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(2025-06-11 22:00:00)Ratings System Update
(2022-12-20 00:00:00)Learning Paths (0)
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Contests (133)
December Lunchtime 2017
Days in Month, Strange Function
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, Partition the numbers
January Lunchtime 2018
Chef and Game with Sequence
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel
International Coding League (Rated)
Matrix Game
February Cook-Off 2018
Chef and Cook-Off, Chef and Line
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
March Cook-off 2018 Division 2
Chef Goes to the Cinema, Chef Restores a Matrix, Chef Judges a Competition
April Cook-off 2018 Division 2
Cut the Board
July Cook-Off 2018 Division 2
Encoding Message, OR Matrix
August Cook-Off 2018 Division 2
Mixi Game, Balsa For The Three
September Mega Cook-Off 2018 Division 2
ATM Machine, Make a Permutation
October Mega Cook-Off 2018 Division 2
Binary Nim 2, Ada and the Staircase
March Lunchtime 2018 Division 1 (Unrated)
Magic Elements
May Lunchtime 2018 Division 2
Trace of Matrix
April Challenge 2018 Division 2
Weight of Numbers, Highway Crossing, Average of Pairs, Workers
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again, Dibs on Fibs
June Challenge 2018 Division 2
Binary Shuffle, Naive Chef
July Challenge 2018 Division 2
Magic Set, Strike or Spare
August Challenge 2018 Division 2
Modular GCD, Problem Sort, Sheokand and Number, Spell Bob
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures, Bad Shuffle
December Challenge 2018 Division 1
Chef and Interactive Contests
November Challenge 2018 Division 2
Chef and Ridges, Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Chef and Difficult Contests, Chef and Happiness
October Challenge 2018 Division 2
Appy and Balloons , Minimize Digitsum, Chef and Serves, Byte to Bit
June Lunchtime 2018 Division 2
Summary Power, Counting Pretty Numbers
July Lunchtime 2018 Division 2
Split Stones
August Lunchtime 2018 Division 2
Chef and Problem Setting, Chef and Eid
September Lunchtime 2018 Division 2
Judging Delay, Chef Restaurant
October Lunchtime 2018 Division 2
Three Friends, Coloring the Grid
ALKHWARIZM (Rated)
Help Voldemort
Insomnia 2018 (Rated)
Split Sums, Strange Swaps
Code Melange (Rated)
XD Subsequences, The Deadly Sin, Candy Love
Quick Code (Rated for Division 2)
Immortal Frieza, Majin Vegeta
January Challenge 2019 Division 1
Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, (Challenge) Chef and Matching Game, A Pizza Slice
January Lunchtime 2019 Division 1
Rooks
February Challenge 2019 Division 1
Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, (Challenge) Chef with Orchestra in the Kitchen, Art of Balance
March Cook-Off 2019 Division 1
XOR N-bonacci Sequence, Markers and Caps
August Challenge 2019 Division 1
Guddu and his Mother, Dilemma, Maximize an Expression, Football, Distribute Apples
August Cook-Off 2019 Division 1
Rich Substrings, Chef and Pepperoni Pizza
September Lunchtime 2019 Division 1
All Substrings, Find the Sum
October Challenge 2019 Division 1
Even Edges, Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices
October Lunchtime 2019 Division 1 (Unrated)
Box Game
December Challenge 2019 Division 1
Chefina and Ranges, Plus Multiply, Binary XOR, Easy Subsequence Selection, Sticky Notes, Test Generation, (Challenge) Cubical Virus, That Is My Score!, Addition
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Doofish Matrix, Chefina and Prefix Suffix Sums, English, Chefland Army, (Challenge) Building Anthills
February Challenge 2020 Division 1
Chef and Railway Stations, Expected Change, No Change Required, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Ready Bitwise, Unit GCD, Leaked Answers (Challenge)
April Lunchtime 2020 Division 1
Positive Mex
May Lunchtime 2020 Division 1
Convert the String, Tree difference
Biteration #2 (Rated for Division 2)
A - Books, C - Chef and Maths
Exun Programming Prelims 2019 (Rated for all)
Weird Modulo Problem , Tennis Tournament, Chipped Tree
July Challenge 2020 Division 1
Missing a Point
July Cook-Off 2020 Division 1
Even-tual Reduction, OR-thodox Distinction, Path-etic Products
July Lunchtime 2020 Division 1
Golomb Sequence, Binary Concatenation
August Cook-Off 2020 Division 1
Polygon Relationship
August Lunchtime 2020 Division 1
Game on a Strip
June Cook-Off 2020 Division 1
Per Capita Income
RECode 12.0 (Rated for all)
Chef and String, Chef and Walk, Chef and Numbers
December Challenge 2020 Division 1
Hail XOR, Calculus, Positive Prefixes, Even Pair Sum
December Cook-Off 2020 Division 1
Self-Destructing Strings, Catch the Thief, Circle of Chaos
January Cook-Off 2021 Division 2
Prime Tuples, Maximise Islands
January Lunchtime 2021 Division 1 (Unrated)
Dreams of Divisibility, Even Sum
October Cook-Off 2020 Division 1
Path-etic Sums, Yet Another Crossover Episode
November Cook-Off 2020 Division 1
Flip the String, Chef and IPC Certificates
October Lunchtime 2020 Division 1
Chef Likes Good Sequences, Chef Is Just Throwing Random Words, Cute Chef Gift
Coders' Legacy (Rated for all)
Chef vs Doof, Doof on Cartesian, Doof fires Brackets
September Cook-Off 2020 Division 1
Maximise Subsequence Value
September Lunchtime 2020 Division 1
Root the Tree
Code Ensemble (Rated for Division 2)
Cherry and Bits, Priya and AND, Traversing Trees, Help Martha, Priya and Parity
UWCOI 2021 (Rated for all)
Organisation, Array Swaps, Hidden Numbers
March Cook-Off 2021 Division 1
Consecutive Deletions, Chef and Sorting
February Lunchtime 2021 Division 1
Average Sorting
March Lunchtime 2021 Division 1
Uniform, Lunchtime
April Cook-Off 2021 Division 1
Tree Distances, OR of ANDs
April Lunchtime 2021 Division 1
A Special Tree
May Cook-Off 2021 Division 1
Double Burgers
June Lunchtime 2021 Division 2
From Rational to Binary, False Number, Unpleasant Ones
July Cook-Off 2021 Division 2
XOR-ORED, Mod Equality
July Lunchtime 2021 Division 2
Beautiful Pairs, Array Rotation Returns
August Cook-Off 2021 Division 1
Odd Array, Different String, Clear the Array
CodeChef Starters 10 Division 2 (Rated)
Magical Flips, Maximise the Subsequence Sum, Remove One Element
September Cook-Off 2021 Division 1
Chef and Pairwise Distances, Fake Swaps
SnackDown 2021 - Online Qualifiers
Lucky Number
CodeChef Starters 12 Division 1 (Unrated)
Another Shortest Paths Problem
CodeChef Starters 13 Division 2 (Rated)
Chef in Vaccination Queue, Maximum Light Up, Magical Doors
September Lunchtime 2021 Division 1
Alice vs Bob Faceoff
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
November Challenge 2021 Division 1 (Unrated)
Xor Equation, Maximise the bridges
SnackDown 2021 - Online Pre-Elimination
Product Pain
CodeChef Starters 20 Division 1 (Unrated)
Stable Sequence, Weird Values, Brutal-Xors
FizzBuzz Division 2 (Rated)
Magical Planks, Clean The Sequence, Substring Minimum Function, Can_Reach
November Lunchtime 2021 Division 2
Expected Weight, Subarray Jumps, Strange Minimization, Rapid Re-Orderings
CodeChef Starters 22 Division 1 (Unrated)
Merging Binary Strings, Equal LIS
January Cook-Off 2022 Division 1
Subsegment Divisibility , Merged LIS, Prime Graph, Erase All But One
January Lunchtime 2022 Division 1
Permutation XOR Sum
February Cook-Off 2022 Division 1
Perfect Permutation, PerMEXuation , Mango Market
February Long 2022 - II, Division 1 (Unrated)
Sequence GCD, Bitwise swaps, Xor Palindrome
CodeChef Starters 26 Division 1 (Unrated)
Array Division, Careless Chef
February Lunchtime 2022 Division 1
Magnet Sort
Starters 43 Division 1 (Unrated)
The Optimal Pairs, Permutation AND
July Lunchtime 2022 Division 1 (Rated)
Tree Retrieval, Consecutive XOR, Largest Family
August Lunchtime 2022 Division 1 (Rated)
Subtract 12 Operation
Starters 64 Division 1 (Rated till 5-stars)
Luigi and Uniformity, Prime Factor Division, Distinct Neighbours
Starters 65 Division 1 (Rated for 5 & 6 stars)
Nahaane Jaa, Binod
Starters 68 Division 1 (Rated till 5-stars)
Boring String, XOR Product, Interesting Array, Make Money
Starters 69 Division 1 (Rated till 6-stars)
Distinct Sequence, Longest Subarray
Starters 89 Division 1 (Rated till 5 Stars)
Positive or Negative Subarrays
Starters 90 Division 1 (Rated till 6 Stars)
Crushed Apples and a Balance Scale, Sum of Goodness, Printing Binary Array, Anti Palindrome
Starters 91 Division 1 (Rated till 6 Stars)
Odd GCD Permutation, Chef Odd, Maximum Sum Permutation
Starters 94 Division 2 (Rated)
CodeChef Streak, Possible or Not, Special Operation, The Vowel Matrix
Starters 95 Division 2 (Rated)
Boxes, Transfusion Chain, EVacuate to Moon
Starters 97 Division 1 (Rated till 6 Stars)
Triplets Min
Starters 99 Division 2 (Rated)
Segment Three, Card Swipe, Exclusion-Inclusion
Starters 100 Division 1 (Rated)
Prime Permutation, Stamps 100, Concussive Sequence, Ant
Starters 101 Division 1 (Unrated)
Minimize Xor Difference, Warrior Chef
Starters 102 Division 1 (Rated till 6 Stars)
Parity Permutation, Light The Bulb, Bit Play
Starters 106 Division 1 (Rated till 5 Stars)
Playing with OR, Save People, Guess the winner!
Starters 107 Division 2 (Rated)
Maximal Expression, Rock Paper Scissor, OR Permutation
Starters 109 Division 1 (Rated till 5 Stars)
Minimum XOR, Alter Ego, Chroma Swap
Starters 110 Division 1 (Rated till 5-stars)
Marbles, Am I Lucky!, Monsters, Tetris
Starters 111 Division 2 (Rated)
Beautiful Strings, Reach Codetown
Starters 112 Division 2 (Rated)
Cursed Indices, Max Nutrition
Starters 116 Division 2 (Rated)
Chef Product, ORST , Access Control
Starters 118 Division 2 (Rated)
Subset GCD, Join States, Xorry 2, Xorry 1
Starters 119 Division 2 (Rated)
Cookie Day, Another Good String , K Odd Sum
Starters 120 Division 2 (Rated)
Find Permutation , Construct Permutation, Count Subarrays, Count Arrays, Sub or Swp
Starters 122 Division 2 (Rated)
Arya In Grid, Transformation Cost, Man of the Match
Starters 138 Division 2 (Rated)
A power B mod C , TRIPLE PRIMES, Prefix Suffix Inequality, Long Drive, Distinct Substring
Starters 139 Division 2 (Rated)
Sum of N, Maximum Distance Permutations, Destroying Bridges Part 2
Starters 146 Division 1 (Rated till 5 stars)
Bouncing Ball, Permutation Construction
Starters 152 (Rated)
Maximize Hamming Distance, Completion (Easy), Range Minimize
Starters 166 (Rated)
Distinct Power, Divisors Array (Hard Version), Divisors Array (Easy Version), Costly Permutations, Chefland Library
Starters 167 (Rated till 5 stars)
Temperature Balance, Lottery Tickets, Grid Construction (Even), Grid Construction (Odd)
Starters 190 (Rated till 5 star)
Subsequence Sort, Min-Max Deletion