Practice

Python coding problems

Every problem has a clear statement, input and output format, limits and worked examples. Pick a topic, read the problem, then solve it in the online editor.

Topic

580 problems

Pass or failConditional Statementseasy
Even or odd order numberConditional Statementseasy
Positive, negative or zeroConditional Statementseasy
Larger of two pricesConditional Statementseasy
Free shippingConditional Statementseasy
Do the passwords matchConditional Statementseasy
Grade letterConditional Statementsmedium
Leap yearConditional Statementsmedium
Largest of threeConditional Statementsmedium
Triangle typeConditional Statementsmedium
FizzBuzz for one numberConditional Statementsmedium
Electricity billConditional Statementsmedium
Day nameConditional Statementsmedium
Income tax slabsConditional Statementshard
Valid dateConditional Statementshard
Roots of a quadraticConditional Statementshard
Delivery chargeConditional Statementshard
Rock, paper, scissorsConditional Statementshard
Go-live countdownLoopseasy
Total of the first n ordersLoopseasy
Times table chartLoopseasy
Even shelf numbersLoopseasy
FactorialLoopseasy
Digits in a ticket numberLoopseasy
Digit sum of an IDLoopsmedium
Reverse a numberLoopsmedium
Palindrome ticketLoopsmedium
Prime checkLoopsmedium
Growth seriesLoopsmedium
Bar report triangleLoopsmedium
Payments until zeroLoopsmedium
Largest square tileLoopshard
Armstrong numberLoopshard
Binary form of a numberLoopshard
Prime factorsLoopshard
Centred pyramidLoopshard
Square of a quantityFunctionseasy
Larger of two ordersFunctionseasy
Even or odd ticket numberFunctionseasy
Delivery fee waiverFunctionseasy
Lowest and highest markFunctionseasy
Grade from marksFunctionseasy
Sum of digitsFunctionsmedium
FactorialFunctionsmedium
Is it a prime?Functionsmedium
GCD and LCMFunctionsmedium
Power with an optional exponentFunctionsmedium
Total, highest and lowest of a few marksFunctionsmedium
Fibonacci numberFunctionsmedium
Primes up to nFunctionshard
Armstrong numberFunctionshard
Steps to reach 1Functionshard
Digital rootFunctionshard
Tower of Hanoi movesFunctionshard
Total of the day's ordersListseasy
Highest and lowest markListseasy
Count the passing marksListseasy
Reverse the delivery listListseasy
Find an itemListseasy
Every second ticketListseasy
Average mark and who beat itListsmedium
Remove repeated customersListsmedium
Second highest scoreListsmedium
Rotate the shift listListsmedium
Is the price list sorted?Listsmedium
Merge two sorted listsListsmedium
How many times each value appearsListsmedium
Zeros to the backListshard
Two orders that add to the targetListshard
Best stretch of k daysListshard
Flip a tableListshard
Walk around the tableListshard
First and last letterStringseasy
Shout the nameStringseasy
Reverse a wordStringseasy
Count the vowelsStringseasy
Count the wordsStringseasy
Palindrome or notStringseasy
Mask the account numberStringsmedium
InitialsStringsmedium
Make a URL slugStringsmedium
Are they anagrams?Stringsmedium
Compress repeated lettersStringsmedium
Letters, digits and spacesStringsmedium
Reverse each wordStringsmedium
First non-repeating letterStringshard
Longest wordStringshard
Strong password checkStringshard
Simple email checkStringshard
Is it a rotation?Stringshard
Distinct customer idsDictionaries & Setseasy
Stock lookupDictionaries & Setseasy
Is the ticket valid?Dictionaries & Setseasy
Count one wordDictionaries & Setseasy
Price list totalDictionaries & Setseasy
Courses both teams useDictionaries & Setseasy
Word frequency reportDictionaries & Setsmedium
First repeated ticketDictionaries & Setsmedium
Group students by gradeDictionaries & Setsmedium
Anagram checkDictionaries & Setsmedium
Customers who bought one or bothDictionaries & Setsmedium
Top-selling productDictionaries & Setsmedium
Missing order numbersDictionaries & Setsmedium
Two Sum indexesDictionaries & Setshard
First unique characterDictionaries & Setshard
Longest consecutive runDictionaries & Setshard
Group the anagramsDictionaries & Setshard
One-to-one letter mappingDictionaries & Setshard
Check an order quantityException Handlingeasy
Divide two numbers safelyException Handlingeasy
Find a product priceException Handlingeasy
Item at a positionException Handlingeasy
Add up the valid numbersException Handlingeasy
Average of valid marksException Handlingmedium
Four-function calculatorException Handlingmedium
Retry until the input is validException Handlingmedium
Bank withdrawalsException Handlingmedium
Read settings linesException Handlingmedium
Order lookup reportException Handlingmedium
Student score recordsException Handlinghard
Stock orders with a custom errorException Handlinghard
Retry a flaky callException Handlinghard
Validate a sign-up formException Handlinghard
Total of the marksFiles & Data Formatseasy
Topper of the classFiles & Data Formatseasy
How many passedFiles & Data Formatseasy
Sum of a JSON listFiles & Data Formatseasy
Average mark from JSONFiles & Data Formatseasy
Order value with a headerFiles & Data Formatsmedium
Head count by departmentFiles & Data Formatsmedium
Names with commasFiles & Data Formatsmedium
Large orders from JSONFiles & Data Formatsmedium
CSV to JSONFiles & Data Formatsmedium
JSON to CSVFiles & Data Formatshard
Safe invoice totalFiles & Data Formatshard
Orders above the averageHow to Approach a Problemeasy
Second largest markHow to Approach a Problemeasy
Repeated customer idHow to Approach a Problemeasy
Days without a weekly holidayHow to Approach a Problemeasy
Ticket code reads the same both waysHow to Approach a Problemeasy
Two orders that match a budgetHow to Approach a Problemmedium
Best-selling productHow to Approach a Problemmedium
Revenue between two daysHow to Approach a Problemmedium
Longest streak of equal marksHow to Approach a Problemmedium
First letter that appears onceHow to Approach a Problemmedium
Smallest missing ticket numberHow to Approach a Problemmedium
Best stretch of k daysHow to Approach a Problemhard
Pairs with a fixed gapHow to Approach a Problemhard
Longest word without a repeated letterHow to Approach a Problemhard
Stretches that add up to zeroHow to Approach a Problemhard
Duplicate order idsTime & Space Complexityeasy
Valid ticket checkTime & Space Complexityeasy
Missing invoice numberTime & Space Complexityeasy
Best-selling productTime & Space Complexityeasy
Total of the largest ordersTime & Space Complexityeasy
Count pairs with a target totalTime & Space Complexitymedium
Range totals of daily salesTime & Space Complexitymedium
Customers in both reportsTime & Space Complexitymedium
Groups of anagram product codesTime & Space Complexitymedium
Marks at or below a scoreTime & Space Complexitymedium
Ways to climb the warehouse stairsTime & Space Complexitymedium
Longest run of different charactersTime & Space Complexityhard
Stretches of days with an exact totalTime & Space Complexityhard
Longest run of consecutive order numbersTime & Space Complexityhard
Distinct products in every windowTime & Space Complexityhard
Average markTesting Your Solutionseasy
Orders above the limitTesting Your Solutionseasy
Largest valueTesting Your Solutionseasy
Last position of a valueTesting Your Solutionseasy
Count the wordsTesting Your Solutionseasy
Second largest distinct valueTesting Your Solutionsmedium
Is the list sorted?Testing Your Solutionsmedium
Remove duplicates, keep the firstTesting Your Solutionsmedium
Rotate right by kTesting Your Solutionsmedium
Balanced bracketsTesting Your Solutionsmedium
Find each valueTesting Your Solutionsmedium
Best stretch of marksTesting Your Solutionshard
Pairs with a given sumTesting Your Solutionshard
Longest run of equal valuesTesting Your Solutionshard
Merge booking timesTesting Your Solutionshard
Reverse a listArray & String Techniqueseasy
Swap the first and last ordersArray & String Techniqueseasy
Move zeros to the endArray & String Techniqueseasy
Rotate right by kArray & String Techniqueseasy
Palindrome checkArray & String Techniqueseasy
Most frequent letterArray & String Techniqueseasy
Remove a value in placeArray & String Techniqueseasy
Merge two sorted listsArray & String Techniquesmedium
Remove duplicates from a sorted listArray & String Techniquesmedium
Sort coloursArray & String Techniquesmedium
Maximum subarray sumArray & String Techniquesmedium
Valid anagramArray & String Techniquesmedium
First non-repeating characterArray & String Techniquesmedium
Reverse the wordsArray & String Techniquesmedium
Best run with its rangeArray & String Techniqueshard
Common items of two sorted listsArray & String Techniqueshard
Longest palindromic substringArray & String Techniqueshard
Best day to buy and sellArray & String Techniqueshard
Group the anagramsArray & String Techniqueshard
Longest substring without repeatsArray & String Techniqueshard
Two prices that match a budgetTwo Pointerseasy
Valid palindrome messageTwo Pointerseasy
Reverse the order listTwo Pointerseasy
Zeros to the backTwo Pointerseasy
Unique values of a sorted listTwo Pointerseasy
Sorted squaresTwo Pointerseasy
Merge two sorted listsTwo Pointerseasy
Container with the most waterTwo Pointersmedium
Pairs under a limitTwo Pointersmedium
Closest pair of costsTwo Pointersmedium
Sort the three levelsTwo Pointersmedium
Triplets that cancel outTwo Pointersmedium
At most two copiesTwo Pointersmedium
Middle of a chainTwo Pointersmedium
Almost a palindromeTwo Pointersmedium
The repeated ticket numberTwo Pointershard
Happy numberTwo Pointershard
Closest triple of costsTwo Pointershard
Rain between the wallsTwo Pointershard
Sticks that make a triangleTwo Pointershard
Best stretch of salesSliding Windoweasy
Totals of every stretchSliding Windoweasy
Good hoursSliding Windoweasy
Most vowels in a rowSliding Windoweasy
Quietest stretchSliding Windoweasy
Stretches with no repeatsSliding Windoweasy
Longest streak above targetSliding Windoweasy
Longest text without a repeatSliding Windowmedium
Shortest run to reach a targetSliding Windowmedium
Longest run within a budgetSliding Windowmedium
Streak with a few repairsSliding Windowmedium
Hidden rearrangementsSliding Windowmedium
Longest piece with limited lettersSliding Windowmedium
Longest run after replacementsSliding Windowmedium
Is a rearrangement inside?Sliding Windowmedium
Minimum window substringSliding Windowhard
Maximum of every stretchSliding Windowhard
Steady stretchSliding Windowhard
Cheap bundlesSliding Windowhard
Exactly K different lettersSliding Windowhard
Range sum queriesPrefix Sums & Hashingeasy
Running balancePrefix Sums & Hashingeasy
Repeated order idPrefix Sums & Hashingeasy
First repeated idPrefix Sums & Hashingeasy
Pair that fits a budgetPrefix Sums & Hashingeasy
Balance pointPrefix Sums & Hashingeasy
Same lettersPrefix Sums & Hashingeasy
Group the anagramsPrefix Sums & Hashingmedium
Blocks with a given totalPrefix Sums & Hashingmedium
Blocks divisible by kPrefix Sums & Hashingmedium
Range add updatesPrefix Sums & Hashingmedium
Block sums in a tablePrefix Sums & Hashingmedium
Longest block with a given totalPrefix Sums & Hashingmedium
Pairs with a given sumPrefix Sums & Hashingmedium
Longest run of consecutive numbersPrefix Sums & Hashingmedium
Longest balanced runPrefix Sums & Hashinghard
Busiest momentPrefix Sums & Hashinghard
Four lists with total zeroPrefix Sums & Hashinghard
Tables with a given totalPrefix Sums & Hashinghard
Shortest removal for a clean totalPrefix Sums & Hashinghard
Find an order idBinary Searcheasy
Where does a new price goBinary Searcheasy
Count one stock levelBinary Searcheasy
Integer square rootBinary Searcheasy
First and last position of a levelBinary Searcheasy
Smallest bundle that is large enoughBinary Searcheasy
Orders inside a price rangeBinary Searcheasy
Smallest value in a rotated listBinary Searchmedium
Find a value in a rotated listBinary Searchmedium
Top of a visitor curveBinary Searchmedium
Smallest truck for the parcelsBinary Searchmedium
Slowest speed that clears the queuesBinary Searchmedium
The k-th missing numberBinary Searchmedium
Look up a code in a sorted gridBinary Searchmedium
The one unpaired itemBinary Searchmedium
Earliest day for the bouquetsBinary Searchhard
Median of two sorted listsBinary Searchhard
Place servers as far apart as possibleBinary Searchhard
Find a value in a rotated list with repeatsBinary Searchhard
The k-th smallest value in a sorted gridBinary Searchhard
Total of the first n ordersRecursion in Deptheasy
FactorialRecursion in Deptheasy
Sum of digitsRecursion in Deptheasy
Reverse a wordRecursion in Deptheasy
Palindrome checkRecursion in Deptheasy
Greatest common divisorRecursion in Deptheasy
Count a value in a listRecursion in Deptheasy
Power with a remainderRecursion in Depthmedium
Fibonacci with a cacheRecursion in Depthmedium
Binary form of a numberRecursion in Depthmedium
Flatten a nested listRecursion in Depthmedium
Tower of HanoiRecursion in Depthmedium
Stairs with 1, 2 or 3 stepsRecursion in Depthmedium
Merge sortRecursion in Depthmedium
Binomial coefficientRecursion in Depthmedium
Count inversionsRecursion in Depthhard
Routes around blocked cellsRecursion in Depthhard
Ways to make a paymentRecursion in Depthhard
Longest common subsequenceRecursion in Depthhard
Last person standingRecursion in Depthhard
Binary access codesBacktrackingeasy
Every subset of a shopping listBacktrackingeasy
Choose a project teamBacktrackingeasy
Courier routesBacktrackingeasy
Keypad wordsBacktrackingeasy
All orders of tasksBacktrackingmedium
Exact budget basketsBacktrackingmedium
Make change with reuseBacktrackingmedium
Balanced bracket stringsBacktrackingmedium
Different subsets with repeatsBacktrackingmedium
Different arrangements of lettersBacktrackingmedium
Palindrome splitsBacktrackingmedium
N-Queens boardBacktrackinghard
Word in a letter gridBacktrackinghard
Mini sudokuBacktrackinghard
Odd or even by the lowest bitBit Manipulation & Matheasy
Count the set bitsBit Manipulation & Matheasy
Is it a power of two?Bit Manipulation & Matheasy
Prime or notBit Manipulation & Matheasy
GCD and LCM of two numbersBit Manipulation & Matheasy
The single numberBit Manipulation & Mathmedium
The missing numberBit Manipulation & Mathmedium
Count the primes up to NBit Manipulation & Mathmedium
Power under a modulusBit Manipulation & Mathmedium
Subsets that add up to a targetBit Manipulation & Mathmedium
Prime factorisationBit Manipulation & Mathmedium
Two numbers that appear onceBit Manipulation & Mathhard
Reverse the 32 bitsBit Manipulation & Mathhard
Largest XOR of two numbersBit Manipulation & Mathhard
Combinations under a modulusBit Manipulation & Mathhard
Pair that makes the targetPattern Practiceeasy
Reads the same both waysPattern Practiceeasy
Sales between two daysPattern Practiceeasy
First ticket seen twicePattern Practiceeasy
Find the delivery slotPattern Practiceeasy
The odd one outPattern Practiceeasy
Whole blocks onlyPattern Practiceeasy
Best stretch of fixed lengthPattern Practicemedium
Fewest orders to reach the goalPattern Practicemedium
Stretches with an exact totalPattern Practicemedium
Pairs within budgetPattern Practicemedium
Longest run without a repeatPattern Practicemedium
Words with the same lettersPattern Practicemedium
Smallest daily capacityPattern Practicemedium
Balanced bracketsPattern Practicemedium
Search on a rotated shelfPattern Practicemedium
Subsets that hit the targetPattern Practicemedium
Big powers with a remainderPattern Practicemedium
All valid bracket codesPattern Practicehard
Ways to reach the top floorPattern Practicehard
Longest run after a few repairsPattern Practicehard
Shortest text that covers the lettersPattern Practicehard
Two lost codesPattern Practicehard
Longest balanced stretchPattern Practicehard
Three values that cancel outPattern Practicehard
Ticket queueLinked Listseasy
Order count and totalLinked Listseasy
First position of an itemLinked Listseasy
Add to both endsLinked Listseasy
Remove the first matchLinked Listseasy
Reverse the listLinked Listseasy
Middle of the listLinked Listseasy
Remove every matchLinked Listsmedium
Remove duplicates from a sorted listLinked Listsmedium
Remove the n-th node from the endLinked Listsmedium
Merge two sorted listsLinked Listsmedium
Palindrome listLinked Listsmedium
Does the list loop?Linked Listsmedium
Add two numbers stored as listsLinked Listsmedium
Odd positions, then even positionsLinked Listsmedium
Where does the loop start?Linked Listshard
Reverse in groups of kLinked Listshard
Sort the listLinked Listshard
Rotate right by kLinked Listshard
Reorder the listLinked Listshard
Matching parenthesesStacks & Queueseasy
Stack commandsStacks & Queueseasy
Queue commandsStacks & Queueseasy
Cancel equal neighboursStacks & Queueseasy
Score recordStacks & Queueseasy
Sum of the last kStacks & Queueseasy
Valid bracketsStacks & Queuesmedium
Postfix evaluationStacks & Queuesmedium
Next greater elementStacks & Queuesmedium
Daily temperaturesStacks & Queuesmedium
Stack with minimumStacks & Queuesmedium
Elimination circleStacks & Queuesmedium
Queue built from two stacksStacks & Queuesmedium
Calculator without bracketsStacks & Queuesmedium
Smallest number after removing digitsStacks & Queueshard
Decode a repeated stringStacks & Queueshard
Largest rectangle in a histogramStacks & Queueshard
Maximum of every windowStacks & Queueshard
Calculator with bracketsStacks & Queueshard
Sum of subarray minimumsStacks & Queueshard
Slot for each keyHash Tables from Scratcheasy
Longest chainHash Tables from Scratcheasy
Distinct customersHash Tables from Scratcheasy
First repeated orderHash Tables from Scratcheasy
Two orders that match a totalHash Tables from Scratcheasy
Linear probing tableHash Tables from Scratchmedium
Probes for each lookupHash Tables from Scratchmedium
Subarrays with a given sumHash Tables from Scratchmedium
Anagram groupsHash Tables from Scratchmedium
Longest consecutive runHash Tables from Scratchmedium
LRU cache simulationHash Tables from Scratchmedium
Growing tableHash Tables from Scratchhard
Longest unique stretchHash Tables from Scratchhard
Random set operationsHash Tables from Scratchhard
Four lists that sum to zeroHash Tables from Scratchhard
Sort the exam marksSorting Algorithmseasy
Is the list already in orderSorting Algorithmseasy
Swaps made by bubble sortSorting Algorithmseasy
Selection sort after k roundsSorting Algorithmseasy
Rank staff by salarySorting Algorithmseasy
Median response timeSorting Algorithmseasy
Merge two sorted price listsSorting Algorithmseasy
Count the inversionsSorting Algorithmsmedium
K-th largest scoreSorting Algorithmsmedium
Sort the three prioritiesSorting Algorithmsmedium
Sort by frequencySorting Algorithmsmedium
Largest number from piecesSorting Algorithmsmedium
Merge overlapping bookingsSorting Algorithmsmedium
Sort by a given orderSorting Algorithmsmedium
Students scoring lowerSorting Algorithmsmedium
Smaller values to the rightSorting Algorithmshard
Pairs with more than doubleSorting Algorithmshard
Largest gap between sorted valuesSorting Algorithmshard
Sort a nearly sorted listSorting Algorithmshard
Fewest swaps to sortSorting Algorithmshard
Count the departmentsBinary Treeseasy
Total sales of a chartBinary Treeseasy
Longest chain of managersBinary Treeseasy
Count the end teamsBinary Treeseasy
Preorder listingBinary Treeseasy
Inorder listingBinary Treeseasy
Postorder listingBinary Treeseasy
Level by levelBinary Treesmedium
What the right side seesBinary Treesmedium
Is the chart balanced?Binary Treesmedium
Longest route between two teamsBinary Treesmedium
Is the tree its own mirror?Binary Treesmedium
A route that pays exactlyBinary Treesmedium
Valid price treeBinary Treesmedium
Zigzag levelsBinary Treesmedium
Where two reporting lines meetBinary Treeshard
Rebuild from two listsBinary Treeshard
Best route anywhereBinary Treeshard
Count the routes with a given totalBinary Treeshard
Distance between two nodesBinary Treeshard
Is the order number in the tree?Binary Search Treeseasy
Cheapest and dearest priceBinary Search Treeseasy
Prices in sorted orderBinary Search Treeseasy
Add a new order numberBinary Search Treeseasy
How tall is the tree?Binary Search Treeseasy
Is the price tree valid?Binary Search Treesmedium
Kth cheapest itemBinary Search Treesmedium
Nearest price below and aboveBinary Search Treesmedium
Remove an order numberBinary Search Treesmedium
Orders in a number rangeBinary Search Treesmedium
Two orders that add upBinary Search Treesmedium
Greater sum treeBinary Search Treeshard
Largest valid price tree insideBinary Search Treeshard
Count the BST shapesBinary Search Treeshard
Merge two price treesBinary Search Treeshard
Is it a min-heap?Heaps & Trieseasy
Heap after pushesHeaps & Trieseasy
K-th largest scoreHeaps & Trieseasy
Last stone weightHeaps & Trieseasy
Dictionary lookupHeaps & Trieseasy
Words with a prefixHeaps & Trieseasy
Common start of wordsHeaps & Trieseasy
Sort with a heapHeaps & Triesmedium
Join the cablesHeaps & Triesmedium
Closest delivery pointsHeaps & Triesmedium
Most frequent tagsHeaps & Triesmedium
Merge sorted shelvesHeaps & Triesmedium
Running medianHeaps & Triesmedium
Rooms for meetingsHeaps & Triesmedium
Autocomplete suggestionsHeaps & Triesmedium
K-th smallest in a sorted tableHeaps & Triesmedium
Dictionary with wildcardsHeaps & Trieshard
Largest XOR of two numbersHeaps & Trieshard
Smallest range over all listsHeaps & Trieshard
Words hidden in a gridHeaps & Trieshard
Links at every nodeGraphs: Basics & Traversaleasy
Can a message get through?Graphs: Basics & Traversaleasy
Fewest links between two officesGraphs: Basics & Traversaleasy
Count separate networksGraphs: Basics & Traversaleasy
Count the land patchesGraphs: Basics & Traversaleasy
How far does the news spread?Graphs: Basics & Traversaleasy
Paint bucketGraphs: Basics & Traversaleasy
Biggest networkGraphs: Basics & Traversalmedium
Loop in the cablingGraphs: Basics & Traversalmedium
Tasks that wait for each otherGraphs: Basics & Traversalmedium
Shortest way through the mazeGraphs: Basics & Traversalmedium
Largest land patchGraphs: Basics & Traversalmedium
Exactly k links awayGraphs: Basics & Traversalmedium
Split into two teamsGraphs: Basics & Traversalmedium
Print the shortest routeGraphs: Basics & Traversalmedium
Spreading infectionGraphs: Basics & Traversalhard
Enclosed land patchesGraphs: Basics & Traversalhard
Maze with one wall breakGraphs: Basics & Traversalhard
Word ladderGraphs: Basics & Traversalhard
Shortest loop in the cablingGraphs: Basics & Traversalhard
Can the tasks be ordered?Graph Algorithmseasy
Count the networksGraph Algorithmseasy
Are these two offices linked?Graph Algorithmseasy
Cheapest delivery routeGraph Algorithmseasy
Cheapest cable networkGraph Algorithmseasy
Smallest valid task orderGraph Algorithmsmedium
The cable that makes a loopGraph Algorithmsmedium
Delivery costs from the depotGraph Algorithmsmedium
Largest friend groupGraph Algorithmsmedium
Fewest rounds to finish a projectGraph Algorithmsmedium
Routes with refundsGraph Algorithmsmedium
Count the cheapest routesGraph Algorithmshard
Best warehouse townGraph Algorithmshard
Narrowest bottleneck roadGraph Algorithmshard
Split the network into regionsGraph Algorithmshard
Fewest notes for a paymentGreedy & Intervalseasy
Students and laptopsGreedy & Intervalseasy
Can one person attend every meeting?Greedy & Intervalseasy
Most non-overlapping bookingsGreedy & Intervalseasy
Can you reach the last cell?Greedy & Intervalseasy
Best single tradeGreedy & Intervalseasy
Largest sum after k sign flipsGreedy & Intervalseasy
Merge overlapping bookingsGreedy & Intervalsmedium
Insert a booking into a calendarGreedy & Intervalsmedium
Meeting rooms neededGreedy & Intervalsmedium
Fewest jumps to the endGreedy & Intervalsmedium
Start of the delivery loopGreedy & Intervalsmedium
Jobs with deadlines for the most profitGreedy & Intervalsmedium
Cancel the fewest bookingsGreedy & Intervalsmedium
Fewest arrows for the balloonsGreedy & Intervalsmedium
Smallest number after removing k digitsGreedy & Intervalshard
Most events attendedGreedy & Intervalshard
Fair reward pointsGreedy & Intervalshard
Shortest schedule with cooldownGreedy & Intervalshard
Fewest refuel stopsGreedy & Intervalshard
Ways to climb a staircaseDynamic Programming (1D)easy
Three kinds of stepsDynamic Programming (1D)easy
Cheapest climbDynamic Programming (1D)easy
Best loot without neighboursDynamic Programming (1D)easy
Best run of daysDynamic Programming (1D)easy
Pay the exact amountDynamic Programming (1D)easy
Fewest coinsDynamic Programming (1D)medium
Ways to pay as sets of coinsDynamic Programming (1D)medium
Ordered paymentsDynamic Programming (1D)medium
Longest rising run of marksDynamic Programming (1D)medium
Ways to read a codeDynamic Programming (1D)medium
Cut a label into wordsDynamic Programming (1D)medium
Fewest square tilesDynamic Programming (1D)medium
Lockers in a ringDynamic Programming (1D)medium
Best product of a runDynamic Programming (1D)medium
Count the ways to cut a labelDynamic Programming (1D)hard
Nested boxesDynamic Programming (1D)hard
Fewest jumpsDynamic Programming (1D)hard
Pick a value, lose its neighboursDynamic Programming (1D)hard
Count the longest rising runsDynamic Programming (1D)hard
Routes across a warehouse floorDynamic Programming (2D)easy
Cheapest delivery routeDynamic Programming (2D)easy
Routes around blocked tilesDynamic Programming (2D)easy
Can the bill be paid exactly?Dynamic Programming (2D)easy
Longest shared order of lettersDynamic Programming (2D)easy
Count mirror substringsDynamic Programming (2D)easy
Best basket for the vanDynamic Programming (2D)medium
Two equal shipmentsDynamic Programming (2D)medium
Fewest edits between two namesDynamic Programming (2D)medium
Longest palindromic subsequenceDynamic Programming (2D)medium
Ways to reach a totalDynamic Programming (2D)medium
Largest square pallet areaDynamic Programming (2D)medium
Longest shared run of lettersDynamic Programming (2D)medium
Plus or minus to reach a targetDynamic Programming (2D)medium
Cheapest order to join machine partsDynamic Programming (2D)hard
Two piles as even as possibleDynamic Programming (2D)hard
Count how often a pattern hides in a wordDynamic Programming (2D)hard
Fewest cuts into mirror piecesDynamic Programming (2D)hard
Best matching of staff to tasksDynamic Programming (2D)hard
Shortest round trip through every depotDynamic Programming (2D)hard