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Solutions to HackerRank problems

HackerRank

Solutions to HackerRank problems

  • Algorithms
  • Data Structures
  • Python
  • Linux Shell
  • CPP
  • C
  • Interview Preparation Kit

Algorithms

Subdomain Difficulty Challenge Solution
Warmup Easy Solve Me First solve-me-first.py
Warmup Easy Simple Array Sum simple-array-sum.py
Warmup Easy Compare the Triplets compare-the-triplets.py
Warmup Easy A Very Big Sum a-very-big-sum.py
Warmup Easy Diagonal Difference diagonal-difference.py
Warmup Easy Plus Minus plus-minus.py
Warmup Easy Staircase staircase.py
Warmup Easy Mini-Max Sum mini-max-sum.py
Warmup Easy Birthday Cake Candles birthday-cake-candles.py
Warmup Easy Time Conversion time-conversion.py
Implementation Easy Grading Students grading.py
Implementation Easy Apple and Orange apple-and-orange.py
Implementation Easy Kangaroo kangaroo.py
Implementation Easy Between Two Sets between-two-sets.py
Implementation Easy Breaking the Records breaking-best-and-worst-records.py
Implementation Easy Birthday Chocolate the-birthday-bar.py
Implementation Easy Divisible Sum Pairs divisible-sum-pairs.py
Implementation Easy Migratory Birds migratory-birds.py
Implementation Easy Day of the Programmer day-of-the-programmer.py
Implementation Easy Bon Appétit bon-appetit.py
Implementation Easy Sock Merchant sock-merchant.py
Implementation Easy Drawing Book drawing-book.py
Implementation Easy Counting Valleys counting-valleys.py
Implementation Easy Electronics Shop electronics-shop.py
Implementation Easy Cats and a Mouse cats-and-a-mouse.py
Implementation Easy Picking Numbers picking-numbers.py
Implementation Easy The Hurdle Race the-hurdle-race.py
Implementation Easy Designer PDF Viewer designer-pdf-viewer.py
Implementation Easy Utopian Tree utopian-tree.py
Implementation Easy Angry Professor angry-professor.py
Implementation Easy Beautiful Days at the Movies beautiful-days-at-the-movies.py
Implementation Easy Viral Advertising strange-advertising.py
Implementation Easy Save the Prisoner! save-the-prisoner.py
Implementation Easy Circular Array Rotation circular-array-rotation.py
Implementation Easy Sequence Equation permutation-equation.py
Implementation Easy Jumping on the Clouds: Revisited jumping-on-the-clouds-revisited.py
Implementation Easy Find Digits find-digits.py
Implementation Easy Append and Delete append-and-delete.py
Implementation Easy Sherlock and Squares sherlock-and-squares.py
Implementation Easy Library Fine library-fine.py
Implementation Easy Cut the sticks cut-the-sticks.py
Implementation Easy Repeated String repeated-string.py
Implementation Easy Jumping on the Clouds jumping-on-the-clouds.py
Implementation Easy Equalize the Array equality-in-a-array.py
Implementation Easy ACM ICPC Team acm-icpc-team.py
Implementation Easy Taum and B'day taum-and-bday.py
Implementation Easy Modified Kaprekar Numbers kaprekar-numbers.py
Implementation Easy Beautiful Triplets beautiful-triplets.py
Implementation Easy Minimum Distances minimum-distances.py
Implementation Easy Chocolate Feast chocolate-feast.py
Implementation Easy Service Lane service-lane.py
Implementation Easy Lisa's Workbook lisa-workbook.py
Implementation Easy Flatland Space Stations flatland-space-stations.py
Implementation Easy Fair Rations fair-rations.py
Implementation Easy Cavity Map cavity-map.py
Implementation Easy Manasa and Stones manasa-and-stones.py
Implementation Easy Happy Ladybugs happy-ladybugs.py
Implementation Easy Strange Counter strange-code.py
Implementation Easy Halloween Sale halloween-sale.py
Implementation Medium Forming a Magic Square magic-square-forming.py
Implementation Medium Climbing the Leaderboard climbing-the-leaderboard.py
Implementation Medium Extra Long Factorials extra-long-factorials.py
Implementation Medium Non-Divisible Subset non-divisible-subset.py
Implementation Medium Queen's Attack II queens-attack-2.py
Implementation Medium Encryption encryption.py
Implementation Medium Bigger is Greater bigger-is-greater.py
Implementation Medium The Time in Words the-time-in-words.py
Implementation Medium The Grid Search the-grid-search.py
Implementation Medium 3D Surface Area 3d-surface-area.py
Implementation Medium Absolute Permutation absolute-permutation.py
Implementation Medium Ema's Supercomputer two-pluses.py
Implementation Medium Larry's Array larrys-array.py
Implementation Medium Almost Sorted almost-sorted.py
Sorting Easy Big Sorting big-sorting.py
Strings Easy Super Reduced String reduced-string.py
Strings Easy CamelCase camelcase.py
Strings Easy Two Characters two-characters.py
Strings Easy Caesar Cipher caesar-cipher-1.py
Strings Easy Mars Exploration mars-exploration.py
Strings Easy HackerRank in a String! hackerrank-in-a-string.py
Strings Easy Pangrams pangrams.py
Strings Easy Weighted Uniform Strings weighted-uniform-string.py
Strings Easy Separate the Numbers separate-the-numbers.py
Strings Easy Funny String funny-string.py
Strings Easy Gemstones gem-stones.py
Strings Easy Alternating Characters alternating-characters.py
Strings Easy Beautiful Binary String beautiful-binary-string.py
Strings Easy The Love-Letter Mystery the-love-letter-mystery.py
Strings Easy Palindrome Index palindrome-index.py
Strings Easy Anagram anagram.py
Strings Easy Making Anagrams making-anagrams.py
Strings Easy Game of Thrones - I game-of-thrones.py
Strings Easy Two Strings two-strings.py
Strings Easy String Construction string-construction.py
Strings Easy Strong Password strong-password.py
Strings Medium Sherlock and Anagrams sherlock-and-anagrams.py
Strings Medium Sherlock and the Valid String sherlock-and-valid-string.py
Strings Medium Common Child common-child.py
Sorting Easy Intro to Tutorial Challenges tutorial-intro.py
Sorting Easy Insertion Sort - Part 1 insertionsort1.py
Sorting Easy Insertion Sort - Part 2 insertionsort2.py
Sorting Easy Correctness and the Loop Invariant correctness-invariant.py
Sorting Easy Running Time of Algorithms runningtime.py
Sorting Easy Quicksort 1 - Partition quicksort1.py
Sorting Easy Counting Sort 1 countingsort1.py
Sorting Easy Counting Sort 2 countingsort2.py
Sorting Easy Closest Numbers closest-numbers.py
Sorting Easy Find the Median find-the-median.py
Sorting Medium The Full Counting Sort countingsort4.py
Search Easy Ice Cream Parlor icecream-parlor.py
Search Easy Missing Numbers missing-numbers.py
Search Easy Sherlock and Array sherlock-and-array.py
Search Medium KnightL on a Chessboard knightl-on-chessboard.py
Search Medium Connected Cells in a Grid connected-cell-in-a-grid.py
Search Medium Pairs pairs.py
Graph Theory Hard Dijkstra: Shortest Reach 2 dijkstrashortreach.py
Greedy Easy Minimum Absolute Difference in an Array minimum-absolute-difference-in-an-array.py
Greedy Easy Marc's Cakewalk marcs-cakewalk.py
Greedy Easy Grid Challenge grid-challenge.py
Greedy Easy Luck Balance luck-balance.py
Greedy Easy Maximum Perimeter Triangle maximum-perimeter-triangle.py
Greedy Easy Beautiful Pairs beautiful-pairs.py
Greedy Easy Sherlock and The Beast sherlock-and-the-beast.py
Greedy Easy Priyanka and Toys priyanka-and-toys.py
Greedy Easy Largest Permutation largest-permutation.py
Greedy Easy Mark and Toys mark-and-toys.py
Greedy Easy Jim and the Orders jim-and-the-orders.py
Greedy Easy Permuting Two Arrays two-arrays.py
Greedy Medium Max Min angry-children.py
Dynamic Programming Medium The Coin Change Problem coin-change.py
Dynamic Programming Medium Equal equal.py
Bit Manipulation Easy Lonely Integer lonely-integer.py
Bit Manipulation Easy Maximizing XOR maximizing-xor.py
Bit Manipulation Easy Sum vs XOR sum-vs-xor.py
Bit Manipulation Easy Flipping bits flipping-bits.py
Bit Manipulation Medium Counter game counter-game.py
Bit Manipulation Medium Xor-sequence xor-se.py
Bit Manipulation Medium The Great XOR the-great-xor.py
Bit Manipulation Medium Yet Another Minimax Problem yet-another-minimax-problem.py
Bit Manipulation Medium Sansa and XOR sansa-and-xor.py
Bit Manipulation Medium AND Product and-product.py
Bit Manipulation Medium Cipher cipher.py
Recursion Medium The Power Sum the-power-sum.py
Recursion Medium Recursive Digit Sum recursive-digit-sum.py
Recursion Medium Password Cracker password-cracker.py
Recursion Hard K Factorization k-factorization.py
Recursion Advanced Repetitive K-Sums repeat-k-sums.py
Game Theory Easy Game of Stones game-of-stones-1.py
Game Theory Easy Tower Breakers tower-breakers-1.py
Game Theory Easy A Chessboard Game a-chessboard-game-1.py
Game Theory Easy Introduction to Nim Game nim-game-1.py
Game Theory Easy Misère Nim misere-nim-1.py
Game Theory Easy Poker Nim poker-nim-1.py
Game Theory Easy Nimble Game nimble-game-1.py

Data Structures

Subdomain Difficulty Challenge Solution
Arrays Easy Arrays - DS arrays-ds.py
Arrays Easy 2D Array - DS 2d-array.py
Arrays Easy Dynamic Array dynamic-array.py
Arrays Easy Left Rotation array-left-rotation.py
Arrays Medium Sparse Arrays sparse-arrays.py
Arrays Hard Array Manipulation crush.py
Linked Lists Easy Print the Elements of a Linked List print-the-elements-of-a-linked-list.py
Linked Lists Easy Insert a Node at the Tail of a Linked List insert-a-node-at-the-tail-of-a-linked-list.py
Linked Lists Easy Insert a node at the head of a linked list insert-a-node-at-the-head-of-a-linked-list.py
Linked Lists Easy Insert a node at a specific position in a linked list insert-a-node-at-a-specific-position-in-a-linked-list.py
Linked Lists Easy Delete a Node delete-a-node-from-a-linked-list.py
Linked Lists Easy Print in Reverse print-the-elements-of-a-linked-list-in-reverse.py
Linked Lists Easy Reverse a linked list reverse-a-linked-list.py
Linked Lists Easy Compare two linked lists compare-two-linked-lists.py
Linked Lists Easy Merge two sorted linked lists merge-two-sorted-linked-lists.py
Linked Lists Easy Get Node Value get-the-value-of-the-node-at-a-specific-position-from-the-tail.py
Linked Lists Easy Delete duplicate-value nodes from a sorted linked list delete-duplicate-value-nodes-from-a-sorted-linked-list.py
Linked Lists Easy Find Merge Point of Two Lists find-the-merge-point-of-two-joined-linked-lists.py
Linked Lists Easy Inserting a Node Into a Sorted Doubly Linked List insert-a-node-into-a-sorted-doubly-linked-list.py
Linked Lists Easy Reverse a doubly linked list reverse-a-doubly-linked-list.py
Linked Lists Medium Cycle Detection detect-whether-a-linked-list-contains-a-cycle.py
Trees Easy Tree: Preorder Traversal tree-preorder-traversal.py
Trees Easy Tree: Postorder Traversal tree-postorder-traversal.py
Trees Easy Tree: Inorder Traversal tree-inorder-traversal.py
Trees Easy Tree: Height of a Binary Tree tree-height-of-a-binary-tree.py
Trees Easy Tree : Top View tree-top-view.py
Trees Easy Tree: Level Order Traversal tree-level-order-traversal.py
Trees Easy Binary Search Tree : Insertion binary-search-tree-insertion.py
Trees Easy Binary Search Tree : Lowest Common Ancestor binary-search-tree-lowest-common-ancestor.py
Trees Medium Tree: Huffman Decoding tree-huffman-decoding.py
Trees Medium Swap Nodes [Algo] swap-nodes-algo.py
Trees Medium Is This a Binary Search Tree? is-binary-search-tree.py
Balanced Trees Medium Self Balancing Tree self-balancing-tree.c
Balanced Trees Hard Median Updates median.py
Stacks Easy Maximum Element maximum-element.py
Stacks Easy Equal Stacks equal-stacks.py
Stacks Medium Balanced Brackets balanced-brackets.py
Stacks Medium Game of Two Stacks game-of-two-stacks.py
Stacks Medium Largest Rectangle largest-rectangle.py
Stacks Medium Simple Text Editor simple-text-editor.py
Stacks Medium Waiter waiter.py
Stacks Hard Poisonous Plants poisonous-plants.py
Stacks Hard AND xor OR and-xor-or.py
Queues Medium Queue using Two Stacks queue-using-two-stacks.py
Queues Medium Castle on the Grid castle-on-the-grid.py
Queues Medium Down to Zero II down-to-zero-ii.py
Queues Hard Truck Tour truck-tour.py
Queues Hard Queries with Fixed Length queries-with-fixed-length.py
Heap Easy QHEAP1 qheap1.py
Heap Easy Jesse and Cookies jesse-and-cookies.py
Heap Hard Find the Running Median find-the-running-median.py
Heap Hard Minimum Average Waiting Time minimum-average-waiting-time.py
Disjoint Set Medium Components in a graph components-in-graph.py
Disjoint Set Hard Merging Communities merging-communities.py
Disjoint Set Hard Super Maximum Cost Queries maximum-cost-queries.py
Multiple Choice Hard Data Structures MCQ 1 how-well-do-you-know-trees.py
Multiple Choice Hard Data Structures MCQ 2 are-you-an-expert-on-data-structures.py
Multiple Choice Hard Data Structures MCQ 3 are-you-an-expert-on-data-structures-1.py
Trie Medium Contacts contacts.py
Trie Hard No Prefix Set no-prefix-set.py
Advanced Medium Mr. X and His Shots x-and-his-shots.py
Advanced Medium Jim and the Skyscrapers jim-and-the-skyscrapers.py
Advanced Medium Find Maximum Index Product find-maximum-index-product.py

Python

Subdomain Difficulty Challenge Solution
Introduction Easy Say "Hello, World!" With Python py-hello-world.py
Introduction Easy Python If-Else py-if-else.py
Introduction Easy Arithmetic Operators python-arithmetic-operators.py
Introduction Easy Python: Division python-division.py
Introduction Easy Loops python-loops.py
Introduction Easy Print Function python-print.py
Introduction Medium Write a function write-a-function.py
Basic Data Types Easy List Comprehensions list-comprehensions.py
Basic Data Types Easy Find the Runner-Up Score! find-second-maximum-number-in-a-list.py
Basic Data Types Easy Nested Lists nested-list.py
Basic Data Types Easy Finding the percentage finding-the-percentage.py
Basic Data Types Easy Lists python-lists.py
Basic Data Types Easy Tuples python-tuples.py
Strings Easy sWAP cASE swap-case.py
Strings Easy String Split and Join python-string-split-and-join.py
Strings Easy What's Your Name? whats-your-name.py
Strings Easy Mutations python-mutations.py
Strings Easy Find a string find-a-string.py
Strings Easy String Validators string-validators.py
Strings Easy Text Alignment text-alignment.py
Strings Easy Text Wrap text-wrap.py
Strings Easy Designer Door Mat designer-door-mat.py
Strings Easy String Formatting python-string-formatting.py
Strings Easy Alphabet Rangoli alphabet-rangoli.py
Strings Easy Capitalize! capitalize.py
Strings Medium The Minion Game the-minion-game.py
Strings Medium Merge the Tools! merge-the-tools.py
Sets Easy Introduction to Sets py-introduction-to-sets.py
Sets Easy Symmetric Difference symmetric-difference.py
Sets Easy Set .add() py-set-add.py
Sets Easy Set .discard(), .remove() & .pop() py-set-discard-remove-pop.py
Sets Easy Set .union() Operation py-set-union.py
Sets Easy Set .intersection() Operation py-set-intersection-operation.py
Sets Easy Set .difference() Operation py-set-difference-operation.py
Sets Easy Set .symmetric_difference() Operation py-set-symmetric-difference-operation.py
Sets Easy Set Mutations py-set-mutations.py
Sets Easy The Captain's Room py-the-captains-room.py
Sets Easy Check Subset py-check-subset.py
Sets Easy Check Strict Superset py-check-strict-superset.py
Sets Medium No Idea! no-idea.py
Math Easy Polar Coordinates polar-coordinates.py
Math Easy Mod Divmod python-mod-divmod.py
Math Easy Power - Mod Power python-power-mod-power.py
Math Easy Integers Come In All Sizes python-integers-come-in-all-sizes.py
Math Medium Find Angle MBC find-angle.py
Math Medium Triangle Quest 2 triangle-quest-2.py
Math Medium Triangle Quest python-quest-1.py
Itertools Easy itertools.product() itertools-product.py
Itertools Easy itertools.permutations() itertools-permutations.py
Itertools Easy itertools.combinations() itertools-combinations.py
Itertools Easy itertools.combinations_with_replacement() itertools-combinations-with-replacement.py
Itertools Medium Compress the String! compress-the-string.py
Itertools Medium Iterables and Iterators iterables-and-iterators.py
Itertools Hard Maximize It! maximize-it.py
Collections Easy collections.Counter() collections-counter.py
Collections Easy DefaultDict Tutorial defaultdict-tutorial.py
Collections Easy Collections.namedtuple() py-collections-namedtuple.py
Collections Easy Collections.OrderedDict() py-collections-ordereddict.py
Collections Easy Collections.deque() py-collections-deque.py
Collections Medium Word Order word-order.py
Collections Medium Company Logo most-commons.py
Collections Medium Piling Up! piling-up.py
Date and Time Easy Calendar Module calendar-module.py
Date and Time Medium Time Delta python-time-delta.py
Errors and Exceptions Easy Exceptions exceptions.py
Errors and Exceptions Easy Incorrect Regex incorrect-regex.py
Classes Easy Class 2 - Find the Torsional Angle class-2-find-the-torsional-angle.py
Classes Medium Classes: Dealing with Complex Numbers class-1-dealing-with-complex-numbers.py
Built-Ins Easy Zipped! zipped.py
Built-Ins Easy Input() input.py
Built-Ins Easy Python Evaluation python-eval.py
Built-Ins Easy Any or All any-or-all.py
Built-Ins Medium Athlete Sort python-sort-sort.py
Built-Ins Medium ginortS ginorts.py
Python Functionals Easy Map and Lambda Function map-and-lambda-expression.py
Python Functionals Medium Validating Email Addresses With a Filter validate-list-of-email-address-with-filter.py
Python Functionals Medium Reduce Function reduce-function.py
Regex and Parsing Easy Detect Floating Point Number introduction-to-regex.py
Regex and Parsing Easy Re.split() re-split.py
Regex and Parsing Easy Group(), Groups() & Groupdict() re-group-groups.py
Regex and Parsing Easy Re.findall() & Re.finditer() re-findall-re-finditer.py
Regex and Parsing Easy Re.start() & Re.end() re-start-re-end.py
Regex and Parsing Easy Validating Roman Numerals validate-a-roman-number.py
Regex and Parsing Easy Validating phone numbers validating-the-phone-number.py
Regex and Parsing Easy Validating and Parsing Email Addresses validating-named-email-addresses.py
Regex and Parsing Easy Hex Color Code hex-color-code.py
Regex and Parsing Easy HTML Parser - Part 1 html-parser-part-1.py
Regex and Parsing Easy HTML Parser - Part 2 html-parser-part-2.py
Regex and Parsing Easy Detect HTML Tags, Attributes and Attribute Values detect-html-tags-attributes-and-attribute-values.py
Regex and Parsing Easy Validating UID validating-uid.py
Regex and Parsing Medium Regex Substitution re-sub-regex-substitution.py
Regex and Parsing Medium Validating Credit Card Numbers validating-credit-card-number.py
Regex and Parsing Hard Validating Postal Codes validating-postalcode.py
Regex and Parsing Hard Matrix Script matrix-script.py
XML Easy XML 1 - Find the Score xml-1-find-the-score.py
XML Easy XML2 - Find the Maximum Depth xml2-find-the-maximum-depth.py
Closures and Decorators Easy Standardize Mobile Number Using Decorators standardize-mobile-number-using-decorators.py
Closures and Decorators Easy Decorators 2 - Name Directory decorators-2-name-directory.py
Numpy Easy Arrays np-arrays.py
Numpy Easy Shape and Reshape np-shape-reshape.py
Numpy Easy Transpose and Flatten np-transpose-and-flatten.py
Numpy Easy Concatenate np-concatenate.py
Numpy Easy Zeros and Ones np-zeros-and-ones.py
Numpy Easy Eye and Identity np-eye-and-identity.py
Numpy Easy Array Mathematics np-array-mathematics.py
Numpy Easy Floor, Ceil and Rint floor-ceil-and-rint.py
Numpy Easy Sum and Prod np-sum-and-prod.py
Numpy Easy Min and Max np-min-and-max.py
Numpy Easy Mean, Var, and Std np-mean-var-and-std.py
Numpy Easy Dot and Cross np-dot-and-cross.py
Numpy Easy Inner and Outer np-inner-and-outer.py
Numpy Easy Polynomials np-polynomials.py
Numpy Easy Linear Algebra np-linear-algebra.py
Debugging Medium Words Score words-score.py
Debugging Medium Default Arguments default-arguments.py

Linux Shell

Subdomain Difficulty Challenge Solution
Bash Easy Let's Echo bash-tutorials-lets-echo.sh
Bash Easy Looping and Skipping bash-tutorials---looping-and-skipping.sh
Bash Easy A Personalized Echo bash-tutorials---a-personalized-echo.sh
Bash Easy Looping with Numbers bash-tutorials---looping-with-numbers.sh
Bash Easy The World of Numbers bash-tutorials---the-world-of-numbers.sh
Bash Easy Comparing Numbers bash-tutorials---comparing-numbers.sh
Bash Easy Getting started with conditionals bash-tutorials---getting-started-with-conditionals.sh
Bash Easy More on Conditionals bash-tutorials---more-on-conditionals.sh
Bash Medium Arithmetic Operations bash-tutorials---arithmetic-operations.sh
Bash Medium Compute the Average bash-tutorials---compute-the-average.sh
Bash Hard Functions and Fractals - Recursive Trees - Bash! fractal-trees-all.sh
Text Processing Easy Cut #1 text-processing-cut-1.sh
Text Processing Easy Cut #2 text-processing-cut-2.sh
Text Processing Easy Cut #3 text-processing-cut-3.sh
Text Processing Easy Cut #4 text-processing-cut-4.sh
Text Processing Easy Cut #5 text-processing-cut-5.sh
Text Processing Easy Cut #6 text-processing-cut-6.sh
Text Processing Easy Cut #7 text-processing-cut-7.sh
Text Processing Easy Cut #8 text-processing-cut-8.sh
Text Processing Easy Cut #9 text-processing-cut-9.sh
Text Processing Easy Head of a Text File #1 text-processing-head-1.sh
Text Processing Easy Head of a Text File #2 text-processing-head-2.sh
Text Processing Easy Middle of a Text File text-processing-in-linux---the-middle-of-a-text-file.sh
Text Processing Easy Tail of a Text File #1 text-processing-tail-1.sh
Text Processing Easy Tail of a Text File #2 text-processing-tail-2.sh
Text Processing Easy 'Tr' Command #1 text-processing-tr-1.sh
Text Processing Easy 'Tr' Command #2 text-processing-tr-2.sh
Text Processing Easy 'Tr' Command #3 text-processing-tr-3.sh
Text Processing Easy Sort Command #1 text-processing-sort-1.sh
Text Processing Easy Sort Command #2 text-processing-sort-2.sh
Text Processing Easy Sort Command #3 text-processing-sort-3.sh
Text Processing Easy Sort Command #4 text-processing-sort-4.sh
Text Processing Easy Sort Command #5 text-processing-sort-5.sh
Text Processing Easy 'Sort' command #6 text-processing-sort-6.sh
Text Processing Easy 'Sort' command #7 text-processing-sort-7.sh
Text Processing Easy 'Uniq' Command #1 text-processing-in-linux-the-uniq-command-1.sh
Text Processing Easy 'Uniq' Command #2 text-processing-in-linux-the-uniq-command-2.sh
Text Processing Easy 'Uniq' Command #3 text-processing-in-linux-the-uniq-command-3.sh
Text Processing Easy 'Uniq' Command #4 text-processing-in-linux-the-uniq-command-4.sh
Text Processing Medium Paste - 3 paste-3.sh
Text Processing Medium Paste - 4 paste-4.sh
Text Processing Medium Paste - 1 paste-1.sh
Text Processing Medium Paste - 2 paste-2.sh
Arrays in Bash Easy Read in an Array bash-tutorials-read-in-an-array.sh
Arrays in Bash Easy Slice an Array bash-tutorials-slice-an-array.sh
Arrays in Bash Easy Concatenate an array with itself bash-tutorials-concatenate-an-array-with-itself.sh
Arrays in Bash Easy Display an element of an array bash-tutorials-display-the-third-element-of-an-array.sh
Arrays in Bash Easy Count the number of elements in an Array bash-tutorials-count-the-number-of-elements-in-an-array.sh
Arrays in Bash Medium Filter an Array with Patterns bash-tutorials-filter-an-array-with-patterns.sh
Arrays in Bash Medium Remove the First Capital Letter from Each Element bash-tutorials-remove-the-first-capital-letter-from-each-array-element.sh
Arrays in Bash Hard Lonely Integer - Bash! lonely-integer-2.sh
Grep Sed Awk Easy 'Grep' - A text-processing-in-linux-the-grep-command-4.sh
Grep Sed Awk Easy 'Grep' - B text-processing-in-linux-the-grep-command-5.sh
Grep Sed Awk Easy 'Sed' command #3 text-processing-in-linux-the-sed-command-3.sh
Grep Sed Awk Hard 'Sed' command #4 sed-command-4.sh
Grep Sed Awk Hard 'Sed' command #5 sed-command-5.sh
Grep Sed Awk Medium 'Awk' - 1 awk-1.sh
Grep Sed Awk Medium 'Awk' - 2 awk-2.sh
Grep Sed Awk Medium 'Awk' - 3 awk-3.sh
Grep Sed Awk Medium 'Awk' - 4 awk-4.sh
Grep Sed Awk Medium 'Grep' #1 text-processing-in-linux-the-grep-command-1.sh
Grep Sed Awk Medium 'Grep' #2 text-processing-in-linux-the-grep-command-2.sh
Grep Sed Awk Medium 'Grep' #3 text-processing-in-linux-the-grep-command-3.sh
Grep Sed Awk Medium 'Sed' command #1 text-processing-in-linux-the-sed-command-1.sh
Grep Sed Awk Medium 'Sed' command #2 text-processing-in-linux-the-sed-command-2.sh

CPP

Subdomain Difficulty Challenge Solution
Introduction Easy Say "Hello, World!" With C++ cpp-hello-world.cpp
Introduction Easy Input and Output cpp-input-and-output.cpp
Introduction Easy Basic Data Types c-tutorial-basic-data-types.cpp
Introduction Easy Conditional Statements c-tutorial-conditional-if-else.cpp
Introduction Easy For Loop c-tutorial-for-loop.cpp
Introduction Easy Functions c-tutorial-functions.cpp
Introduction Easy Pointer c-tutorial-pointer.cpp
Introduction Easy Arrays Introduction arrays-introduction.cpp
Introduction Easy Variable Sized Arrays variable-sized-arrays.cpp
Strings Easy StringStream c-tutorial-stringstream.cpp
Strings Easy Strings c-tutorial-strings.cpp
Classes Easy Structs c-tutorial-struct.cpp
Classes Easy Class c-tutorial-class.cpp
Classes Easy Classes and Objects classes-objects.cpp
Classes Easy Box It! box-it.cpp
Classes Medium Inherited Code inherited-code.cpp
Classes Medium Exceptional Server exceptional-server.cpp
Classes Medium Virtual Functions virtual-functions.cpp
STL Easy Vector-Sort vector-sort.cpp
STL Easy Vector-Erase vector-erase.cpp
STL Easy Lower Bound-STL cpp-lower-bound.cpp
STL Easy Sets-STL cpp-sets.cpp
STL Easy Maps-STL cpp-maps.cpp
STL Easy Print Pretty prettyprint.cpp
STL Medium Deque-STL deque-stl.cpp

C

Subdomain Difficulty Challenge Solution
Introduction Easy "Hello World!" in C hello-world-c.c
Introduction Easy Playing With Characters playing-with-characters.c
Introduction Easy Sum and Difference of Two Numbers sum-numbers-c.c
Introduction Easy Functions in C functions-in-c.c
Introduction Easy Pointers in C pointer-in-c.c
Conditionals and Loops Easy Conditional Statements in C conditional-statements-in-c.c
Conditionals and Loops Easy For Loop in C for-loop-in-c.c
Conditionals and Loops Easy Sum of Digits of a Five Digit Number sum-of-digits-of-a-five-digit-number.c
Conditionals and Loops Easy Bitwise Operators bitwise-operators-in-c.c
Conditionals and Loops Medium Printing Pattern using Loops printing-pattern-2.c
Arrays and Strings Medium 1D Arrays in C 1d-arrays-in-c.c
Arrays and Strings Medium Array Reversal reverse-array-c.c
Arrays and Strings Medium Printing Tokens printing-tokens-.c
Arrays and Strings Medium Digit Frequency frequency-of-digits-1.c
Arrays and Strings Medium Dynamic Array in C dynamic-array-in-c.c
Functions Easy Calculate the Nth term recursion-in-c.c
Functions Easy Students Marks Sum students-marks-sum.c
Functions Medium Permutations of Strings permutations-of-strings.c
Functions Medium Variadic functions in C variadic-functions-in-c.c
Functions Hard Sorting Array of Strings sorting-array-of-strings.c
Structs and Enums Easy Boxes through a Tunnel too-high-boxes.c
Structs and Enums Medium Small Triangles, Large Triangles small-triangles-large-triangles.c
Structs and Enums Hard Post Transition post-transition.c

Interview Preparation Kit

Subdomain Difficulty Challenge Solution
Warmup Easy Counting Valleys counting-valleys.py
Warmup Easy Jumping on the Clouds jumping-on-the-clouds.py
Warmup Easy Repeated String repeated-string.py
Warmup Easy Sock Merchant sock-merchant.py
Arrays Easy 2D Array - DS 2d-array.py
Arrays Easy Arrays: Left Rotation ctci-array-left-rotation.py
Arrays Medium Minimum Swaps 2 minimum-swaps-2.py
Arrays Medium New Year Chaos new-year-chaos.py
Arrays Hard Array Manipulation crush.py
Dictionaries and Hashmaps Easy Hash Tables: Ransom Note ctci-ransom-note.py
Dictionaries and Hashmaps Easy Two Strings two-strings.py
Dictionaries and Hashmaps Medium Count Triplets count-triplets-1.py
Dictionaries and Hashmaps Medium Frequency Queries frequency-queries.py
Dictionaries and Hashmaps Medium Sherlock and Anagrams sherlock-and-anagrams.py
Graphs Hard BFS: Shortest Reach in a Graph ctci-bfs-shortest-reach.py
Graphs Hard DFS: Connected Cell in a Grid ctci-connected-cell-in-a-grid.py
Greedy Algorithms Easy Luck Balance luck-balance.py
Greedy Algorithms Easy Minimum Absolute Difference in an Array minimum-absolute-difference-in-an-array.py
Greedy Algorithms Medium Greedy Florist greedy-florist.py
Greedy Algorithms Medium Max Min angry-children.py
linked Lists Easy Find Merge Point of Two Lists find-the-merge-point-of-two-joined-linked-lists.py
Linked Lists Easy Insert a node at a specific position in a linked list insert-a-node-at-a-specific-position-in-a-linked-list.py
Linked Lists Easy Inserting a Node Into a Sorted Doubly Linked List insert-a-node-into-a-sorted-doubly-linked-list.py
Linked Lists Easy Linked Lists: Detect a Cycle ctci-linked-list-cycle.py
Linked Lists Easy Reverse a doubly linked list reverse-a-doubly-linked-list.py
Miscellaneous Easy Flipping bits flipping-bits.py
Miscellaneous Medium Time Complexity: Primality ctci-big-o.py
Recursion and Backtracking Easy Recursion: Fibonacci Numbers ctci-fibonacci-numbers.py
Recursion and Backtracking Medium Recursion: Davis' Staircase ctci-recursive-staircase.py
Recursion and Backtracking Medium Recursive Digit Sum recursive-digit-sum.py
Search Medium Hash Tables: Ice Cream Parlor ctci-ice-cream-parlor.py
Search Medium Swap Nodes [Algo] swap-nodes-algo.py
Search Medium Pairs pairs.py
Search Medium Triple sum triple-sum.py
Search Medium Minimum Time Required minimum-time-required.py
Sorting Easy Mark and Toys mark-and-toys.py
Sorting Easy Sorting: Bubble Sort ctci-bubble-sort.py
Sorting Medium Fraudulent Activity Notifications fraudulent-activity-notifications.py
Sorting Medium Sorting: Comparator ctci-comparator-sorting.py
Sorting Hard Merge Sort: Counting Inversions ctci-merge-sort.py
Stacks and Queues Medium Balanced Brackets balanced-brackets.py
Stacks and Queues Medium Castle on the Grid castle-on-the-grid.py
Stacks and Queues Medium Largest Rectangle largest-rectangle.py
Stacks and Queues Medium Queues: A Tale of Two Stacks ctci-queue-using-two-stacks.py
Stacks and Queues Hard Poisonous Plants poisonous-plants.py
Strings Easy Alternating Characters alternating-characters.py
Strings Easy Strings: Making Anagrams ctci-making-anagrams.py
Strings Medium Sherlock and the Valid String sherlock-and-valid-string.py
Strings Medium Special Palindrome Again special-palindrome-again.py
Strings Medium Common Child common-child.py
Trees Easy Binary Search Tree : Lowest Common Ancestor binary-search-tree-lowest-common-ancestor.py
Trees Easy Tree: Height of a Binary Tree tree-height-of-a-binary-tree.py
Trees Medium Tree: Huffman Decoding tree-huffman-decoding.py
Trees Medium Trees: Is This a Binary Search Tree? ctci-is-binary-search-tree.py

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