fuad hasan

Practice: 

Connecting Soldiers, Three Different Numbers, Dessert Wizard, Maxim and Dividers, Tasty Dishes, Chef and Girlfriend, Chef and String, Ups and Downs, Sherlock and the Grid, Chef and easy problem, XOR with Subset, Mahesh and his lost array, Delivery Man, Fit Squares in Triangle, Merge Sort, Super Hashing, Alternating subarray prefix, Kisses 2, Tree Height, Voting Fraud, IPC Trainers, String Merging, Minimum Deletions, Family Tree, Appy and Balloons , Minimize Digitsum, Chef and Ridges, Chef Restaurant , Appy Loves One, Weird Question, Truth and Dare, Beautiful Garland, Chef and An Ideal Problem, Chef and Modulo Game, Chef and Secret Password, Meera and Her Closet, XOR N-bonacci Sequence, Markers and Caps, Subtree Removal, Pied Piper vs Hooli, Matches, Fast Food, Minimum Sum, Sum and GCD, Drink Slush, Birthday Gift Again, Easy Math, Swapping, Chef and Dynamo, Lazy Chozi, Rich Substrings, Grumpy Granny, Richies Mountain, Chefina and Prefix Suffix Sums, Washing Windows, Change It, Stupid Machine, Check Algorithm, Guess the number, Expected Change, Squared Subsequences, Exploring Undiscovered Planets, Range AND, Chefina and Swap, Chef and Pepperoni Pizza Again, Base Plans, Swapping to Palindrome, Not All Flavours, Secret Mission, Maximize LCM, Strip in a Tree!, Leaked Answers (Challenge), Tower Counting, Maximum AND, Triangle Query, Roads in Chefland, Subsequence Frequency Counting, Laxman and Maths, Raavan and Sub-Array, Bharat and Possibilities, Lord Ram and XorOrXorOr Power, Doctor Chef, Gold Mining, Square Submatrices, Chef and Trump Cards, What Is This, a Crossover Episode, Cherry and Bits, Find XOR, Red-blue Trees, Mode of Frequencies, Coronavirus Spread 2, Maximise Subsequence Value, Bulbs and Wires, Bowling Strategy, GCD operations, Root the Tree, Watermelon, Hail XOR, An Inveractive Problem, The In-XOR-able Task, AND Plus OR, Chef and Subtree MEXs, Chef Likes Good Sequences, Chef Is Just Throwing Random Words, Cute Chef Gift, Positive Prefixes, Team Name, Sed Sequences, One Zero Swaps

Past ZCO Problems: 

Matched Brackets, Round Table, Tournament, Chewing, Video Game, SUPW, Smart Phone, IPL, Break Up, Variation

December Challenge 2018 Division 2: 

Chef and Interactive Contests

November Challenge 2018 Division 2: 

Chef and Difficult Contests, Chef and Happiness

October Challenge 2018 Division 2: 

Chef and Serves, Byte to Bit

October Lunchtime 2018 Division 2: 

Three Friends, Coloring the Grid

January Challenge 2019 Division 2: 

Lucky Number Game, Distinct Pairs, Fancy Quotes

February Challenge 2019 Division 2: 

Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Art of Balance, Deputy Chef

February Cook-Off 2019 Division 2: 

Max Range Queries, Buying New Tablet, Chef and Party

March Challenge 2019 Division 2: 

Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit

March Cook-Off 2019 Division 2: 

UEFA Champions League

April Challenge 2019 Division 2: 

Friend or Girlfriend, Maximum Remaining, Fencing

April Cook-Off 2019 Division 2: 

Making a Meal

May Challenge 2019 Division 2: 

Reduce to One

June Cook-Off 2019 Division 2: 

Multiple Choice Exam, Ants and Anteaters, Eat Twice

June Lunchtime 2019 Division 2: 

Ping Paja Pong, Magda and Silly Pairs, Igzi and Burly Array

August Challenge 2019 Division 2: 

Guddu and his Mother, Dilemma, Football, Distribute Apples, Zombie and the Caves

September Challenge 2019 Division 2: 

Chef and Good Subsequences, Easy Fibonacci, Chef and Interesting Subsequences

November Challenge 2019 Division 2: 

Weapon Value

December Challenge 2019 Division 2: 

Plus Multiply, That Is My Score!

January Challenge 2020 Division 2: 

Breaking Bricks

February Challenge 2020 Division 2: 

The Theatre Problem, School of Geometry, Hard Cash

March Challenge 2020 Division 2: 

XOR Engine, Ada Bishop 2, Pintu and Fruits

April Challenge 2020 Division 2: 

Strange Number, Unit GCD, Sell All the Cars, COVID Pandemic and Long Queue

April Cook-Off 2020 Division 2: 

Matrix Decomposition, Lift Requests, Simple Operations

March Lunchtime 2020 Division 2 (Unrated): 

Chef Swaps Digits, Good Prefix

April Lunchtime 2020 Division 2: 

Another Birthday Present!, Positive Mex, Chef in Fantasy League

UWCOI 2020 (Rated for all): 

Button Pairs, Peak Finding

June Challenge 2020 Division 1: 

The Tom and Jerry Game!

July Challenge 2020 Division 2: 

Ada King, Chefina and Swaps, Missing a Point, Chef and Card Game, Chef and Strings

August Challenge 2020 Division 2: 

Chef Wars - Return of the Jedi, Another Card Game Problem, Chef and Linear Chess, Smallest KMP, Chef and Wedding Arrangements

September Challenge 2020 Division 2: 

A Problem on Sticks, Ada Matrix

July Lunchtime 2020 Division 2: 

Chef and Steps, Maximum Candies

August Cook-Off 2020 Division 2: 

Polygon Relationship, Chef and Work, K-Foldable String

October Challenge 2020 Division 2: 

Covid Run, Chef and Easy Queries

November Challenge 2020 Division 2: 

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

December Challenge 2020 Division 2: 

Even Pair Sum, Vaccine Production, Vaccine Distribution

October Cook-Off 2020 Division 2: 

Split the Str Ing, Decreasing Srrnmieeda, Path-etic Sums, Yet Another Crossover Episode

Code Ensemble (Rated for Division 2): 

Priya and AND, Help Martha

Encoding August'20: 

Notebook Distribution, Naruto and One Shot, Chef And His House , Angry Delta, Delta and Jumps, Chef Loves Cakes, Chef Learns BST

January Challenge 2021 Division 3: 

Watching CPL, Fair Elections, Chef and Division 3, Point Of Impact, Encoded String

April Challenge 2021 Division 2: 

Worthy Matrix, Chef and Dice

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