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(2025-11-19 22:00:00)Learning Paths (0)
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Contests (60)
Starters 73 Division 4 (Rated)
Minimum OR Path, Find an integer, Consecutive Xor, First To Last, Chef Plays Ludo, Multivitamin Tablets, Lucky Numbers, Append for OR
Starters 75 Division 2 (Rated)
Chefs Favourite Function, Minimum Replacement, Equal Hamming Distance, Prefix Ones, Three Powers of Two
January Long 2023 Division 2 (Unrated)
Asymmetric Swaps, Symmetric Swaps, Minimize the Maximum, Array Halves
February Cook-Off 2023 Division 1 (Rated)
Take Not Less, Alice Potter And Dumbledore Army
Starters 78 Division 1 (Rated till 6 stars)
MinAdd, Bitwise Equation, Balanced Suffix, Solve More Problems!
Starters 80 Division 1 (Rated till 5 stars)
Permutation Subsequence, c8kbf and Tree, Prefix Permutation, Eat Rock!
Starters 85 Division 1 (Rated till 6 stars)
Crazy Bishops on Chessboard, Efficient PAN Linking, GCD Queries, Bomb Blast, TripTastic
Starters 86 Division 1 (Rated for All)
Minimum Operation, String Game , Largest Y
Starters 87 Division 1 (Rated till 6 Stars)
Count the Permutations (always), Checkpoint, 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
Starters 89 Division 1 (Rated till 5 Stars)
Positive or Negative Subarrays, Subarray Removal, Two Averages, Evil Infection
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)
XOR & Sum, Odd GCD Permutation, Chef Odd, Maximum Sum Permutation
Starters 92 Division 1 (Rated till 6 Stars)
Rectangular Tiling, Dividing into Groups, A Peculiar Arrangement, Beautification of array, Distance Coloring
Starters 93 Division 1 (Rated for All)
Thank U, Next, NASA, Greedy, Motive
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, Remove Stones, Mex Array, Absolute Differences
Starters 97 Division 1 (Rated till 6 Stars)
Make It Special, No Palindrome, Triplets Min
Starters 98 Division 1 (Rated till 6 Stars)
3-Blast Palindrome, Happiness , Build Towers, Ball Distribution
Starters 99 Division 1 (Rated till 6 Stars)
Segment Three, Maximize Ones, Musical Chairs, Two Piles, Exclusion-Inclusion
Starters 100 Division 1 (Rated)
Prime Permutation, Stamps 100, Ant
Starters 101 Division 1 (Unrated)
Minimize Xor Difference, Split and ADD, Warrior Chef
Starters 102 Division 1 (Rated till 6 Stars)
Chess ELO, Parity Permutation, Light The Bulb, Chef Segment, Bit Play
Starters 103 Division 1 (Rated till 6 Stars)
Squarified, Chandelier, Unique xor, Divisible By 8
Starters 104 Division 1 (Rated till 6 Stars)
Lexicographically Largest , Construct An Array, Maximise Sum
Starters 105 Division 1 (Rated till 6 Stars)
Spooky Sequences, Dull Operation
Starters 106 Division 1 (Rated till 5 Stars)
Playing with OR, Save People, Guess the winner!, Count Possibilities, Smallest Excluded LCM, Reach Anywhere, Summing the values
Starters 107 Division 1 (Rated till 6 Stars)
Maximal Expression, Adjacent Flips, OR Permutation
Starters 108 Division 1 (Rated till 6 Stars)
Palindromic Prime Numbers, Fair Distribution, Continuous Subarrays, Multiple of 9
Starters 109 Division 1 (Rated till 5 Stars)
Minimum XOR, Chef Lost an Array, Alter Ego, Rigged Game
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, Prime Range Game, Beautiful Strings
Starters 114 Division 1 (Rated till 6 Stars)
Yet another Matrix problem, Rock-Paper-Scissors
Starters 115 Division 1 (Rated)
Greedy LIS Algorithm
Starters 117 Division 1 (Rated till 5-Stars)
Equality Etiquette, Spread Spree, Go Away, Goose!, Not Prime Permutation
Starters 118 Division 1 (Rated till 5-Stars)
Count Substrings, Join States, Is it uniquely decodable, Xorry 2, 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 , Minimum Operations, Construct Permutation, Count Subarrays, Count Arrays
Starters 122 Division 1 (Rated till 6-Stars)
Arya In Grid, Transformation Cost, Matrix Modulo
Starters 123 Division 1 (Rated till 6-Stars)
Minimum And Maximum I, Yet Another Alice Bob Game, Minimum And Maximum II
Starters127 Division 1
ABC Conjecture, Anti-Triangle
Starters 134 Division 1 (Rated till 6-Stars)
Origin, Prison Escape, 3out1in
Starters 135 Division 1 (Rated till 5-Stars)
Graph Cost, Change A to B
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)
Possible Contender, Amphibian Escape, Perfect Prefixes
Starters 142 Division 1 (Rated till 5-Stars)
Pairs Sum with Length x, Array Removal, Number Hunt
Starters 143 Division 1 (Rated till 5-Stars)
Non-Divisor Array, Max Min and Length
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)
K Subsequence 101, 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, RGB Grid (Easy), RGB Grid (Medium)
Starters 152 (Rated till 6 stars)
Completion (Hard), 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 (Easy)
Starters 155 (Rated till 5 stars)
GCD to 1 (Hard), Replace With First, Prefix Suffix Min Max, Array Concatanation
Starters 156 (Rated till 6 stars)
Expected Value Problem, Balance Difficulties, Interval Cliques, Partition Score
Starters 158 (Rated till 6 stars)
Make a Tree, Buying Game, Multiply 2 to Minimize
Starters 159 (Rated till 5 stars)
Crafty Coloring (Hard), Crafty Coloring (Easy), Glass Bridge (Hard), Super Hero, Random Nim, Glass Bridge (Easy), Chess Colouring, Elections
Starters 161 (Rated)
Red-Blue Sort, One To Three
Starters 162 (Rated till 5 stars)
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)
Fill the Blanks, Halloween Array, Construct Permutation
Starters 165 (Rated till 6 stars)
A to B, Stable Array, Reverse and Alternate (Count)
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, Sum Over Subarrays, Grid Construction (Even), Grid Construction (Odd)
Starters 172 (Rated till 5 stars)
Transform String, AndOr, Tactical Removal
Starters 173 (Rated upto < 2700)
Cool Subsequences, Time Penalty, Overwrite
Starters 175 (Rated till 5 stars)
Alternate It!, Multiplexer
Starters 178 (Rated till 6 star)
Smoothly Increasing
Starters 180 (Rated till 6 star)
Shall we play a game, Huh, Easy, Counting Problem
Starters 181 (Rated for all)
The Best Matrix, Tree Colouring (Hard), Flip Prefix
Starters 183 (Rated till 6 star)
Complete MST, S to T
Starters 187 (Rated till 6 star)
OR What, Distinct Representations
Starters 192 (Rated till 6 star)
Equate XY, No 3 Please!
Starters 194 (Rated for all)
Munchys Modulo, Good Arrays (Cyclic)
Starters 195 (Rated till 5 star)
String Deletions, Bugged Robot, Game (Easy), Game (Hard)
Starters 196 (Rated till 5 star)
Append Average
Starters 205 (Rated till 6 star)
Unreachable, Prefix-Suffix Reconstruction
Starters 207 (Rated till 5 star)
Adjacent Sums, Make Subarray, Maximum Smaller
Starters 208 (Rated till 6 star)
GCND, Cycle and Add
Starters 209 (Rated till 5 star)
Binary Love, Tactical Conversion
Starters 212 (Rated till 6 star)
Interesting Binary (Easy Version), Distinct Fun, Counting MEX Is Fun, Binary Flip
Starters 213 (Rated till 5 star)
Mean Difference (Easy), Chef and String, Separation, Maximum Product Walk
Starters 214 (Unrated)
Crazy Permutations, Scam, Delete For Fun