Interview warm-up

Short whiteboard warmups

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Total results4,880 problems

Next in Line
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Rotating Letters
Easy2
String, Implementation+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Speed fines are not fine!
Easy2
Implementation, Math+2
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Big Bang Secrets
Easy2
Implementation, String+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Sumac Sequences
Easy2
Simulation, Math
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
What is n, Daddy?
Easy2
Math, Brute force+2
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Computer Purchase
Easy2
Sorting, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
ISBN 1-3-Sum
Easy2
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Do the Shuffle
Easy2
Simulation, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
It's Cold Here!
Easy2
Implementation, Array+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Who is in the middle?
Easy2
Sorting, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Deal or No Deal Calculator
Easy2
Implementation, Array+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Anagram Checker
Easy2
Hash map, String+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
The Cell Sell
Easy2
Implementation, Math+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Snow Calls
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Mouse Move
Easy2
Simulation, Implementation+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Squares
Easy2
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Terms of Office
Easy2
Math, Implementation+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Smile with Similes
Easy2
Implementation, Brute force+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Constrained Permutations
Easy2
Brute force, Combinatorics+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
AmeriCanadian
Easy2
String, Implementation+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Fraction Action
Easy2
Math, Number theory+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Dressing Up
Easy2
Implementation, Simulation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Calendar
Easy2
Implementation, Simulation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Shift Letters
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Anagrams
Easy2
String, Hash map+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
String
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Nonogram
Easy2
Implementation, Array+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Numbers
Easy2
Math, Sorting+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Building Blocks
Easy2
Math, Brute force
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Cards
Easy2
Array, Hash map+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
The Worm Turns
Easy2
Simulation, Implementation+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Counting Sheep
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Entropy
Easy2
Hash map, Math+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Right Triangle Check
Easy2
Math, Geometry+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Gauss
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Exercise
Easy2
Simulation, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Teleprime
Easy2
Number theory, Math+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Ways to Make Rectangles
Easy2
Math, Brute force+1
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Ant Names
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Rhyming Verses
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Park
Easy2
Prefix sum, Array
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Bagels on a Stick
Easy2
Array
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Hidden Number
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Caesar Cipher
Easy2
String, Array+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Sums and Differences
Easy2
Math, Combinatorics
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Step on the Foot
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Dividing the Chocolate Bar
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Overlapping Rectangle Area
Easy2
Geometry
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Ranking Manipulation
Easy2
Array, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Making Grid Paper
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Thumbtacks
Easy2
Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Chess
Easy2
Greedy, Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Pear Trees and Apple Trees
Easy2
Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Mondays
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Karaoke
Easy2
Sliding window, String
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Palindrome Coloring
Easy2
String, Two pointers
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Rock Paper Scissors
Easy2
Probability, Math+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Shoe Factory
Easy2
Prefix sum, Brute force
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Bookmakers
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Rock Paper Scissors
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Turtle
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Sales
Easy2
Brute force, Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Careless Addition
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Train
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Olympic Country Ranking
Easy2
Sorting, Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Old Bill
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Clock
Easy2
Math, Sorting+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Display
Easy2
Greedy, Simulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Tidying the Banquet Tables
Easy2
Brute force, Matrix
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Mathematical Curiosity
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Sir Bedavere's Bogus Division
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Consecutive Digits in a Rational Number
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Pig Latin
Easy2
String, Simulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Crossword Puzzle Clue Numbering
Easy2
Simulation, Matrix+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Winning at tic-tac-toe
Easy2
Brute force, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Painting Party
Easy2
Simulation, Matrix
No attempts yet
Time limit
5s
Memory limit
128 MB
Judgeable
Integer Flipping
Easy2
Bit manipulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Ironclad Security Algorithm
Easy2
Hash map, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Fast Food Prizes
Easy2
Greedy, Math+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Marathoner
Easy2
Implementation, Hash map
No attempts yet
Time limit
2s
Memory limit
64 MB
Judgeable
Sequence Folding Game
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Triangle Classification
Easy2
Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Arbiter Login
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Zombie Invasion
Easy2
Simulation, Math
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Arrangement of Contest
Easy2
Greedy, String+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Boxes
Easy2
Simulation, Matrix
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Text Roll
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Perfect Number Check
Easy2
Number theory, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
I Love Croatia
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Roman Catholic Mass
Easy2
Brute force, Matrix+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Presidential Election
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Contest Venue Setup
Easy2
Matrix, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Combination Lock
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Vicinity
Easy2
Brute force, Geometry
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Stone Game 5
Easy2
Game theory, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Show Me The Operators
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Anti-Arithmetic Permutation
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Fibonacci remainder
Easy2
Math, Simulation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Word Searching
Easy2
String matching, String
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
Next in LineGiven the ages of the youngest and middle of three children in an arithmetic sequence, print the oldest child's age.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Rotating LettersGiven a single uppercase word, decide whether every letter belongs to the set of seven letters that look the same after a 180-degree rotation.	Easy2	StringImplementation+2	No attempts yet	1s	128 MB	Judgeable
Speed fines are not fine!Given a speed limit and a recorded speed, decide whether the car is speeding and print the matching fine from a three-tier table.	Easy2	ImplementationMath+2	No attempts yet	2s	512 MB	Judgeable
Big Bang SecretsDecode an uppercase word by shifting each letter backward by S = 3P + K positions, where P is the letter's 1-based position.	Easy2	ImplementationString+1	No attempts yet	2s	512 MB	Judgeable
Sumac SequencesStarting from two integers, repeatedly replace the pair with (second, first minus second) until the difference turns negative and report how many terms appear.	Easy2	SimulationMath	No attempts yet	2s	512 MB	Judgeable
What is n, Daddy?Count the ordered pairs (a, b) with 1 <= b <= a <= 5 and possibly a single hand, summing to n.	Easy2	MathBrute force+2	No attempts yet	2s	512 MB	Judgeable
Computer PurchaseGiven n computers with RAM, CPU speed, and disk values, sort by the score 2R + 3S + D and print the top two names, breaking ties by smaller name.	Easy2	SortingImplementation	No attempts yet	2s	512 MB	Judgeable
ISBN 1-3-SumGiven the last three digits of an ISBN starting with 9780921418, compute the 1-3-sum and print it.	Easy2	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
Do the ShuffleSimulate a fixed 5-song playlist through button presses that rotate left, rotate right, or swap the first two songs, then print the final order.	Easy2	SimulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
It's Cold Here!Read city names with integer temperatures, one per line, and print the name of the city with the lowest temperature.	Easy2	ImplementationArray+2	No attempts yet	1s	128 MB	Judgeable
Who is in the middle?Given the weights of three bowls, print the middle value among the three weights.	Easy2	SortingImplementation	No attempts yet	1s	128 MB	Judgeable
Deal or No Deal CalculatorRead eliminated case numbers and a Banker's offer, compute the average of the remaining amounts, and print deal if the offer is higher, otherwise no deal.	Easy2	ImplementationArray+1	No attempts yet	1s	128 MB	Judgeable
Anagram CheckerDecide whether two phrases are anagrams, ignoring spaces and letters only.	Easy2	Hash mapString+1	No attempts yet	1s	128 MB	Judgeable
The Cell SellGiven daytime, evening, and weekend minutes, compute the monthly cost under two phone plans and print the cheaper one.	Easy2	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Snow CallsConvert each alphanumeric phone number to digits, keep the first 10 digits, and print them in xxx-xxx-xxxx form.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Mouse MoveThe cursor starts at (0,0) on a screen of width c and height r; each relative move is clamped to the screen edges, and the position after every move must be printed.	Easy2	SimulationImplementation+2	No attempts yet	1s	128 MB	Judgeable
SquaresGiven a number of tiles, find the largest integer side length whose square does not exceed that number.	Easy2	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
Terms of OfficePrint every year from X to Y in which all four offices change, which happens on multiples of lcm(4,2,3,5) = 60, formatted as a fixed sentence.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
Smile with SimilesGiven up to five adjectives and five nouns, print every phrase of the form "<adjective> as <noun>" in nested input order.	Easy2	ImplementationBrute force+2	No attempts yet	1s	128 MB	Judgeable
Constrained PermutationsCount permutations of 1..n (n at most 9) that satisfy given ordering constraints x before y.	Easy2	Brute forceCombinatorics+2	No attempts yet	1s	128 MB	Judgeable
AmeriCanadianRead words one per line until the line quit!, and for each word rewrite a trailing consonant followed by or as our when the word has at least five letters.	Easy2	StringImplementation+2	No attempts yet	1s	128 MB	Judgeable
Fraction ActionReduce a numerator and denominator to simplest form, then print it as a whole number, a proper fraction, or a mixed number.	Easy2	MathNumber theory+1	No attempts yet	1s	128 MB	Judgeable
Dressing UpRead an odd height H and print a bow tie of H rows where each side widens as rows approach the middle.	Easy2	ImplementationSimulation+1	No attempts yet	1s	128 MB	Judgeable
CalendarGiven the weekday of the 1st and the number of days, print a month calendar in a fixed weekly layout with right-aligned columns.	Easy2	ImplementationSimulation+1	No attempts yet	1s	128 MB	Judgeable
Shift LettersFor each test case, rotate the letters of a word right by n positions and print the result in a fixed sentence format.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
AnagramsGiven two lowercase words, decide whether one can be rearranged into the other, and print the result with the words.	Easy2	StringHash map+1	No attempts yet	1s	128 MB	Judgeable
StringCollapse every run of identical consecutive letters in a lowercase string into a single letter and print the result.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
NonogramGiven a grid of black and white squares, print the lengths of the consecutive black blocks in each row and then each column.	Easy2	ImplementationArray+2	No attempts yet	1s	1024 MB	Judgeable
NumbersGiven three distinct digits and one of their six permutations, find that number's 1-based rank when all six permutations are sorted ascending.	Easy2	MathSorting+2	No attempts yet	1s	1024 MB	Judgeable
Building BlocksGiven a target height N and three block heights, pick the kind whose multiples get closest to N, breaking ties by smaller block then shorter tower.	Easy2	MathBrute force	No attempts yet	1s	1024 MB	Judgeable
CardsA 52-card deck is missing exactly one card; given the other 51 cards as suit and value pairs, output the missing suit and value.	Easy2	ArrayHash map+2	No attempts yet	1s	1024 MB	Judgeable
The Worm TurnsSimulate a 20-cell worm on a 50x50 grid through a list of moves, stopping when it hits itself, leaves the board, or finishes.	Easy2	SimulationImplementation+2	No attempts yet	1s	128 MB	Judgeable
Counting SheepCount how many words in each list match the string "sheep" exactly, case-sensitive, and print the count per list with blank lines between cases.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
EntropyRead one line of text, count how often each character appears, and print the Shannon entropy rounded to three decimals.	Easy2	Hash mapMath+2	No attempts yet	1s	128 MB	Judgeable
Right Triangle CheckFor each of n triples of side lengths, decide whether the triangle is right by checking if the largest side squared equals the sum of the other two squared.	Easy2	MathGeometry+2	No attempts yet	1s	128 MB	Judgeable
GaussFor each test case, compute the sum of all integers from n to m inclusive and print the test case number followed by the sum.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
ExerciseFor each machine, multiply each exercise level's energy rate by its duration and sum the totals per person.	Easy2	SimulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
TeleprimeGiven a six-digit number and a digit to prepend, print Yes if both the original and the resulting seven-digit number are prime.	Easy2	Number theoryMath+2	No attempts yet	1s	128 MB	Judgeable
Ways to Make RectanglesCount the number of unordered pairs (a, b) with a <= b and a*b <= n.	Easy2	MathBrute force+1	No attempts yet	1s	256 MB	Judgeable
Ant NamesGiven up to 100 lowercase names, print the maximum number of distinct letters found in any single name.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Rhyming VersesCount pairs of lines with the same number of vowels and identical last k letters ignoring spaces.	Easy2	StringImplementation	No attempts yet	1s	512 MB	Judgeable
ParkFor each of up to one million heights in order, output the maximum height to its west and to its east, using its own height when no higher point exists.	Easy2	Prefix sumArray	No attempts yet	1s	512 MB	Judgeable
Bagels on a StickSlide a chosen bagel off one end of the stick after removing the fewest bagels it cannot slide through.	Easy2	Array	No attempts yet	1s	512 MB	Judgeable
Hidden NumberSum every maximal run of digits in a word of letters and digits, ignoring leading zeros.	Easy2	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Caesar CipherDecode a Caesar-shifted uppercase message by matching its most frequent letter to the given original letter.	Easy2	StringArray+1	No attempts yet	1s	512 MB	Judgeable
Sums and DifferencesCount ordered pairs from distinct positions where the difference exceeds the sum, which holds exactly when the second element is negative.	Easy2	MathCombinatorics	No attempts yet	1s	128 MB	Judgeable
Step on the FootKozik and Adrian alternately shorten the gap by their foot lengths, and the first player facing a gap shorter than his foot wins.	Easy2	Math	No attempts yet	1s	128 MB	Judgeable
Dividing the Chocolate BarTwo brothers split an a by b chocolate bar with one straight cut so the two pieces differ in area as little as possible.	Easy2	Math	No attempts yet	1s	128 MB	Judgeable
Overlapping Rectangle AreaGiven two axis-aligned rectangles, compute the area of their overlapping region.	Easy2	Geometry	No attempts yet	1s	128 MB	Judgeable
Ranking ManipulationChoose weights on the tasks you solved so you finish first, then count the contestants tied with you.	Easy2	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
Making Grid PaperPick the sheet that yields the most grid cells under the margin and spacing rules, breaking ties by area, and output its area.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
ThumbtacksFind the smallest jump that crosses the bridge using only planks without thumbtacks.	Easy2	Array	No attempts yet	1s	128 MB	Judgeable
ChessEach row holds at most one rook, so take the largest value in every row with a positive maximum and add them.	Easy2	GreedyArray	No attempts yet	1s	128 MB	Judgeable
Pear Trees and Apple TreesFind the largest distance between any pear tree and any apple tree in a row of n trees.	Easy2	Array	No attempts yet	1s	128 MB	Judgeable
MondaysGiven year length N, week length M, and starting weekday L, count the days from 1 to N that fall on the first weekday.	Easy2	Math	No attempts yet	1s	128 MB	Judgeable
KaraokeCount the starting positions where the next K characters of the song string are all vowels.	Easy2	Sliding windowString	No attempts yet	2s	128 MB	Judgeable
Palindrome ColoringSplit each A/B string into the fewest palindromic subsequences and output that count.	Easy2	StringTwo pointers	No attempts yet	1s	128 MB	Judgeable
Rock Paper ScissorsCompare the two players' winning chances from their move probabilities and print who is more likely to win each match.	Easy2	ProbabilityMath+1	No attempts yet	1s	128 MB	Judgeable
Shoe FactoryChoose the price p from 1 to N that maximizes the count of buyers willing to pay p times the margin p minus K.	Easy2	Prefix sumBrute force	No attempts yet	1s	128 MB	Judgeable
BookmakersDecide whether stakes on both match outcomes can guarantee a profit given decimal odds X and Y.	Easy2	Math	No attempts yet	1s	128 MB	Judgeable
Rock Paper ScissorsSimulate k rounds of rock-paper-scissors across N robots, removing round losers until one robot remains or all rounds end in a draw.	Easy2	Simulation	No attempts yet	1s	128 MB	Judgeable
TurtleSimulate the turtle's moves from the origin and report the area of the axis-aligned bounding box of its path.	Easy2	Simulation	No attempts yet	1s	128 MB	Judgeable
SalesFor each test case, count pairs of days where the earlier day sold no more than the later day and print the total.	Easy2	Brute forceArray	No attempts yet	1s	128 MB	Judgeable
Careless AdditionAdd two integers digit by digit from the right with no carries and print the column sums in order.	Easy2	ImplementationString	No attempts yet	1s	128 MB	Judgeable
TrainPassengers board in order into the non-full car with the fewest same-initial riders, ties broken by load then car number, and the program prints each car count.	Easy2	SimulationArray	No attempts yet	1s	128 MB	Judgeable
Olympic Country RankingCount how many countries beat country K on gold, then silver, then bronze medals, and report its rank.	Easy2	SortingArray	No attempts yet	1s	128 MB	Judgeable
Old BillGiven N and middle digits XYZ, fill in the first and last digits of the five-digit total so N divides it, choosing the largest valid total.	Easy2	Brute forceMath	No attempts yet	1s	128 MB	Judgeable
ClockFind the time with the median clock-hand angle among five given times, breaking angle ties by earlier time.	Easy2	MathSorting+1	No attempts yet	1s	128 MB	Judgeable
DisplayFit the words of a space-separated text into the fewest rows of width w, breaking a row only when the next word does not fit.	Easy2	GreedySimulation	No attempts yet	1s	128 MB	Judgeable
Tidying the Banquet TablesFour teams sit mixed across four tables, and you assign one team to each table so the fewest guests move.	Easy2	Brute forceMatrix	No attempts yet	1s	128 MB	Judgeable
Mathematical CuriosityCount pairs 0<a<b<n where a squared plus b squared plus m is divisible by a times b.	Easy2	Brute forceMath	No attempts yet	1s	128 MB	Judgeable
Sir Bedavere's Bogus DivisionPrint every three-digit fraction with numerator in L to R that keeps its value after erasing the shared digit.	Easy2	Brute forceMath	No attempts yet	1s	128 MB	Judgeable
Consecutive Digits in a Rational NumberReport the base-7 digits in positions f through l after the point for the fraction n over d.	Easy2	SimulationMath	No attempts yet	1s	128 MB	Judgeable
Pig LatinConvert each word to Pig Latin by moving leading consonants to the end and appending ay.	Easy2	StringSimulation	No attempts yet	1s	128 MB	Judgeable
Crossword Puzzle Clue NumberingScan the letter grid, number each square that starts an across or down word, and list every entry number with its letter count.	Easy2	SimulationMatrix+1	No attempts yet	1s	128 MB	Judgeable
Winning at tic-tac-toeTry each empty cell on the 3x3 board and print the board with the smallest winning move filled.	Easy2	Brute forceImplementation	No attempts yet	1s	128 MB	Judgeable
Painting PartyPaint up to 100 filled or one-pixel-border rectangles in order on an N by N grid and print the final colors.	Easy2	SimulationMatrix	No attempts yet	5s	128 MB	Judgeable
Integer FlippingReverse the order of the 32 bits of each given unsigned integer and print the resulting value, stopping at -1.	Easy2	Bit manipulation	No attempts yet	1s	128 MB	Judgeable
Ironclad Security AlgorithmYou invert the word permutation defined by the two public keys and apply it to the ciphertext to recover the plaintext.	Easy2	Hash mapArray	No attempts yet	1s	256 MB	Judgeable
Fast Food PrizesAdd up, over disjoint prize sets, the prize value times the smallest sticker count among its required kinds.	Easy2	GreedyMath+1	No attempts yet	2s	128 MB	Judgeable
MarathonerCount the listed students who finished within 6 hours and report the fastest one, breaking ties by race result order.	Easy2	ImplementationHash map	No attempts yet	2s	64 MB	Judgeable
Sequence Folding GameRepeatedly fold the list by adding symmetric pairs until two numbers remain, then Alice wins when the first is larger.	Easy2	SimulationArray	No attempts yet	1s	128 MB	Judgeable
Triangle ClassificationFor each of T triples of side lengths, output whether it is equilateral, isosceles, scalene, or not a triangle.	Easy2	Implementation	No attempts yet	1s	128 MB	Judgeable
Arbiter LoginGiven the original and entered passwords, report login success or hint at a caps lock or num lock mistake.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Zombie InvasionProcess villages east to west, moving half of each village west and leaving at most one behind, with everything gathering on the west coast.	Easy2	SimulationMath	No attempts yet	2s	128 MB	Judgeable
Arrangement of ContestCount the titles that form the longest unbroken run from A onward, using each title's first letter and stopping at the first missing letter.	Easy2	GreedyString+1	No attempts yet	2s	256 MB	Judgeable
BoxesBoxes fall straight down in each column of a grid, and the program sums how many cells all boxes move.	Easy2	SimulationMatrix	No attempts yet	1s	256 MB	Judgeable
Text RollSimulate a ball that rolls right over non-space characters and drops down through spaces until it falls off the last line, then report its exit column.	Easy2	Simulation	No attempts yet	1s	128 MB	Judgeable
Perfect Number CheckDecide whether each given integer equals the sum of its proper divisors and print the equation or a negative verdict.	Easy2	Number theoryImplementation	No attempts yet	2s	128 MB	Judgeable
I Love CroatiaTrack the 210 seconds of answers and pass the bomb left on each correct answer to find who holds it when it explodes.	Easy2	Simulation	No attempts yet	1s	128 MB	Judgeable
Roman Catholic MassThe program seats the latecomer in the empty spot with the most occupied neighbors and counts every adjacent occupied pair once.	Easy2	Brute forceMatrix+1	No attempts yet	1s	128 MB	Judgeable
Presidential ElectionEach voter ranks all candidates, and the program counts first-choice votes and then a top-two runoff to report the winner and the deciding round.	Easy2	SimulationImplementation	No attempts yet	1s	128 MB	Judgeable
Contest Venue SetupCount the schools that have two of their teams seated in king-adjacent cells of an N by M grid with empty seats.	Easy2	MatrixImplementation	No attempts yet	1s	128 MB	Judgeable
Combination LockCount distinct triples of dial positions within circular distance 2 of either of two given combinations.	Easy2	Brute forceMath	No attempts yet	1s	128 MB	Judgeable
VicinityFor each query, count how many of the n points lie within distance d_v of the chosen base point, excluding the base point itself.	Easy2	Brute forceGeometry	No attempts yet	1s	128 MB	Judgeable
Stone Game 5Two players alternately take 1 or 3 stones from a pile of N, and the program prints SK or CY for optimal play.	Easy2	Game theoryMath	No attempts yet	1s	128 MB	Judgeable
Show Me The OperatorsEvaluate each space-separated expression in two left-to-right sweeps and print the operators in execution order with the final value.	Easy2	SimulationImplementation	No attempts yet	1s	128 MB	Judgeable
Anti-Arithmetic PermutationFor each permutation of 0 to n-1, decide whether any three terms in order form an arithmetic progression.	Easy2	Brute forceMath	No attempts yet	1s	128 MB	Judgeable
Fibonacci remainderFor each test case, compute the P-th Fibonacci number of the sequence starting 1, 1 modulo Q and print it as Case #x: M.	Easy2	MathSimulation	No attempts yet	1s	128 MB	Judgeable
Word SearchingCount case-sensitive overlapping occurrences of a given word, each fully inside one line of the following text.	Easy2	String matchingString	No attempts yet	1s	128 MB	Judgeable