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(2022-07-17 23:30:00)Ratings System Update
(2022-12-20 00:00:00)Learning Paths (0)
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Contests (159)
August Long Contest 2011
Infinite Grid Game
October Cook-off
Generalized Arithmetic Progression Free Sequence, Chef Travel Routes
November Long Contest 2011
Chefs new Pet
December 2011 Long Contest
Robot Movings
December Cook-Off
Ciel and New Menu, Ciel and A-B Problem
January 2012 Challenge
Houses and Restaurants
February 2012 Cook-off
Daily Train, Equation Solver
March 2012 Challenge
Longest Weird Subsequence, Cosine Partition Function, Lucky Number, Free Shuttle Service, Home Delivery, Spoon in Matrix, Xor it
March Cook-Off 2012
Ciel Numbers I, Ciel Numbers II
April Challenge 2012
Fit to Play, Double Strings, Stacking Pancakes, Greatest Dumpling Fight
April Cook-Off 2012
Top Batsmen, Resistance
May Challenge 2012
Jewels and Stones, Lucky lucky number, Divisible Pairs, Remember the recipe, A Home for Chef
May Cook-Off 2012
Little Elephant and Balance, Little Elephant and Strings
June Challenge 2012
Little Elephant and Product, Little Elephant and Candies, Doom Bakes Cakes, Arranging Cup-cakes
June Cook-Off 2012
Closing the Tweets
July Challenge 2012
Chef's Dream, My Fair Coins, The Gray-Similar Code, Little Elephant and Bubble Sort, Gift Rift, Restaurant Rating, Addition chains
August Challenge 2012
Little Elephant and Bombs, Lucky Driving, Block Game, Range of Data, Delivery Boy, Machine Gun
August Cook-Off 2012
Forced Output, Code Crazy Minions
September Challenge 2012
Kisses & Hugs, Chef World, Racing Horses, Queries About Numbers, ChefTown Parade, Three is Crowd
October Challenge 2012
Team Formation, Little Elephant and Order, Fierce Battles, Event Organizer, Maximum Sub-rectangle in Matrix, Blade Master, The New Scheme, Need More Diamonds
September Cook-Off 2012
Prime Permutations, Recipe Reconstruction, Carvans, Coal Scam
October Cook-Off 2012
Buying Sweets, Equalization, Tennis Tournament
November Challenge 2012
Lucky Balance, A Wonderful Chocolate, Delicious Dishes, Candy Collecting Game, Coin Flip, Jam Board, Many Left, Sridhar Likes Travelling
November Cook-Off 2012
Little Elephant and Permutations, Little Elephant and Divisors
December Challenge 2012
Sereja and Data Structures , Granama Recipes, Book Exercises, Magic Rankings, The Uncountable Ways, Pizza Delivery
January Challenge 2013
Little Elephant and Alcohol, Dividing Products, The Minimum Number Of Moves, End Of The World, Chef of the Year, Three Different Numbers
February 2013 Challenge
Little Elephant and Cards, Buy1-Get1, Climbing Stairs, Word Play
February Cook-Off 2013
Lack of Logic, Row and Column Operations, Hotel Balifornia 2
March Challenge 2013
Tourist Translations, Approximately, Fire Escape Routes
March Cook-off 2013
The Ball And Cups, Palindrome
April Challenge 2013
Little Elephant and Music, Barcelona Gameplay Tactics, ChefGame, Kingdom Unity, Fault Tolerance, Maximum Weight Difference, Levy Conjecture
April Cook-Off 2013
Andrew and the Birthday, Andrew and the Meatballs, Andrew and the Strings, Andrew and the Meatballs again
May Challenge 2013
Matchsticks, Witua and Math, Tree Counting, Password Cracking Challenge, Juno Puzzle for May, Name Reduction, Your Name is Mine, Field Trip
June Challenge 2013
Little Elephant and Mouses, Collecting Magical Berries, Just Some Permutations 3, Dessert Wizard, Two k-Convex Polygons, Count Special Matrices, Predictopus, To challenge or not, W String, Lapindromes
May Cook-off 2013
Subtraction Game 1, Subtraction Game 2
June Cook-Off 2013
Attic Crossing, Lyra and the Alethiometer
July Challenge 2013
Mountain Holidays, Galactik Football, The Probability Of Winning, Chef and Walking on the rectangle , Count K-Primes, Circle of death
July Cook-off 2013
Chopsticks, Compressed String, A Plus B Again!
Lunch Time July 2013
Cooking dishes, Paying optimally
August Challenge 2013
Little Elephant and Lemonade, Music & Lyrics, Hello Hello, Save The Princess, The Number Of Solutions, Chef and Segments, Sereja and Ballons, Deleting numbers, Splitting Candies
August Cook-Off 2013
Chef and The Right Triangles, Chef and The Divisibility Queries, Chef and The String of Digits
August Lunchtime 2013
Pairwise AND sum, Matrix
September Challenge 2013
Little Elephant and Exams, Cool Guys, Chef and Integers , Project Spoon, CAO Stage-1, CAO Stage-2
October Cook-Off 2013
Polo the Penguin and the Lucky String, Polo the Penguin and the Numbers, Polo the Penguin and the Test, Polo the Penguin and the XOR
September Lunchtime 2013
Chef and Magic Numbers , Chef and Gift, Chef and Pie, Chef and Science
November Cook-off 2013
Am I a Fibonacci Number, Lowest Sum, Number of Paths, Trees and Subtrees, Rank of the Number
February Cook-Off 2014
Chef and Remissness, Chef and Kingship, Chef and Reunion
March Cook-Off 2014
Game of Divisors, ABC-Strings, 3-Palindromes, Dividing Stamps
May Cook-Off 2014
Book Game with Chef, Divide the Cake, Ups and Downs
August Cook-Off 2014
Tree Game, Permutation Shuffle
April LunchTime 2014
Minimum Product, Minion Circle, Knight Fork, Tracy and Charlie
May Lunchtime 2014
Divisible Subset, Approximately II
June Lunchtime 2014
Coprime Triples, The Smallest Pair, Dynamic Inversion
November Lunchtime 2014
A wolf, a sheep and cabbage, Deja Vu, Yet another substring problem, Dividing the Students
December Lunchtime 2014
Delivery Man, Sum Of Binomial Coefficent , Queries On Tree, String Matching
November Challenge 2015
Ingredients, Receipt Recovery, Chef and collection of stamps, Eugene and function, Simple Sum, Chef and cakes, Period on tree
February Cook-Off 2015
Zombinatorial, Parenthesis with Maximum Sum Subarray, Fit Squares in Triangle, Strategy for the World Cup
March Cook-Off 2015
How to Minimize a String, How to Choose a Subset, How to Write a Message, How to Repaint a Fence
April Cook-Off 2015
Lucky Fives, Special Agents, Taxi Driver, Equality, Version Control System
May Cook-Off 2015
Devu, his friends and birthday gifts, Devu and friendship testing, Devu and decorating birthday cake, Devu and most energetic minion
June Cook-Off 2015
Ankit, Srijan and a game of stone piles, Longest non regular parentheses sub-sequence, Strange operations
July Cook-Off 2015
Cops and the Thief Devu, Maximize Disjoint Pair Sum, Path containing K Nodes, Adding Special Sum
August Cook-Off 2015
Chef and the XORed Number , Chef and the Wildcard Matching
October Cook-Off 2015
Palindrome Pairs, Second LIS, Word Stem, Almost Sorted Permutation
February Lunchtime 2015
Lucky Four, The Warehouse
June Lunchtime 2015
Chef and Bitwise OR Operation, Chef and Submatrix, Chef and Two Strings, Chef and Sets
July Lunchtime 2015
Greedy puppy, Puppy and GCD, Puppy and game, Puppy and cats
August Lunchtime 2015
Churu and lost string, Gaming Inversion, Make Palindrome, Minimum Maximum
December Lunchtime 2015
Computer Network, Ancient Berland Roads, Buying Seedlings, Distinct Codes
January Cook-Off 2016
Chef and Destruction, Chef and Maximum Sum Matrices , Chef And Fibonacci Tree, Chef and Fruits
February Cook-Off 2016
Puppy and Palindromes, Puppy and Triangles, Puppy and Catchers, Puppy and Board, Puppy and Sum
March Cook-Off 2016
Not even planar, Digital clock, Dual Nim, Alternating subarray prefix
May Cook-Off 2016
Phantasialand
June Cook-Off 2016
Sticks, Right Triangle, Chef Land, Range Minimum Queries
July Cook-Off 2016
Chef and Proportion, Chef and Numbers, Chef and Land, Chef and Array
September Cook-Off 2016
Lazy Jem, The Lost Arithmetic Sequences, Counting Strings, Shortest path queries, Find The Point
October Cook-Off 2016
Sherlock and the Ugly Flower, Watson asks Does Permutation Exist, Sherlock Counts Ways, ChefWatson uses Social Network, Sherlock and Smallest Window
November Cook-Off 2016
Sebi and the highway, Sebi and the corrupt goverment
February Lunchtime 2016
Chef and Socks, Chef and Tic-Tac-Toe, Chef and Polygons, Chef and Dominating Subarrays
September Lunchtime 2016
Chef and Inequality
November Lunchtime 2016
Chef and his Students, Chef and Square Set
December Lunchtime 2016
Superheroes and villains, Fly height mode, MST Queries
February Cook-Off 2017
Download file, Chairs, Cooking Game
April Challenge 2017
Chef and Digits, (CH) Serejs and Billiards, Bear and Random Grid, Chef and Divisor Tree, Stable market, Heavy-Light Decomposition, Dish Of Life, Bear and Row 01, Bear and Clique Distances, Similar Dishes
March Cook-Off 2017
Rainbow Graph, Meeting location, Yet Another Card Game, Increasing Xor Sequence, Safe Robot
June Cook-Off 2017
Ada and crayons, Knight Covering, A Study in Bake Street, SnackUp, Centeroid
August Cook-Off 2017
Game on Stick, Matrix and Chef, Real obtuse, From heaven to earth
March Lunchtime 2017
Bear and Haircut, Bear and Ladder, Bear and Species
April Lunchtime 2017
Bear and Digit Virus, Bear and Segments, Closest points queries, Bear and Segment 01
June Lunchtime 2017
Maximum Unique Segment, Two Numbers, Company and Club Hierarchies
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams, Mathison and the teleportation game
March Cook-off 2018 Division 1
Chef Goes to the Cinema, Chef Restores an Array, Chef Chooses a Subset, Chef Restores a Matrix
April Cook-off 2018 Division 1
Run Direction, Binary Nim, Chef Goro, Hamel Paths
May Cook-off 2018 Division 1
Difficult Choice, Best Cake Ever, Searching for the Recipe
July Cook-Off 2018 Division 1
Sticks, OR Matrix, Finding Second Maximum, Chef and GCD Game
September Mega Cook-Off 2018 Division 1
OneTwo, Learning Dishes, Make a Permutation, Ghayeeth vs Siroj
May Lunchtime 2018 Division 1
Count Substrings, Shifted Palindrome, Weak in the Middle, Maximum Plus
July Lunchtime 2018 Division 1
Forced Particles, GCD Sum, Make a String, Prime divisors
September Lunchtime 2018 Division 1
Biased Judgement, Opposite Cites, Chef Restaurant , Match the Streams, Coin Partition
November Lunchtime 2018 Division 1
Useful Number, Median, Maximize It, Probability, Beats and Pieces
December Lunchtime 2018 Division 1
Choosing from Buckets, Drawing Lines, Maximize the NOSS, Find Best Path, Age Calculator
January Lunchtime 2019 Division 1
Distances, Wanderer, Rooks, Mouse Meets Cheese
February Cook-Off 2019 Division 1
Max Range Queries, Chef and Secret Password, The Most Amazing Dish, Chef and Party
February Lunchtime 2019 Division 1
Roll the Bar, Families of Chefland, Create Permutation, The Tricky Deal, Chef Challenge
March Cook-Off 2019 Division 1
XOR N-bonacci Sequence, Points and Convex Hulls, Markers and Caps, Music Shopping
March Lunchtime 2019 Division 1
Corrupted Seven-Segment Display, Tree Flow, Travelling Saleschef, Partition into Permutations
April Cook-Off 2019 Division 1
Doubly Increasing Path, Random Game, Pied Piper vs Hooli, Mystery Tree, Guess My Age
May Cook-Off 2019 Division 1
Misha and Nice Sets, Bitsetbaba and Power Grid, Expected Xor, Searching for a Biclique
May Lunchtime 2019 Division 1 (Unrated)
Grid Tour, Reverse Maximisation, XOR Magic, Abdullah and Toll Discounts
June Lunchtime 2019 Division 1
Fuzzy Conversions, The Grux Permutation , Gii and His Club, Igzi and Burly Array, Ivan Pesic and His World Tour
July Cook-Off 2019 Division 1
Birthday Gift Again, War in Treeland Again, Minimum and Maximum, Expected Product
September Mega Cook-Off 2019 Division 1
Save Jewels, Angry Grandfather, Palindromes Machine, Hiring Chefs, Fitness Exercises
October Lunchtime 2019 Division 1 (Unrated)
Counting Inversions Again!, Box Game, Kth Numbers
November Lunchtime 2019 Division 1
Planting Trees, Washing Windows, Perfection, Servers
December Cook-Off 2019 Division 1
Xor It, Crash It, The Inexplicable Giant Floating Baby Head
February Cook-Off 2020 Division 1
Must Be Divisible, Maximum Subsequence Sum, XOR Game, Sweetest Candy , Chef and Pepperoni Pizza Again
March Cook-Off 2020 Division 1
Mysterious Sequence, A Tree to Remember, Maximize Letter Beauty, Random Chocolates, Escape the Tree
April Cook-Off 2020 Division 1
Maximum GCD Subset, Tower Counting, The Gifting Problem, Simple Operations, Inversions in Permutations
January Lunchtime 2020 Division 1
Construct Array, Under the Tunnels, Folding Paper
February Lunchtime 2020 Division 1
Painter Problem, Swapping to Palindrome, Monsters Battle, Secret Mission
May Lunchtime 2020 Division 1
Absolute Min Max, Escape One, Convert the String, Tree difference
UWCOI 2020 (Rated for all)
Button Pairs, Base Plans, Find maximum in an Array, Blocks, Mercury Poisoning, Escape
July Cook-Off 2020 Division 1
What Is This, a Crossover Episode, The In-XOR-able Task, Even-tual Reduction, OR-thodox Distinction, Path-etic Products
August Cook-Off 2020 Division 1
Red-blue Trees, Polygon Relationship, Chefina and Dishes, Beautiful Subsequence
June Lunchtime 2020 Division 1
Maximum AND, Chef, Chefina and Restoration, Kuroni and the Cowsheds, Gold Mining, Square Submatrices
December Cook-Off 2020 Division 1
Mysterious Sequence, Self-Destructing Strings, Sed Passwords, Circle of Chaos, Carry All Fruits
December Lunchtime 2020 Division 1 (Unrated)
Three Letters, One Zero Swaps
January Lunchtime 2021 Division 1 (Unrated)
Good Grid, Shifting Spoons, Dreams of Divisibility, Even Sum
October Cook-Off 2020 Division 1
Path-etic Sums, An Inveractive Problem, The In-XOR-able Task, Yet Another Crossover Episode
November Cook-Off 2020 Division 1
Flip the String, Chef and IPC Certificates, Communication Channel, Hiring Workers
October Lunchtime 2020 Division 1
Chef Likes Good Sequences, Chef Is Just Throwing Random Words, Counting Spaghetti, Cute Chef Gift
November Lunchtime 2020 Division 1
Gasoline, Rook Path, Fractions, Circle Eating
September Cook-Off 2020 Division 1
Joined Subarrays on Tree, Balancing Game, Maximise Subsequence Value, Minimum Insertions
September Lunchtime 2020 Division 1
Root the Tree, Robot Detector
UWCOI 2021 (Rated for all)
Organisation, City Mapping 2, Array Swaps, Efficient Delivery, Hidden Numbers, Binary Puzzle
March Cook-Off 2021 Division 1
Consecutive Deletions, Water Transfer, Sort String, Chef and Sorting
February Lunchtime 2021 Division 1
Average Sorting, Sed Max, Chef and Reordering, Independent Set
April Cook-Off 2021 Division 1
Tree Distances, OR of ANDs, Valet Parking, Deletion Sort
April Lunchtime 2021 Division 1
A Special Tree, Hackerman, Intersection Matrix
May Lunchtime 2021 Division 1
Tokens On A Tree, Interactive MST, Similar Arrays, Total Components, K-Subarrays
June Cook-Off 2021 Division 1
Binary String on Steroids, Battle Royale, Polynomial Root
July Cook-Off 2021 Division 1
Beautiful Subsequence, Mod Equality, A Special Tree 2, Hidden Colored Graph, Make the Matrix Beautiful
July Lunchtime 2021 Division 1
Xor Separation, Longest Good Segment, Bad Luck
August Cook-Off 2021 Division 1
Odd Array, Different String, Chef 2 Chef, Interactive Equivalency, Clear the Array
August Lunchtime 2021 Division 1
Bunny Hops, Min-Max Path, Just a Graph, Longest Spanning Substrings, Chef and Deque
September Cook-Off 2021 Division 1
Chess Kings Chasing Game, Chef and Pairwise Distances, Permutation and GCD Set, Half Sequence, Fake Swaps
October Cook-Off 2021 Division 1
Can You Reach The End, Second Player, Find the Modulus, Chef Up, Permutation Sorting Game
October Lunchtime 2021 Division 1
Median Rearrangement, Tree Upshot, Maximum GCD
November Lunchtime 2021 Division 1
Min-Max Rotations, Permutation Pairs, Subarray Jumps
December Cook-Off 2021 Division 1
Binary String Game, Destructive Nim, RGB Construction, Break the Balance
December Lunchtime 2021 Division 1
In-tree-active Node Coloring, Optimal Sorting, Romantic Reversals, Sleep Technique
January Cook-Off 2022 Division 1
Subsegment Divisibility , Merged LIS, Boring Trip, Prime Graph, Erase All But One
January Lunchtime 2022 Division 1
Circular Permutation Recovery, Permutation XOR Sum, Permutation Deletion, Divisible Distances
February Cook-Off 2022 Division 1
Xor Becoming Uncanny, Perfect Permutation, PerMEXuation , Mango Market, Slingshot
February Lunchtime 2022 Division 1
Permutation Xor, Chef Cooks Permutation, Bracket Removal, Visit Them All, Magical Modulo, Magnet Sort
March Cook-Off 2022 Division 1
Secret Tree, Dragonado And XOR, Flippable Points, Oh I Dont Care, Alternating Divisibility
March Lunchtime 2022 Division 1
Subsequence, Mathology, Sussy Rooks, Winter, Adjacency Love, Separate Them All
April Cook-Off 2022 Division 1
Chef Goes Shopping, Sorted Distances, Sequence Cost, Max LCA Sum
April Lunchtime 2022 Division 1(Rated)
Modular Circular Permutations, Do Not Touch the MEX!!!, Secret Machine Mania
May Cook-Off 2022 Division 1 (Rated)
Split Powers Of 2, Different Subarrays Rearrange, Triple Inversions
May Lunchtime 2022 Division 1 (Rated)
Balanced 0-1 Tree, Equal After And, Rearrange Ranges
July Cook-Off 2022 Division 1 (Rated)
String Break, Partition Queries, Segmentation Fault, Subsequence LCM
June Cook-Off 2022 Division 1 (Rated)
Permutation Segments, Throw and Take, Simple XOR, Prefix Suffix Distinct, Split AND Sum
June Lunchtime 2022 Division 1 (Rated)
The Lost Array, Max Shift After XOR, XOR Times 2 Is Sum, Minimum Xor On Segment, XOR, The Detective, Increase to Zero
July Lunchtime 2022 Division 1 (Rated)
Tree Interval Queries, Tree Retrieval, Binary String Happiness, Consecutive XOR, Largest Family