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- 7★flytime
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Ratings System Update
(2025-02-19 22:15:00)Ratings System Update
(2022-12-20 00:00:00)Learning Paths (0)
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Contests (14)
Starters 63 Division 4 (Rated)
Distinct Neighbours , Maximize 1s, Count Partitions , GCD Sort, One-XOR Deletions, Packing Books, Make Length 1, Minimum Absolute Score, Tasty Decisions, Greedy Grid Moves, Avoid Squares Please
Starters 64 Division 2 (Rated)
Mario and the Broken String, Luigi and Uniformity, Range Assign, Number of Distinct Elements Minimize, Square Sort, Xor Array, Prime Factor Division, Distinct Neighbours , Distinct Colors, Water Consumption
Starters 65 Division 1 (Rated for 5 & 6 stars)
Nahaane Jaa, Paisa Double, Parity, Candies, Binod, Gormint Aunty, Hackerman, Potato to Gold, Lazy Ancestors
November Long 2022 Division 1 (Unrated)
MaxEdges, Minimize swaps, Split and Maximize, Spliting Balls, Alice and the Array, Time Complexity, Water Mixing, String Game
Starters 66 Division 1 (Rated till 5-stars)
Sorting the Binary String, Good Binary Strings, Palindrome by Splitting, Connect All Cities, Palindrome In Making, Chef and Spice Grid, Just Like Mob!, Binary Battles, Squats, Minimum value of special tables, Monopoly in Chefland
Starters 67 Division 1 (Rated till 5-stars)
Interactive Tree, Maximum Angriness, Musical Rods, Expensive Steps , Minimum Number of Ones, Counting Problem, Tour of King, Existence Of X
Starters 68 Division 1 (Rated till 5-stars)
Guess All, Boring String, Restore the Permutation, XOR Product, Expense List, Interesting Array, Bull or Bear, Make AP, Make Money
Starters 69 Division 1 (Rated till 6-stars)
Akash and Dinner, Rain in Chefland, Adjacent Pair Swaps, Make everything divisible by 3, Passing Through!, Scalene Triangle, Convert to permutation, Distinct Sequence, Longest Subarray, Sort Permutation
Starters 70 Division 1 (Rated till 6-stars)
Kitchen Timings, Spice Level, Cost of Groceries, Minimum distance between 1s, Strange Bitwise Operation, X AND Y Tree, Two Counters, Prime Reversal, Frequency Array Retrieval
Starters 71 Division 1 (Unrated)
Pet Store, Flip the Prefix, Unique Mode, Instagram, Snapchat, Expected Sum, Perfect Trio, Maximizing LCS, Smallest Difference
December Long 2022 Division 1 (Unrated)
Counting Subsequences, Not Divisible, Break into Powers, Sum of Cube , Divisible by A_i, Gcd of Subarrays, Good Investment or Not, Divisible by K, Reach fast, Maximise XOR
Starters 72 Division 1 (Rated till 5-Stars)
Indivisible, Apples and oranges, N Triplets, Good Sequence, Sum it, No sequence, Base or Bias, XOR Tree
Starters 73 Division 1 (Rated till 6-Stars)
Minimum OR Path, Find an integer, Consecutive Xor, First To Last, Chef Plays Ludo, Multivitamin Tablets, Hamiltonian Tree, Lucky Numbers, Append for OR, Elevators
Starters 74 Division 1 (Rated till 6-Stars)
Facebook, Candies, Maximum Xor Sum, Mana Points, Distinct Values, Chef And Babla, Lcm hates Gcd, Minimal Inversions, Odd Even Binary String
Starters 75 Division 1 (Rated till 6-Stars)
Chefs Favourite Function, Minimum Replacement, Equal Hamming Distance, Prefix Ones, Three Powers of Two, Two Ranges, Saving Taxes, Profit Increment
January Long 2023 Division 1 (Unrated)
A Short Counting Problem, Asymmetric Swaps, Swap Shift, Maximum of GCDs, Symmetric Swaps, Minimize the Maximum, Array Halves, Far from origin, Overspeeding Fine, Negative Product
Starters 76 Division 1 (Rated till 5-Stars)
Redistributing Chocolates, Read Pages, Bitwise Operations on Circle, Make Array Odd, Zero String, Expected Value, Construct Array, 400M Race, Not Divisible
February Cook-Off 2023 Division 1 (Rated)
Battery Health, Take Not Less, Alice Potter and OWL, Alice Potter And Dumbledore Army, Bi_lindrome!, Permutation and Modulus, Netflix
Starters 77 Division 1 (Rated till 5 Stars)
Yet Another XOR Sort, Sort a String, K Forests, Spreading Charges, Tekken, Tom and Jerry Chase, Codechef Airlines, Concat Palindrome, K Increment Palindrome, Three Numbers
Starters 78 Division 1 (Rated till 6 stars)
Yet Another XOR Sort 2, MinAdd, Bitwise Equation, Balanced Suffix, Valid Expression, Passing Marks, Candy Store, Good Turn, Divisible Subarray Counting
Starters 79 Division 1 (Rated till 5 Stars)
Love Squares Hate Cubes, K-Beautiful Subarrays, Mountain, One Stone or Two Stones, Split or Decrease, Add smallest prime factor, Distinct Opposite Sums, Better Deal, Ageing
Starters 80 Division 1 (Rated till 5 stars)
Permutation Subsequence, Three-People Contests, c8kbf and Tree, Prefix Permutation, Eat Rock!, Matrix Pain, Just One More Episode, Single-use Attack, Running Comparison, Equal Elements
Starters 82 Division 1 (Rated till 6 stars)
Mode!, Tree Game, Make Them Alike, Find eX, Make A-B Same, Difference Matrix, MIN To MAX, Candy Division
Starters 85 Division 1 (Rated till 6 stars)
Crazy Bishops on Chessboard, Efficient PAN Linking, Inside The Stadium, Tree Xor, IPL Ticket Rush, Can Chef , GCD Queries, Bomb Blast, TripTastic
Starters 83 Division 1 (Rated)
Chef Eren, Construct String, Budget of Technex, Order by XOR, Saber Slays, Couple Game
Starters 89 Division 1 (Rated till 5 Stars)
Monopoly, Plus 2 or Minus 1, Positive or Negative Subarrays, Subarray Removal, Two Averages, Parliament, DDMM or MMDD
Starters 90 Division 1 (Rated till 6 Stars)
Crushed Apples and a Balance Scale, Sum of Goodness, Finding Sum, Learning SQL, AP Free Sequences, Printing Binary Array, Favourite Numbers, Anti Palindrome
Starters 91 Division 1 (Rated till 6 Stars)
Cheapest Office, Odd GCD Permutation, More Inversions, Chef Odd, Blobby Volley Scores, Bus Seat Numbering, Parking Charges, Maximum Sum Permutation
Starters 92 Division 1 (Rated till 6 Stars)
Rectangular Tiling, Dividing into Groups, A Peculiar Arrangement, Chef and Polygons, Beautification of array, Distance Coloring, Dotify Playlist, Water Filling, Oneful Pairs
Starters 93 Division 1 (Rated for All)
Break Free, Thank U, Next, Why Try, NASA, Greedy, Bloodline, Motive, Right There, 7 Rings, Problem
Starters 94 Division 1 (Rated till 5 Stars)
The Gift, Gymkhana Election IIIT-A, Strange Sort, Place The Number, CodeChef Streak, Possible or Not, Search for 404, Special Operation, The Vowel Matrix, Rank Queries
Starters 95 Division 1 (Rated till 6 Stars)
Alt-Tab, Chef and Moves of GCD, Boxes, Donation Drive, Donation Rewards, Transfusion Chain, EVacuate to Moon, Break This Array
Starters 96 Division 1 (Rated till 5 Stars)
Swap the numbers, Remove Stones, Zero Array, Mex Array, Remove Multiples, Absolute Differences, Bells of Pilgrimage, Weeding, AB Difference
Starters 97 Division 1 (Rated till 6 Stars)
Make It Special, Caesar Cipher, Unreachability Cost, Schrodinger Smiley, Triplets Min, 2000, Best of Two
Starters 98 Division 1 (Rated till 6 Stars)
Messi vs Ronaldo, 3-Blast Palindrome, Happiness , FIND A and B, Airport Management, Build Towers, Ball Distribution, Sub-Array With Maximum Sum
Starters 99 Division 1 (Rated till 6 Stars)
Segment Three, Maximize Ones, Musical Chairs, Two Piles, Yet Another Bitwise Problem, Card Swipe, Endless Appetizers, Puzzle Hunt, Exclusion-Inclusion
Starters 101 Division 1 (Unrated)
Minimize Xor Difference, Split and ADD, Snakes on a Grid, Partially Increasing Array Queries, Warrior Chef, Work Smarter, Not Harder, Lockpicking Chef, Off By One
Starters 102 Division 1 (Rated till 6 Stars)
Chess ELO, Parity Permutation, Light The Bulb, Chef Segment, Bit Play, Array Sum, Sports Section, Selling Insurance, Chef and Stocks
Starters 103 Division 1 (Rated till 6 Stars)
Cost Distribution, Squarified, X-Ray Grid, Chandelier, Unique xor, Sunday Brunch, October Marathon, Divisible By 8, Dice Number
Starters 104 Division 1 (Rated till 6 Stars)
Find Diameter, Lexicographically Largest , Construct An Array, Maximise Sum, Santa and Chocolates, Pizza Cutting, Double Rent, GCD and LCM
Starters 105 Division 1 (Rated till 6 Stars)
Ghoul-icious Goodies, Racing Dead, Spooky Sequences, Dull Operation, Wishcraft
Starters 106 Division 1 (Rated till 5 Stars)
Fan Poll, Chef Fantasy 11, Playing with OR, Save People, Guess the winner!, Count Possibilities, Smallest Excluded LCM, Reach Anywhere, Summing the values, Is it Obvious, Survival Time
Starters 107 Division 1 (Rated till 6 Stars)
Maximal Expression, Interesting Knapsack, Adjacent Flips, Odd Matrix, Rock Paper Scissor, Pending Assignments, Clear Day, OR Permutation, Recover The Array
Starters 108 Division 1 (Rated till 6 Stars)
Clan Expansion, Palindromic Prime Numbers, Rivalry, Fair Distribution, Chess Pairing, Continuous Subarrays, Gold Rush, Multiple of 9, Move Negative Stones
Starters 109 Division 1 (Rated till 5 Stars)
Minimum XOR, Cricket World Cup Qualifier, Best of N Sets, Chef Lost an Array, Worth of a Video, Alter Ego, Rigged Game
August Long 2023 Division 1 (Unrated)
All New CodeChef, Maximum Deliciousness, I Can Use Both Hands!
September Short 2023 Division 1 (Unrated)
GCD Discount, Ultimate Fencing, Lucky Seven, Slow Start, Mixing Extraordinaire
Starters 110 Division 1 (Rated till 5-stars)
Water Park, Airlines, 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, ODI Cricket, Component Count, Square Count, Reach Codetown, Exams, 404 Not Found
Starters 112 Divison 1 (Rated till 6 Stars)
Cursed Indices, Food Costs, Fair Share Settlement, 3 Logicians Walk into a Bar, Yet Another Array Game, Subtree Coloring, Permutation Construction, Max Nutrition
Starters 113 Division 1 (Rated)
Count Distinct Arrays, Maximise The Minimum, Minimise Maximum Subarray Sum, Make All Equal, Score Sum, Maximum Score , Sum Neq , Make N Zero, Thala For A Reason
Starters 114 Division 1 (Rated till 6 Stars)
Chef and Tag, Rock-Paper-Scissors, Lexicographic Rook on a Graph
Starters 115 Division 1 (Rated)
Delete The Array, Subtraction Sequence I, Subtraction Sequence II, Greedy LIS Algorithm, Binary Grid Forces, Make All Zero, A PLUS B Remastered, Decorating Christmas Tree, Chocolate Distribution, Codechef Round
Starters 116 Divison 1 (Rated till 6-Stars)
Chef Product, Hattrick, ORST , Permutation Sort, Minimum Wage, Exact Savings, Access Control
Starters 117 Division 1 (Rated till 5-Stars)
Equality Etiquette, Spread Spree, Stingy Arrays, Go Away, Goose!, Not Prime Permutation, Roads and Flights, Weapon Choice, Spell Shortening, Yearly Phone
Starters 118 Division 1 (Rated till 5-Stars)
Subset GCD, Count Substrings, Literacy Rate, International Education Day!, Join States, Is it uniquely decodable, Xorry 2, Xorry 1
Starters 119 Division 1 (Rated till 6-Stars)
Advitiya, Judged, Cookie Day, Another Good String , K Odd Sum, Xorred, Unalike Gcd & Lcm
Starters 120 Division 1 (Rated till 6 Stars)
Find Permutation , Construct Permutation, Count Subarrays, Count Arrays, Largest K, Valentines Contest, Sub or Swp, Valentine Gifts
Starters 121 Division 1 (Rated till 6-Stars)
Frequal, Colourful Balls, Split And Maximize, Escape, Caesar Cipher Lite, Leg Space, Anti Adjacent Swaps, The Man Code
Starters 122 Division 1 (Rated till 6-Stars)
Healthy Sleep, Problem Reviews, Arya In Grid, Transformation Cost, Matrix Modulo, Elf on the Shelf, Man of the Match
Starters 123 Division 1 (Rated till 6-Stars)
Room Allocation, Algomaniac Finals, Maximise Adjacent Sum, Check Adjacent Sum, Minimum And Maximum I, Making Stars, Yet Another Alice Bob Game, Trial of the Conqueror, Minimum And Maximum II
Starters 124 Division 1 (Rated till 5-Stars)
Binary Parity, Table Strength, Swap and Unite, Make It One, Summer Time, Cricket Tournament, How many arrays, It is a tree
Starters 125 Division 1 (Rated till 6-Stars)
Bucket Game, Manhattan Xor, Operating on A, Overspeeding, 50-50 Rule, Fake Certificate, Binary Minimal
Starters 126 Division 1 (Rated till 6 Stars)
Tree Distance Set, AC Please, Dice Game 3, Freedom, Sale, Uncommon Cycles, LCD, Permutation Disturbance, Triangular Swaps
Starters127 Division 1
Array Operations, Expected Components, Purify It, ABC Conjecture, The Ides of March, Superincreasing, Extreme Basketball, Anti-Triangle
Starters 129 Division 1 (Rated till 5-Stars)
Palindromic Substrings, Red Blue Decomposition, Football Training, Pep Bidding, Ballon d Or, ConstructXor, SumXor, Cake Cutting
Starters 130 Division 1 ( Rated till 6-Stars)
Updating A, Make Equal, Costly Swapping, Append Array, Good Binary String
Starters 131 Division 1 (Rated till 5 Stars)
Remaining Neighborhoods, K-Closeness, Digit Space, Gotta Catch Em All, Dice Deception, Encrypt Value, T-Perm
Starters 132 Division 1 (Rated till 6 Stars)
ALIEN-OR, Optimal Flip, Change Please, ICE CREAM, Goodness Over Good, MEX QUERIES , Prime Query, GAME 11
Starters 133 Division 1 (Rated till 6-Star)
ABC Conjecture 3, Powered Parameters, Too Far For Comfort, Too Far For Comfort (Easy Version)
Starters 134 Division 1 (Rated till 6-Stars)
Count Good RBS, Permutation Cycle Queries, Origin, Morning Run, Prison Escape, Money Double, Rock Paper Scissors, 3out1in
Starters 135 Division 1 (Rated till 5-Stars)
Graph Cost, Invert And Equalize, Limit of MEX, Change A to B, Football Ties, RCB vs CSK
Starters 136 Division 1 ( Rated till 6-Stars )
Lexicographically Maximal Prefix AND, Sum of Max K Subarray, Sum of Modes, Who Makes P1, Even Sum Subarray
Starters 137 Division 1 (Rated till 5-Stars)
Coprime Subarrays, Speedrun, Concat Lexmax Substrs, Double Trouble, Unusual Queries, Election Hopes, Spell Splice, Large Differences
Starters 138 Division 1 (Rated till 6-Stars)
A power B mod C , TRIPLE PRIMES, K Subarray Products, Prefix Suffix Inequality, Breezy Mode Problem, Heat Wave, Long Drive, Distinct Substring
Starters 139 Division 1 (Rated till 5-Stars)
Sort Perm, Sum of N, Maximum Distance Permutations, Counting in Base B, Skill Game, Distribute Cookies, Destroying Bridges Part 2, Television Channels
Starters 140 Division 1 (Rated till 5-Stars)
Make Permutation, Split Permutation, Trick Or Treat, Yoga Day, Break The String, Yoga Class, Tree Removal
Starters 143 Division 1 (Rated till 5-Stars)
Non-Divisor Array, Max Min and Length, Spread of Ratism
Starters 144 Division 1 (Rated)
Sort Lexicographically , Find P, Minimise Inversions, Largest K
Starters 145 Division 1 (Rated till 6-Stars)
Beautiful Array, Make Bob Win , Volume Comparison, Querified, Gun Master, Make My Array Equal, Square String
Starters 146 Division 1 (Rated till 5 stars)
Back Front, Connect The Chains, Bouncing Ball, Permutation Construction, Binary Strings Yet Again, Knockout tournament, No Winner, Olympics 2024
Starters 147 Division 1 (Rated till 5 stars)
Counting Triangles 101, K Subsequence 101, Counting is Fun 101, Truth Teller And Liars 101, Independence Day 101, Non-Primes 101, Gold Coins 101
Starters 148 Division 1 (Rated till 6 stars)
Xor Minimization (Easy), Double Trouble, Beautiful Flip, Let Me Eat Cake!, Clearance Sale, The Undisappearance, FightBots, ZigZag Tree Sequences (Easy)
Starters 149 (Rated till 5 stars)
Kill Monsters (Hard Version), Magical World, Easy Subarray Sum, Maximise Sum, Chef Loves Beautiful Strings (Hard Version), Approximate Answer, Chef Loves Beautiful Strings (Easy Version), Kill Monsters (Easy Version)
Starters 150 (Rated till 6 stars)
Equal Pairs (Hard), Min Ops (Easy), Min Ops (Hard), Tree Requirements (Easy), Not Equal On Tree, Replacing Game, Find Multiset State, IOI 2024, Ratio By 2
Starters 151 (rated till 5 stars)
Ball Game, Shooting (Hard), Sequence Search, Convert string, Shooting (Easy), International Gym Day, RGB Grid (Easy), RGB Grid (Medium), Weightlifting
Starters 152 (Rated till 6 stars)
Completion (Hard), Maximize Hamming Distance, Chess Olympiad, Winning World Finals, Completion (Easy), Anti-Palindrome Queries, Range Minimize
Starters 153 (Rated till 5 stars)
AI is Coming, Make Arithmetic Progression, Butterfly, Another Game, Colorful Tree (Easy Version), Colorful Tree (Hard Version), Xometry (Easy Version), Xometry (Hard Version)
Starters 156 (Rated till 6 stars)
Count Triplets, Keep Magnets Separated, Balance Difficulties, Interval Cliques, Partition Score, Sweets Shop, Long Queue, Even Numbers Hate
Starters 158 (Rated till 6 stars)
Make a Tree, Global Warming, Largest Subsequence, XOR Smaller, Buying Game, Multiply 2 to Minimize, Diwali Discount, Even vs Odd Divisors
Starters 159 (Rated till 5 stars)
Crafty Coloring (Hard), Crafty Coloring (Easy), Icecream and Cone, Glass Bridge (Hard), Super Hero, Random Nim, Glass Bridge (Easy), Chess Colouring, Elections, Card Game
Starters 160 (Rated till 5 stars)
Too Many Oranges, Movie Snacks, Palindrome Love, Modindrome, Unstable Elections, Buying Order (Easy), Buying Order (Hard), Equate S and T
Starters 161 (Rated)
Min-Max Game, Temporary Temperature, Red-Blue Sort, Moneymaking, Selling Donuts, One To Three, Two Cards, Quick Exit
Starters 163 (Rated till 5 stars)
Tree Sum is Fun !, Nice Array, Permutation Pair, Chef and Socks, Binary Sum, Minimum Types, Sort Them, Lexio Swap
Starters 164 (Rated till 5 stars)
Assignment of Tasks, New-Pro Coder, Itz Simple, Fill the Blanks, Halloween Array, Construct Permutation, Swap and Flip, Connecting Wells
Starters 165 (Rated till 6 stars)
Christmas Cake, Reverse and Alternate, Poster Perimeter, A to B, Stable Array, Reverse and Alternate (Count), Bulk Discount
Starters 166 (Rated till 6 stars)
All Equal, Distinct Power, Divisors Array (Hard Version), Divisors Array (Easy Version), Costly Permutations, Chefland Library, Christmas Gifts, Merry Christmas!
Starters 168 (Rated till 6 stars)
GCD Partition, No Two Alike, Can You Bench, Binary Removals, Xoperations, Equate XOR, Make Odd, Big Achiever
Starters 169 (Rated till 5 stars)
Constant Subsequence, Hamming equivalent, Make K Most Frequent, Opposite Attract, Entry Check
Starters 170 (Rated till 6 star)
Crazy Jumping Frogs, Access Code Equality, qUiRkY qUesTs (Easy), Monster Monster, Minimum Bottles
Starters 171 (Rated till 5 star)
Squid Game - Piggy Bank, Swish Game, Advitiya Security Vault, Strange Nim Game, White Wall, Advitiya, Volcanic Eruption
Starters 172 (Rated till 5 stars)
Transform String, Time Machine, AndOr, Small Palindrome, Streak Star, Tactical Removal
Starters 173 (Rated upto < 2700)
Cool Subsequences, Postman and LLM, Introverts, Min-Max Product Partition, Time Penalty, Overwrite
Starters 174 (Rated upto 2700)
GCD Add Size, Meximal Sum, Mystic Slimes, Too Much Homework!, Bigger is Better, Deletion and Difference