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(2025-06-18 22:00:00)Ratings System Update
(2022-12-20 00:00:00)Learning Paths (0)
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Contests (87)
October Cook-Off 2014
The Army
December Challenge 2014
XOR with Subset, Chef and Apple Trees
February Challenge 2015
Chef and Chain
March Challenge 2015
Chef and Notebooks
April Challenge 2015
Chef and Interview, Broken Telephone
April Cook-Off 2015
Equality, Version Control System
May Cook-Off 2015
Devu and friendship testing, Devu and decorating birthday cake
October Cook-Off 2015
Word Stem, Almost Sorted Permutation
October Lunchtime 2015
emitL
March Cook-Off 2016
Digital clock, Alternating subarray prefix
July Cook-Off 2016
Chef and Proportion, Chef and Numbers
January Lunchtime 2016
Triangle Classification
February Lunchtime 2016
Chef and Socks, Chef and Tic-Tac-Toe
July Lunchtime 2016
Drumpf for President!, Lumpy - The Bus Driver
September Cook-Off 2017
Statistics Construction, Subsequence Equality
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
July Lunchtime 2017
Find the Maximum Value
October Lunchtime 2017
Buggy Calculator
January Cook-Off 2018
Multiple of 3, Survive in ChocoLand
February Lunchtime 2018
Game with numbers, Jumping in the hills
March Cook-off 2018 Division 1
Chef Goes to the Cinema, Chef Restores an Array, Chef Restores a Matrix
October Lunchtime 2018 Division 1
Coloring the Grid
December Cook-Off 2020 Division 1
Self-Destructing Strings, Circle of Chaos
November Lunchtime 2020 Division 1
Gasoline
Starters 84 Division 1 (Rated till 6 Stars)
SUM OR, Max count of 1, Digit Operation, Chef And Adjacent Sums
Starters 86 Division 1 (Rated for All)
Least Size, Minimum Operation, String Game , Largest Y
Starters 87 Division 1 (Rated till 6 Stars)
Count the Permutations (always), Inversions of subsequences, AB plus C, One or All
Starters 83 Division 1 (Rated)
Construct String, Order by XOR, Rotate to Minimum
Starters 88 Division 1 (Rated till 6 Stars)
Maximum And Or, Chef and Asteroids, Minimize the Bits, Chef and Good Array
Starters 89 Division 1 (Rated till 5 Stars)
Positive or Negative Subarrays, Subarray Removal, Two Averages
Starters 90 Division 1 (Rated till 6 Stars)
Crushed Apples and a Balance Scale, Minimum Ugliness, Sum of Goodness, Printing Binary Array, Anti Palindrome
Starters 91 Division 1 (Rated till 6 Stars)
XOR & Sum, Limited Shopping, Odd GCD Permutation, Chef Odd, Maximum Sum Permutation
Starters 92 Division 1 (Rated till 6 Stars)
Rectangular Tiling, Beautification of array, Distance Coloring
Starters 93 Division 1 (Rated for All)
Thank U, Next, NASA, Bloodline
Starters 94 Division 1 (Rated till 5 Stars)
Possible or Not, Search for 404, Special Operation, The Vowel Matrix, Rank Queries
Starters 95 Division 1 (Rated till 6 Stars)
Boxes, Transfusion Chain
Starters 96 Division 1 (Rated till 5 Stars)
Swap the numbers, Mex Array, Absolute Differences
Starters 97 Division 1 (Rated till 6 Stars)
Make It Special, Unreachability Cost, No Palindrome, Triplets Min
Starters 98 Division 1 (Rated till 6 Stars)
3-Blast Palindrome, Build Towers, Ball Distribution
Starters 99 Division 1 (Rated till 6 Stars)
Segment Three, Two Piles, 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, Chef Segment, Bit Play
Starters 103 Division 1 (Rated till 6 Stars)
Squarified, Unique xor, Divisible By 8
Starters 104 Division 1 (Rated till 6 Stars)
Find Diameter, Lexicographically Largest , Construct An Array, Maximise Sum
Starters 105 Division 1 (Rated till 6 Stars)
Spooky Sequences, Dull Operation, Wishcraft
Starters 106 Division 1 (Rated till 5 Stars)
Playing with OR, Save People, Guess the winner!, Count Possibilities, Reach Anywhere
Starters 107 Division 1 (Rated till 6 Stars)
Maximal Expression, Adjacent Flips, Odd Matrix, OR Permutation
Starters 108 Division 1 (Rated till 6 Stars)
Palindromic Prime Numbers, Fair Distribution, Multiple of 9
Starters 109 Division 1 (Rated till 5 Stars)
Minimum XOR, Chef Lost an Array, Alter Ego, Chroma Swap
Starters 110 Division 1 (Rated till 5-stars)
Marbles, Am I Lucky!, Tom and Jerry, Monsters, Tetris
Starters 111 Division 1 (Rated till 6 Stars)
LCM Mania, Prefixing, Beautiful Strings
Starters 112 Divison 1 (Rated till 6 Stars)
Cursed Indices, 3 Logicians Walk into a Bar, Yet Another Array Game, Subtree Coloring, Permutation Construction
Starters 113 Division 1 (Rated)
Count Distinct Arrays, Maximise The Minimum, Minimise Maximum Subarray Sum, Make All Equal, Score Sum, Maximum Score
Starters 114 Division 1 (Rated till 6 Stars)
Yet another Matrix problem, Game on Array, Chef and Tag, Rock-Paper-Scissors, Lexicographic Rook on a Graph
Starters 115 Division 1 (Rated)
Greedy LIS Algorithm, Binary Grid Forces, Make All Zero
Starters 116 Divison 1 (Rated till 6-Stars)
Chef Product, ORST , Permutation Sort, Exact Savings
Starters 117 Division 1 (Rated till 5-Stars)
Equality Etiquette, Spread Spree, Stingy Arrays, Go Away, Goose!, Not Prime Permutation
Starters 118 Division 1 (Rated till 5-Stars)
Join States, Is it uniquely decodable, 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 , Count Subarrays, Count Arrays
Starters 121 Division 1 (Rated till 6-Stars)
Frequal, Split And Maximize, Escape, Caesar Cipher Lite
Starters 122 Division 1 (Rated till 6-Stars)
Arya In Grid, Transformation Cost, Matrix Modulo, Elf on the Shelf
Starters 123 Division 1 (Rated till 6-Stars)
Minimum And Maximum I, Yet Another Alice Bob Game, Minimum And Maximum II
Starters 124 Division 1 (Rated till 5-Stars)
Swap and Unite, Make It One
Starters 125 Division 1 (Rated till 6-Stars)
Bucket Game, Binary Minimal
Starters 126 Division 1 (Rated till 6 Stars)
Tree Distance Set, Freedom, LCD, Triangular Swaps
Starters127 Division 1
Array Operations, ABC Conjecture, Anti-Triangle
Starters 128 Division 1 (Rated till 6-Stars)
Binary Substring, XOR And Multiply
Starters 129 Division 1 (Rated till 5-Stars)
Palindromic Substrings, ConstructXor, Cake Cutting
Starters 130 Division 1 ( Rated till 6-Stars)
Updating A, Make Equal, Append Array, Good Binary String
Starters 131 Division 1 (Rated till 5 Stars)
K-Closeness, Digit Space, Encrypt Value, T-Perm
Starters 132 Division 1 (Rated till 6 Stars)
ALIEN-OR, Optimal Flip, MEX QUERIES , Prime Query
Starters 133 Division 1 (Rated till 6-Star)
ABC Conjecture 3, Powered Parameters, Too Far For Comfort (Easy Version)
Starters 134 Division 1 (Rated till 6-Stars)
Count Good RBS, Origin, Prison Escape, 3out1in
Starters 135 Division 1 (Rated till 5-Stars)
Milky-Dark Chocolates, Graph Cost, Limit of MEX, Change A to B
Starters 136 Division 1 ( Rated till 6-Stars )
Lexicographically Maximal Prefix AND, Sum of Modes
Starters 137 Division 1 (Rated till 5-Stars)
Speedrun, Double Trouble, Unusual Queries
Starters 138 Division 1 (Rated till 6-Stars)
A power B mod C , TRIPLE PRIMES, Prefix Suffix Inequality, Breezy Mode Problem, Distinct Substring
Starters 139 Division 1 (Rated till 5-Stars)
Sum of N, Destroying Bridges Part 2
Starters 140 Division 1 (Rated till 5-Stars)
Split Permutation, Trick Or Treat, Break The String, Tree Removal
Starters 141 Division 1 (Rated till 5-Stars)
Amphibian Escape, Perfect Prefixes
Starters 142 Division 1 (Rated till 5-Stars)
Sum of Xors, Array Removal, Number Hunt
Starters 143 Division 1 (Rated till 5-Stars)
Non-Divisor Array, Max Min and Length, Spread of Ratism
Starters 144 Division 1 (Rated)
Minimise Inversions, Largest K
Starters 145 Division 1 (Rated till 6-Stars)
Make Bob Win , Square String
Starters 146 Division 1 (Rated till 5 stars)
Bouncing Ball, Permutation Construction
Starters 147 Division 1 (Rated till 5 stars)
Truth Teller And Liars 101, Independence Day 101, Non-Primes 101, Gold Coins 101
Starters 148 Division 1 (Rated till 6 stars)
Double Trouble, Beautiful Flip, The Undisappearance, ZigZag Tree Sequences (Easy)
Starters 149 (Rated till 5 stars)
Kill Monsters (Hard Version), Maximise Sum, Chef Loves Beautiful Strings (Easy Version)
Starters 150 (Rated till 6 stars)
Equal Pairs (Hard), Min Ops (Hard), Replacing Game
Starters 151 (rated till 5 stars)
Ball Game, Sequence Search
Starters 152 (Rated till 6 stars)
Maximize Hamming Distance, Completion (Easy), Anti-Palindrome Queries
Starters 153 (Rated till 5 stars)
Another Game, Colorful Tree (Easy Version), Xometry (Easy Version), Xometry (Hard Version)
Starters 154 (Rated till 6 stars)
Tree Cut Xor, Count Winning Subarrays, GCD and XOR, Triangle Count (Hard), Triangle Count (Easy)
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, Interval Cliques, Partition Score
Starters 157 (Rated till 5 stars)
Small, Smaller, Smallest, Normal is Good, Unmedian
Starters 158 (Rated till 6 stars)
Make a Tree, Buying Game, Multiply 2 to Minimize
Starters 159 (Rated till 5 stars)
Crafty Coloring (Easy), Super Hero, Random Nim, Glass Bridge (Easy), Chess Colouring, Elections
Starters 160 (Rated till 5 stars)
Palindrome Love, Buying Order (Easy), Buying Order (Hard)
Starters 161 (Rated)
Min-Max Game, Red-Blue Sort, One To Three, Quick Exit
Starters 162 (Rated till 5 stars)
Empty the String, Permutation Mod K
Starters 163 (Rated till 5 stars)
Tree Sum is Fun !, Nice Array, Sort Them, Lexio Swap
Starters 164 (Rated till 5 stars)
Halloween Array, Construct Permutation, Connecting Wells
Starters 165 (Rated till 6 stars)
A to B, Stable Array
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)
Alternate Universe, Temperature Balance, Lottery Tickets, Grid Construction (Even), Grid Construction (Odd)
Starters 168 (Rated till 6 stars)
No Two Alike, Binary Removals, Equate XOR
Starters 169 (Rated till 5 stars)
Constant Subsequence, Hamming equivalent
Starters 170 (Rated till 6 star)
Array Compression, Crazy Jumping Frogs, qUiRkY qUesTs (Easy), Simultaneous Robots
Starters 171 (Rated till 5 star)
White Wall, Volcanic Eruption
Starters 172 (Rated till 5 stars)
Transform String, AndOr, Tactical Removal
Starters 173 (Rated upto < 2700)
Cool Subsequences, Introverts, Time Penalty, Overwrite
Starters 174 (Rated upto 2700)
GCD Add Size, Meximal Sum, Mystic Slimes
Starters 175 (Rated till 5 stars)
Alternate It!, Multiplexer
Starters 176 (Rated till 4 star)
Same And, Friendly Binary Strings, Costly Summit, Mex-P Tree (Easy)
Starters 177 (Rated till 5 star)
Flip or Reverse
Starters 178 (Rated till 6 star)
Smoothly Increasing , Big Difference, Minimum Colours (Hard)
Starters 179 (Rated till 5 star)
Product Path, Station Allocation, Can you reach
Starters 180 (Rated till 6 star)
Shall we play a game, Huh, Easy
Starters 181 (Rated for all)
The Best Matrix, Tree Colouring (Hard), Flip Prefix
Starters 182 (Rated till 5 star)
Palindromic Score
Starters 183 (Rated till 6 star)
Complete MST, S to T
Starters 184 (Rated till 5 star)
Second MEX, Adjacent OR, Front or Back, Double or Append
Starters 185 (Rated till 5 star)
GCD Summation, Asymmetric Cookies, Array Deletion Game
Starters 186 (Rated till 6 star)
Distinct Arrays , Segment Tree Reconstruction, Mod and Make Y
Starters 187 (Rated till 6 star)
Anti-Subarray Sum, OR What, Distinct Representations
Starters 188 (Rated till 6 star)
GCD and XOR 2 (Easy), Swaps in a String, K Boxes, Inversion Queries, Yet Another Monsters Problem
Starters 189 (Rated till 5 star)
Number Walks, Blocks in a String, Create Binary String, Avoid Primes, Sortable Subarrays (Easy)
Starters 190 (Rated till 5 star)
Subsequence Sort, Min-Max Deletion
Starters 191 (Rated till 6 star)
Add 1 or 2, Grid Path (Easy), Permuted Greater than 2