round Robin Ranks , Dance Moves, Min Max LCM

SnackDown 2021 - Online Round 1B

Queens Placement , Largest Laddu, Help Nishant

CodeChef Starters 19 Division 1 (Unrated)

Indivisible Permutation, The Alternating Sum, Distinct Elements

C.O.D.E.R.S Division 1 (Unrated)

The One Where No One is Ready, The One with Ross Wedding

December Challenge 2021 Division 1 (Unrated)

Valleys and Hills, Rock Paper Scissors, Pyramid Traversal

SnackDown 2021 - Elimination Parallel (Rated for Div 1)

Sorting Segments

Infinity 2k21 Division 1 (Unrated)

Marbles, Hopscotch

January Cook-Off 2022 Division 1

Subsegment Divisibility , Merged LIS

CodeChef Starters 25 Division 2 (Rated)

Building Towers, Equal MEX, Points and Lines

May Cook-Off 2022 Division 2 (Rated)

Doubled Distances

Starters 37 Division 2 (Rated)

Remove Balance, Dazzling Even-Odd Challenge, Beat the Average, Infernos, Maximum OR Minimum

July Cook-Off 2022 Division 2 (Rated)

Permutation And Median, Xor Permutation, Segmentation Fault

Starters 75 Division 2 (Rated)

Chefs Favourite Function, Equal Hamming Distance, Prefix Ones, Three Powers of Two

February Cook-Off 2023 Division 2 (Rated)

Take Not Less, Permutation and Modulus, Minimum Beauty

Starters 79 Division 2 (Rated)

Mountain, One Stone or Two Stones, Add smallest prime factor, Distinct Opposite Sums

Starters 81 Division 2 (Unrated)

Distinct Matrix, Divide Pages

Starters 84 Division 2 (Rated)

SUM OR, Max count of 1, Digit Operation, Max Binary, Chef And Adjacent Sums

Starters 85 Division 2 (Rated)

Crazy Bishops on Chessboard, Efficient PAN Linking, Inside The Stadium, GCD Queries, TripTastic

Starters 86 Division 1 (Rated for All)

Minimum Operation, String Game , Largest Y

Starters 87 Division 1 (Rated till 6 Stars)

Inversions of subsequences, AB plus C, One or All

Starters 88 Division 1 (Rated till 6 Stars)

Maximum And Or, Chef and Asteroids, Minimize the Bits

Starters 91 Division 1 (Rated till 6 Stars)

XOR & Sum, Odd GCD Permutation, Chef Odd, Maximum Sum Permutation

Starters 93 Division 1 (Rated for All)

Thank U, Next, NASA, Greedy

Starters 95 Division 1 (Rated till 6 Stars)

Boxes, Transfusion Chain

Starters 96 Division 1 (Rated till 5 Stars)

Swap the numbers, Mex Array

Starters 97 Division 1 (Rated till 6 Stars)

No Palindrome, Triplets Min

Starters 114 Division 1 (Rated till 6 Stars)

Chef and Tag, Rock-Paper-Scissors

Starters 115 Division 1 (Rated)

Greedy LIS Algorithm, Binary Grid Forces, Make All Zero

Starters 117 Division 1 (Rated till 5-Stars)

Not Prime Permutation

Starters 118 Division 2 (Rated)

Subset GCD, Join States, Is it uniquely decodable, Xorry 2, Xorry 1

Starters 119 Division 1 (Rated till 6-Stars)

K Odd Sum, Unalike Gcd & Lcm

Starters 120 Division 1 (Rated till 6 Stars)

Find Permutation , Construct Permutation, Count Subarrays, Count Arrays

Starters127 Division 1

ABC Conjecture, Anti-Triangle

Starters 128 Division 2 (Rated)

Binary Substring, XOR And Multiply, MEXimize the Array, Disjoint Non-Decreasing Array

Starters 130 Division 1 ( Rated till 6-Stars)

Make Equal

Starters 131 Division 2 (Rated)

K-Closeness, Dice Deception, Encrypt Value, T-Perm

Starters 132 Division 2 (Rated)

ALIEN-OR, Optimal Flip, MEX QUERIES , Prime Query, GAME 11

Starters 135 Division 1 (Rated till 5-Stars)

Change A to B

Starters 136 Division 1 ( Rated till 6-Stars )

Game On Rectangle, Lexicographically Maximal Prefix AND, Sum of Modes

Starters 138 Division 1 (Rated till 6-Stars)

A power B mod C , Prefix Suffix Inequality, Distinct Substring

Starters 139 Division 1 (Rated till 5-Stars)

Sort Perm, Sum of N, Destroying Bridges Part 2

Starters 141 Division 1 (Rated till 5-Stars)

Amphibian Escape, Perfect Prefixes

Starters 142 Division 1 (Rated till 5-Stars)

Array Removal, Number Hunt

Starters 145 Division 1 (Rated till 6-Stars)

Beautiful Array, Make Bob Win , Square String

Starters 146 Division 1 (Rated till 5 stars)

Back Front, Bouncing Ball, Permutation Construction

Starters 147 Division 1 (Rated till 5 stars)

K Subsequence 101, Truth Teller And Liars 101, Independence Day 101, Non-Primes 101, Gold Coins 101

Starters 149 (Rated till 5 stars)

Maximise Sum, Chef Loves Beautiful Strings (Easy Version)

Starters 151 (rated till 5 stars)

Ball Game, Sequence Search

Starters 154 (Rated till 6 stars)

GCD and XOR

Starters 155 (Rated till 5 stars)

GCD to 1 (Hard), Replace With First, Prefix Suffix Min Max

Starters 156 (Rated till 6 stars)

Balance Difficulties, Partition Score

Starters 157 (Rated till 5 stars)

Small, Smaller, Smallest, Normal is Good, Unmedian

Starters 161 (Rated)

Red-Blue Sort, One To Three

Starters 162 (Rated till 5 stars)

Empty the String, MEX of XOR, Permutation Mod K

Starters 166 (Rated till 6 stars)

Distinct Power, Divisors Array (Hard Version), Divisors Array (Easy Version), Costly Permutations, Chefland Library

Starters 167 (Rated till 5 stars)

Lottery Tickets, Grid Construction (Even), Grid Construction (Odd)

Starters 168 (Rated till 6 stars)

No Two Alike, Binary Removals, Equate XOR

Starters 171 (Rated till 5 star)

White Wall, Volcanic Eruption

Starters 174 (Rated upto 2700)

GCD Add Size, Meximal Sum, Mystic Slimes

Starters 181 (Rated for all)

The Best Matrix, Flip Prefix

Starters 182 (Rated till 5 star)

MasterChef, Palindromic Score

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