Arafat Rahman

Practice: 

Prime Generator, Marbles, Substrings on a Tree, Arithmetic Progressions, Barcelona Gameplay Tactics, Level Of Difference, Mountain Holidays, Furik and Rubik and Sub Array, Prime Distance On Tree, Sherlock and Inversions, A Story with Strings, Chef and Graph Queries, Substring Query, Coprime Triples, Queries On Tree, Palindromeness, Chef and String, Nikitosh and xor, Jump mission, Cyclist Race, The potato problem, Polygon, Alliances, Travelling in a tree, Bear and Shuffled Points, Captain Virat and His Strategy!, Hit the Coconuts, Four Friends, Fast forward travelling, Pizza Delivery, Palindromic Walks, Maximum Distance, Up for a Game, Bitsetbaba and Power Grid, Minimum and Maximum, Expected Product, Weighted Necklace, IPL Begins, Walk 4 steps, Cumulative Palindrome Count, Folding Paper, Tokens On A Tree, SC and his recursion

April Challenge 2017: 

Dish Of Life, Similar Dishes

May Challenge 2017: 

Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers

July Challenge 2017: 

Chef and Sign Sequences, Whats in the Name, Calculator , IPC Trainers

August Long Challenge 2017: 

Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates

September Challenge 2017: 

Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums

October Challenge 2017: 

Chef and a great voluntary Program, Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest

November Challenge 2017: 

Chef Hates Palindromes, Chef and Subarray Queries, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes

December Challenge 2017: 

Total Diamonds, Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays

August Cook-Off 2017: 

Real obtuse, From heaven to earth

October Cook-Off 2017: 

Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries

January Challenge 2018: 

K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers

January Cook-Off 2018: 

Multiple of 3, Survive in ChocoLand

January Lunchtime 2018: 

Chef and Game with Sequence, Chef and Escaping from the Labyrinth

February Challenge 2018: 

Chef And His Characters, Chef And The Patents, Akanksha and End of Semester, Points Inside A Polygon, Car-pal Tunnel, Permutation and Palindrome

February Cook-Off 2018: 

Chef and Cook-Off, Chef and Tuples, Chef and Line

February Lunchtime 2018: 

Game with numbers, Jumping in the hills

March Cook-off 2018 Division 1: 

Chef Goes to the Cinema, Chef Restores a Matrix

April Cook-off 2018 Division 1: 

Binary Nim

October Mega Cook-Off 2018 Division 1: 

Binary Nim 2, Pumping Water

April Lunchtime 2018 Division 1: 

The hardest gcd problem, Triple-tree decomposition

May Lunchtime 2018 Division 1: 

Count Substrings, Shifted Palindrome, Maximum Plus

April Challenge 2018 Division 1: 

Chef and Array (Challenge), Cutting Plants, Highway Crossing, Count Good Prefixes

July Challenge 2018 Division 1: 

Reach Equilibrium, Gears

August Challenge 2018 Division 1: 

Modular GCD

September Challenge 2018 Division 1: 

Chef and Condition Zero (Challenge), Table Game, Bad Shuffle

December Challenge 2018 Division 1: 

(Challenge) Delete DAG, Max and Electrical Panel, Directing Edges, Chef and Interactive XOR

November Challenge 2018 Division 1: 

Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Magician versus Chef 2

October Challenge 2018 Division 1: 

Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, Coprime Components

July Lunchtime 2018 Division 1: 

Forced Particles, Prime divisors

September Lunchtime 2018 Division 1: 

Opposite Cites, Chef Restaurant

November Lunchtime 2018 Division 1: 

Useful Number, Beats and Pieces

January Challenge 2019 Division 1: 

Yet Another Problem About Sequences, Different Neighbours, Distinct Pairs

January Cook-Off 2019 Division 1: 

Ada School

February Challenge 2019 Division 2: 

Manhattan Rectangle, Guess It Right, Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Art of Balance, Deputy Chef

February Cook-Off 2019 Division 1: 

Max Range Queries, Chef and Secret Password, Chef and Party

March Challenge 2019 Division 1: 

Chef and Soccer, Cheating on Queue, Yet Again a Subarray Problem, Matchable Permutations

Coders' Legacy 2019 (Rated for all): 

Bathwater, IPL and RCB

April Challenge 2019 Division 1: 

Offer for Chef, Kira Loves Palindromes, Mininum XOR over Tree, Playing with Numbers, Subtree Removal

June Lunchtime 2019 Division 1: 

The Grux Permutation , Gii and His Club, Igzi and Burly Array, Ivan Pesic and His World Tour

July Challenge 2019 Division 1: 

Hit the Coconuts, Snake and Apple Tree, Circular Merging

August Challenge 2019 Division 1: 

Guddu and his Mother

August Lunchtime 2019 Division 1: 

Destroy Cells, Chef Does Coke Yet Again

September Mega Cook-Off 2019 Division 1: 

Fitness Exercises

October Challenge 2019 Division 1: 

Even Edges, Bacterial Reproduction, Chef and Maximum Star Value, Array Modification

November Lunchtime 2019 Division 1: 

Team Trees, Planting Trees, Washing Windows, Perfection

Alkhwarizm (Rated for all): 

Cersei and her Soldiers, Weirwood Trees, Danny Wants To Know

January Lunchtime 2020 Division 1: 

Construct Array, Under the Tunnels

February Lunchtime 2020 Division 1: 

Swapping to Palindrome, Monsters Battle, Secret Mission

March Challenge 2021 Division 1: 

Consecutive Adding, Paparazzi Gennady, Space Arrays, Maximum Topological Sort

April Challenge 2021 Division 1: 

Binary String MEX, Worthy Matrix, Chef and Dice, Boolean Game

May Challenge 2021 Division 1 (Unrated): 

Tree House

July Cook-Off 2021 Division 1: 

Beautiful Subsequence, Mod Equality, Hidden Colored Graph

SnackDown 2021 - Online Qualifiers: 

Prefix as a Substring 2, Lucky Number, Maximum Number Of Distinct Elements, Minimise Difference

SnackDown 2021 - Online Round 1A: 

Round Robin Ranks , Dance Moves, Equal Beauty, Min Max LCM

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