Sunaj
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Submissions Heat Map
Learning Paths (1)
Practice Paths (10)
Practice Java
1400 to 1600 difficulty problems
Medium Java puzzles
Dynamic programming
Binary Search
Greedy Algorithms
Number theory
Arrays, Strings & Sorting
Practice for ZCO and INOI
Rise from 3* to 4*
Contests (129)
July Challenge 2020 Division 2
Ada King, Missing a Point, Chef and Card Game
August Challenge 2020 Division 2
Chef Wars - Return of the Jedi, Another Card Game Problem, Chef and Linear Chess, Smallest KMP
September Challenge 2020 Division 2
A Problem on Sticks, Ada Matrix, Coronavirus Spread 2
July Cook-Off 2020 Division 2
Even-tual Reduction, OR-thodox Distinction
July Lunchtime 2020 Division 2
Chef and Steps, Maximum Candies
August Cook-Off 2020 Division 2
Polygon Relationship, K-Foldable String
August Lunchtime 2020 Division 2
Mode of Frequencies
June Cook-Off 2020 Division 2
Cache Hits
October Challenge 2020 Division 2
Positive AND, Replace for X, Covid Run, Chef and Easy Queries
November Challenge 2020 Division 2
Restore Sequence, Ada and Dishes
January Challenge 2021 Division 2
Fair Elections
December Challenge 2020 Division 2
Positive Prefixes, Even Pair Sum, Vaccine Production, Vaccine Distribution
October Cook-Off 2020 Division 2
Split the Str Ing, Decreasing Srrnmieeda, Path-etic Sums
November Cook-Off 2020 Division 2
Flip the String, Chef and IPC Certificates
September Cook-Off 2020 Division 2
Bowling Strategy
Code Ensemble (Rated for Division 2)
Priya and AND
February Challenge 2021 Division 3
Frog Sort, Chef and Meetings, Maximise Function, Highest Divisor
August Challenge 2021 Division 3 (Rated)
Chef and Bulb Invention, Problem Difficulties, Olympics Ranking
SnackDown 2021 - Online Qualifiers
Lucky Number
October Challenge 2021 Division 3 (Rated)
Longest AND Subarray, Digit Removal, MEX-OR, Three Boxes, Which Mixture
SnackDown 2021 - Online Round 1B
Queens Placement , Largest Laddu, Help Nishant
November Challenge 2021 Division 2 (Unrated)
Weird Palindrome Making, Hill Sequence, Equal Coins, Maximise the bridges
Code: Nium Challenge
Alphabet Difference, Divide Students Into Classes
CodeChef Starters 17 Division 2 (Rated)
Binary Inversion, GCD of Prefixes, New Piece
CodeChef Starters 19 Division 2 (Rated)
Indivisible Permutation
FizzBuzz Division 3 (Rated)
Magical Planks, Clean The Sequence, Substring Minimum Function, Can_Reach, Can You Eat It
December Challenge 2021 Division 2 (Unrated)
Increasing String , Check Mate, Valleys and Hills, Rock Paper Scissors, List of Lists, Utkarsh and Placement tests, Squares Counting
Infinity 2k21 Division 2 (Rated)
Marbles
January Long 2022 - I, Division 2 (Unrated)
Prime in a binary string
January Long 2022 - II, Division 2 (Unrated)
Power Sum, Crying Colours
February Long 2022 - II, Division 2 (Unrated)
Avoid Fixed Points, Xor Palindrome
March Long One 2022, Division 3 (Rated)
Akash and Function, Subarray XOR, Substring of a Substring, Akash and Missing Class, Exact Marks, Wordle
CodeChef Starters 29 Division 3 (Rated)
String protocol, Plusle and Minun on Array, Bomb the base
March Long Two 2022, Division 2 (Unrated)
Minimum Longest Substring, Same Parity Swaps in Binary Strings
March Cook-Off 2022 Division 2
Janmansh at Fruit Market, Equal Mex Splitting
CodeChef Starters 32 Division 2 (Rated)
Maximize the Minimum, Finding Shoes, Flip Sorting
April Cook-Off 2022 Division 2
Sticks and Rectangles
CodeChef Starters 33 Division 2 (Rated)
Distinct Dilemma, Broken Life, Non Adjacent Flips, Make Them Equal
Starters 35 Division 2 (Rated)
Dark Light, Admins and Shopping
Starters 37 Division 2 (Rated)
Beat the Average, Infernos, Maximum OR Minimum
May Long One 2022 Division 2 (Unrated)
Pushpa , Alternating Diameter, The Attack of Queen
Starters 38 Division 2 (Rated)
Average Gift, Anti-knapsack, Circular Track
May Lunchtime 2022 Division 2 (Rated)
Bucket and Water Flow , Maximum Pairwise Modular Sum, Equal After And
Starters 39 Division 2 (Rated)
Compress the Video, Crazy Substrings, Closest Vowels, Even Subarray XOR
May Long Two 2022 Division 2 (Unrated)
Xor Palindrome, Make them Zero
Starters 40 Division 2 (Unrated)
Infinity Staircase, Or Permutation, Good Pairs
Starters 41 Division 2 (Rated)
Equal Integers, Remove and Add, Is this priority or parity!, Path Parity
Starters 42 Division 2 (Rated)
Maximise Set Bits , Minimum or Maximum, Divisible by 3
June Long One 2022 Division 2 (Unrated)
Reduce to zero, Divisible by i , Possible GCD, Alternate Additions, Equal Strings
Starters 43 Division 2 (Rated)
Distinct Palindrome
June Long Two 2022 Division 2 (Unrated)
Count the ACs
Starters 45 Division 2 (Rated)
Even Equal Odd, Retrieve the Array, Adjacent Sum Parity
Starters 46 Division 2 (Rated)
Prime Xor, Vowel Anxiety, Array sorting, Sort the String
Starters 49 Division 2 (Rated)
Split The String, High Frequency, Monks, Valid Minimum
Starters 51 Division 2 (Rated)
Split N, Copy and Paste, Different Medians
Starters 52 Division 2 (Unrated)
Minimum Sum, WA Test Cases, K-Flip, Gritty Grid
Starters 53 Division 2 (Rated)
Black&White Ring Game, Make A and B equal, Queen Blocks
Starters 58 Division 2 (Unrated)
Break the elements, Equivalent Numbers, Add to Subsequence
Starters 59 Division 2 (Rated)
Maximum Subarray , Suspense String, Confusing Concatenations
October Long 2022 Division 2 (Unrated)
Binary Substituition, Single Operation Part 1, Single Operation Part 2
Starters 60 Division 2 (Rated)
Yet Another Palindrome Problem, Palindrome Flipping
Starters 61 Division 2 (Rated)
Palindrome Partition, Minimise LCS, Weird Subarrays, Subarray Removal
Starters 62 Division 2 (Rated)
Joint XOR, Sorted Substrings, Make Multiple, Final Sum
Starters 63 Division 2 (Rated)
One-XOR Deletions, Minimum Absolute Score
Starters 65 Division 2 (Rated)
Nahaane Jaa, Candies
Starters 67 Division 2 (Rated)
Maximum Angriness, Expensive Steps , Counting Problem
Starters 68 Division 2 (Rated)
Boring String, XOR Product, Expense List, Make Money
Starters 69 Division 2 (Rated)
Akash and Dinner, Distinct Sequence
Starters 70 Division 2 (Rated)
Minimum distance between 1s, Prime Reversal, Frequency Array Retrieval
Starters 71 Division 2 (Rated)
Pet Store, Flip the Prefix, Maximizing LCS
Starters 72 Division 2 (Rated)
N Triplets
Starters 73 Division 2 (Rated)
Find an integer, Consecutive Xor, Append for OR
Starters 75 Division 2 (Rated)
Prefix Ones, Three Powers of Two
Starters 76 Division 2 (Rated)
Make Array Odd, Zero String, Construct Array, Not Divisible
February Cook-Off 2023 Division 2 (Rated)
Take Not Less, Permutation and Modulus
Starters 78 Division 2 (Rated)
Bitwise Equation, Valid Expression
Starters 80 Division 2 (Rated)
Permutation Subsequence, Prefix Permutation, Equal Elements
Starters 82 Division 2 (Rated)
Find eX, Make A-B Same, Difference Matrix, MIN To MAX
Starters 84 Division 2 (Rated)
Max count of 1, Digit Operation, Max Binary, Chef And Adjacent Sums
Starters 85 Division 2 (Rated)
Crazy Bishops on Chessboard, Efficient PAN Linking, Inside The Stadium
Starters 86 Division 2 (Rated)
String Game , Largest Y, Maximise Score
Starters 87 Division 2 (Rated)
Existence, AB plus C
Starters 83 Division 2 (Rated)
Construct String
Starters 89 Division 2 (Rated)
Plus 2 or Minus 1, Positive or Negative Subarrays
Starters 90 Division 2 (Rated)
Crushed Apples and a Balance Scale, Printing Binary Array, Anti Palindrome
Starters 91 Division 2 (Rated)
Odd GCD Permutation, Chef Odd, Blobby Volley Scores
Starters 92 Division 2 (Rated)
Rectangular Tiling, Distance Coloring, Dotify Playlist
Starters 93 Division 2 (Rated)
Break Free, Problem
Starters 94 Division 2 (Rated)
CodeChef Streak, Possible or Not
Starters 95 Division 2 (Rated)
Boxes, Transfusion Chain, EVacuate to Moon
Starters 100 Division 2 (Rated)
Stamps 100
Starters 101 Division 2 (Rated)
Warrior Chef, Lockpicking Chef
Starters 102 Division 2 (Rated)
Bit Play
Starters 104 Division 3 (Rated)
Maximise Sum, Santa and Chocolates, Pizza Cutting, GCD and LCM
Starters 106 Division 2 (Rated)
Playing with OR, Save People
Starters 107 Division 3 (Rated)
Rock Paper Scissor, Pending Assignments, OR Permutation
Starters 108 Division 3 (Rated)
Fair Distribution, Chess Pairing
Starters 109 Division 3 (Rated)
Minimum XOR, Best of N Sets, Worth of a Video, Alter Ego
SQL Contest (Unrated)
First Problem on SQL
Starters 111 Divison 3 (Rated)
Prefixing, Beautiful Strings, Reach Codetown, Exams
Starters 112 Division 2 (Rated)
Cursed Indices, 3 Logicians Walk into a Bar, Permutation Construction, Max Nutrition
Starters 113 Division 2 (Rated)
Minimise Maximum Subarray Sum, Make All Equal, Maximum Score , Sum Neq
Starters 114 Division 2 (Rated)
Game on Array, Rock-Paper-Scissors, Christmas Candy
Starters 115 Division 2 (Rated)
Greedy LIS Algorithm, A PLUS B Remastered, Decorating Christmas Tree
Starters 116 Division 2 (Rated)
ORST , Access Control
Starters 117 Division 2 (Rated)
Not Prime Permutation, Spell Shortening
Starters 124 Division 2 (Rated)
Binary Parity, Table Strength, Make It One
Starters 125 Division 2 (Rated)
Bucket Game, Fake Certificate, Binary Minimal
Starters 127 Division 2
ABC Conjecture, Superincreasing, Anti-Triangle
Starters 128 Division 2 (Rated)
Binary Substring, MEXimize the Array, Disjoint Non-Decreasing Array
Starters 129 Division 2 (Rated)
Palindromic Substrings, Ballon d Or
Starters 130 Division 2 (Rated)
Make Equal, Alternating Binary String, Good Binary String
Starters 131 Division 2 (Rated)
K-Closeness, Dice Deception, Encrypt Value
Starters 132 Division 2 (Rated)
ALIEN-OR, Optimal Flip, GAME 11
Starters 133 Division 2 (Rated)
Powered Parameters, Maximum Alternating Sum
Starters 134 Division 2 (Rated)
Origin, Rock Paper Scissors
Starters 135 Division 2 (Rated)
Invert And Equalize
Starters 136 Division 2 ( Rated )
Sum of Modes, My First Geometry Problem
Starters 137 Division 2 (Rated)
Large Differences
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
Starters 141 Division 2 (Rated)
Redundant Array, Amphibian Escape
Starters 142 Division 2 (Rated)
Chef loves Pizza Chef loves halfs, Array Removal, Number Hunt
Starters 143 Division 2 (Rated)
Binary Conversion
Starters 144 Division 2 (Rated)
Budget Allotment, Largest K
Starters 147 Division 2 (Rated till 5 stars)
Truth Teller And Liars 101, Independence Day 101, Non-Primes 101, Gold Coins 101
Starters 148 Division 2 (Rated)
FightBots
Starters 149 (Rated)
Easy Subarray Sum, Maximise Sum
Starters 150 (Rated)
Equal Pairs (Hard), Find Multiset State, Equal Pairs (Easy)
Starters 154 (Rated)
GCD and XOR, Add 1 or 2 Game
Starters 157 (Rated)
Small, Smaller, Smallest, Unmedian, Not-too-far Replacement
Starters 160 (Rated)
Palindrome Love, Buying Order (Easy), Equate S and T
Starters 161 (Rated)
Two Cards
Starters 163 (Rated)
Minimum Types
Starters 164 (Rated)
Halloween Array, Swap and Flip
Starters 165 (Rated)
Reverse and Alternate, Stable Array, Bulk Discount
Starters 168 (Rated)
No Two Alike, Binary Removals, Make Odd
Starters 169 (Rated)
Hamming equivalent, Make K Most Frequent
Starters 170 (Rated)
Crazy Jumping Frogs, qUiRkY qUesTs (Easy), Monster Monster
Starters 171 (Rated)
Swish Game, White Wall, Volcanic Eruption
Starters 173 (Rated upto < 2700)
Cool Subsequences, Time Penalty
Starters 174 (Rated)
Deletion and Difference
Starters 175 (Rated)
Alternate It!, Technex Tickets, Make same
Starters 178 (Rated)
Big Difference, Placing 01 And 10, Permutation Construct