Interview warm-up

Short whiteboard warmups

Under construction

Still being built. Things may change

Total results4,880 problems

Jane's First Words
Easy2
String matching, String
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Rectangle intersection
Easy2
Geometry, Intervals
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Cipher
Easy2
Brute force, String
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Euclid
Easy2
Number theory
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Lamp
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Maximum Frequency
Easy2
Hash map, Array
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Zeros in a Factorial
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Route
Easy2
Array, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
The Euclidean Algorithm
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Word Puzzle
Easy2
Hash map, String
No attempts yet
Time limit
3s
Memory limit
256 MB
Judgeable
Cedric's cypher
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
The Hardest Problem Ever
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Vote
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Party Invitation
Easy2
Simulation, Array
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Mirror Tender
Easy2
Intervals
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Microwave Buttons
Easy2
Greedy, Math
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Palindrome Lines
Easy2
Two pointers, String
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Magic Squares
Easy2
Matrix, Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Clean Up
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Odysseus and the Sirens
Easy2
Implementation, String+1
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Milo of Croton and the Calf
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Dice Game
Easy2
Probability, Brute force
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Train Passengers
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Headshot
Easy2
Probability, String
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Radix 32 Conversion
Easy2
Math, String
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Alarm Clock
Easy2
Brute force, Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Pangram Checker
Easy2
String, Hash map
No attempts yet
Time limit
3s
Memory limit
256 MB
Judgeable
Queens on Bad Terms
Easy2
Implementation, Matrix
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Hitting the Targets
Easy2
Geometry, Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
The Wet Keypad
Easy2
Implementation, Simulation
No attempts yet
Time limit
1s
Memory limit
32 MB
Judgeable
Most Chosen Number
Easy2
Array, Implementation
No attempts yet
Time limit
5s
Memory limit
256 MB
Judgeable
Closest Web Color Name
Easy2
Brute force, Math
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Crossword Clue Numbering
Easy2
Implementation, Matrix
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Cow Routing
Easy2
Implementation, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Paprika ID Cards
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Weather Forecaster
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Canteen Checkout
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Wait Time
Easy2
Simulation, Hash map
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Rotating the basket order
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Belts
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Counting Friends
Easy2
Graph, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Divide the land into triangles
Easy2
Sorting
No attempts yet
Time limit
1s
Memory limit
16 MB
Judgeable
Veni, vidi, vici
Easy2
String, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Best guess in the random game
Easy2
Math, Intervals
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Base Conversion 2
Easy2
Math, Implementation
No attempts yet
Time limit
0.5s
Memory limit
256 MB
Judgeable
Inverse Move-to-Front Transform
Easy2
Simulation, Array
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Spring 2005: Arriving at USC
Easy2
Two pointers, String matching
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Sieve of Eratosthenes
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
ICPC Calculator
Easy2
Recursion, Tree+1
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Pattern Word Banking
Easy2
Simulation, String
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Secret Message
Easy2
Matrix, Simulation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Letter Cookies
Easy2
Hash map, String
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Negative People in Da House
Easy2
Prefix sum, Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Election
Easy2
Geometry, Brute force+1
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Reverse the Binary Digits
Easy2
Bit manipulation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Toilet Seat Policies
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Flag Quiz
Easy2
Brute force, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Choosing an Exam Set
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
ITAI Virus
Easy2
Graph, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Creature Number Systems
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Cypher
Easy2
String, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Solitaire
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Coverity Crossword
Easy2
String matching, Matrix+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Eakspay igpay atinlay?
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Crushing Confections
Easy2
Matrix, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
The Big Eye in the Sky
Easy2
Math, Geometry
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Mr. Gorbachev, Tear Down This Wall!
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Distribution in Metagonia
Easy2
Simulation, Math+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Lucky Chances
Easy2
Brute force, Matrix+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Spin the number wheel
Easy2
Brute force, String
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Hidden Password
Easy2
Simulation, String
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
D as in Daedalus
Easy2
Simulation
No attempts yet
Time limit
3s
Memory limit
256 MB
Judgeable
Base Conversion
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Marko's T9 input
Easy2
String, Hash map
No attempts yet
Time limit
2s
Memory limit
64 MB
Judgeable
Egg Drop Log
Easy2
Intervals, Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Stand on Zanzibar
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Cities Alice has visited
Easy2
Hash map
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Identifying Map Tiles
Easy2
Bit manipulation, String
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Dice Cup
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Easy Problemset
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Bottled-Up Feelings
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
A Towering Problem
Easy2
Brute force, Sorting
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Lost Exponents
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Donation Packaging
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
YODA
Easy2
String, Simulation
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Bear in the Trap
Easy2
Brute force, Implementation
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Number tag exchange
Easy2
Simulation, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Speed Violation
Easy2
Two pointers, Simulation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Milk Pails
Easy2
Brute force
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Circular Barn
Easy2
Brute force, Simulation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Dance Around the Clock (Small)
Easy2
Simulation
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Lazy Spelling Bee (Large)
Easy2
Combinatorics, String+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
gMatrix (Small)
Easy2
Brute force, Matrix+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Baza
Easy2
Brute force, Matrix
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
GBus Count (Small)
Easy2
Brute force, Intervals
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
GBus Count (Large)
Easy2
Brute force, Intervals+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
New Lottery Game (Small)
Easy2
Brute force, Bit manipulation
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Tic-Tac-Toe-Tomek (Small)
Easy2
Implementation, Matrix
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Tic-Tac-Toe-Tomek (Large)
Easy2
Implementation, Brute force+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Fair and Square (Small)
Easy2
Brute force, Math+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
Jane's First WordsCheck each input word against the pattern da+dd?(i\|y) and print whether Jane called for daddy or is cooing.	Easy2	String matchingString	No attempts yet	1s	128 MB	Judgeable
Rectangle intersectionCompute the area shared by all n axis-aligned rectangles, or 0 when they do not all overlap.	Easy2	GeometryIntervals	No attempts yet	2s	512 MB	Judgeable
CipherDecrypt a Caesar-shifted message by trying all 26 shifts and picking the one where both CHIPMUNKS and LIVE appear.	Easy2	Brute forceString	No attempts yet	2s	512 MB	Judgeable
EuclidRead two positive integers up to 32767 and print their greatest common divisor.	Easy2	Number theory	No attempts yet	2s	512 MB	Judgeable
LampGuards patrol in roster order, each toggling the lamps in one arithmetic progression, and you report how many lamps stay on.	Easy2	SimulationArray	No attempts yet	1s	128 MB	Judgeable
Maximum FrequencyGiven N integers, count how many times each value appears and print the largest count.	Easy2	Hash mapArray	No attempts yet	2s	1024 MB	Judgeable
Zeros in a FactorialCount how many zero digits appear in the decimal representation of n factorial for a given n below 100.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
RouteCount the maximal runs of level, uphill, and downhill metre sections along the looped jogging route starting at pole 1.	Easy2	ArrayImplementation	No attempts yet	2s	1024 MB	Judgeable
The Euclidean AlgorithmCount how many subtraction steps the original Euclidean algorithm needs to find the gcd of two integers up to 32767.	Easy2	SimulationMath	No attempts yet	1s	128 MB	Judgeable
Word PuzzleDecide for each pair of strings whether the gathered letters can be rearranged to form the original word.	Easy2	Hash mapString	No attempts yet	3s	256 MB	Judgeable
Cedric's cypherDecrypt each Caesar-ciphered line using the trailing encrypted A to recover the shift and drop that marker.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
The Hardest Problem EverDecode each START/END block by shifting every uppercase letter five places back and leaving other characters unchanged.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
VoteEach judge votes for the most interesting game they can afford, and the game with the most votes wins.	Easy2	SimulationArray	No attempts yet	1s	128 MB	Judgeable
Party InvitationSimulate m rounds of removing every person at a multiple of ri from the ordered list and print the survivors in order.	Easy2	SimulationArray	No attempts yet	2s	256 MB	Judgeable
Mirror TenderDecide for each test case whether one workshop's width and height ranges contain every other workshop's ranges.	Easy2	Intervals	No attempts yet	1s	256 MB	Judgeable
Microwave ButtonsPress the 5-minute, 1-minute, and 10-second buttons to total exactly T seconds with the fewest presses, or print -1 when impossible.	Easy2	GreedyMath	No attempts yet	1s	64 MB	Judgeable
Palindrome LinesDecide for each of n short lines whether it reads the same forward and backward, ignoring letter case.	Easy2	Two pointersString	No attempts yet	1s	256 MB	Judgeable
Magic SquaresCheck each test case square by comparing every row, column, and both diagonal sums and report whether it is magic.	Easy2	MatrixSimulation	No attempts yet	1s	256 MB	Judgeable
Clean UpRecompute each of the nine batting averages after adding the new series and reorder the lineup around the new best average.	Easy2	SimulationImplementation	No attempts yet	1s	256 MB	Judgeable
Odysseus and the SirensThe program scores every melody under each candidate key by summing note penalties and prints the numbered key with the smallest total.	Easy2	ImplementationString+1	No attempts yet	1s	256 MB	Judgeable
Milo of Croton and the CalfSimulate Milo lifting the calf as it gains a pound a day, with strength gains after 3 days and soreness lasting 2 days, and report the first failure day.	Easy2	Simulation	No attempts yet	1s	256 MB	Judgeable
Dice GameEach player rolls two dice with consecutive face ranges and the larger total wins, so compute both win probabilities from the four ranges.	Easy2	ProbabilityBrute force	No attempts yet	1s	256 MB	Judgeable
Train PassengersDecide if per-station counts of passengers leaving, boarding, and left waiting fit the train capacity and boarding rules.	Easy2	SimulationImplementation	No attempts yet	1s	256 MB	Judgeable
HeadshotAfter a click on a circular cylinder, compare firing at once against spinning first and print which choice is safer.	Easy2	ProbabilityString	No attempts yet	1s	64 MB	Judgeable
Radix 32 ConversionConvert each base-32 string of up to 8 digits to its decimal value and to binary by expanding every digit to 5 bits.	Easy2	MathString	No attempts yet	1s	64 MB	Judgeable
Alarm ClockPrint the earliest hh:mm time whose four digits use exactly n lit segments, or Impossible when no such time exists.	Easy2	Brute forceImplementation	No attempts yet	2s	256 MB	Judgeable
Pangram CheckerCount how many times each English letter appears in every sentence and print its pangram grade.	Easy2	StringHash map	No attempts yet	3s	256 MB	Judgeable
Queens on Bad TermsCheck an 8x8 board holding eight queens and print valid only when no two queens share a row, column, or diagonal.	Easy2	ImplementationMatrix	No attempts yet	1s	256 MB	Judgeable
Hitting the TargetsCount, for each of up to 100 shot points, how many of up to 30 given rectangles and circles contain it, boundaries included.	Easy2	GeometryImplementation	No attempts yet	2s	256 MB	Judgeable
The Wet KeypadGiven a permuted phone keypad, encode a message of up to 100 letters into multi-tap presses with # separators.	Easy2	ImplementationSimulation	No attempts yet	1s	32 MB	Judgeable
Most Chosen NumberPick the number that appears most often in each test case, breaking ties by the smaller number.	Easy2	ArrayImplementation	No attempts yet	5s	256 MB	Judgeable
Closest Web Color NameThe program maps each RGB triple to the closest of 16 named HTML colors by Euclidean distance, breaking ties by table order.	Easy2	Brute forceMath	No attempts yet	2s	256 MB	Judgeable
Crossword Clue NumberingScan the grid for empty cells that begin a word of at least three cells across or down and print them in reading order.	Easy2	ImplementationMatrix	No attempts yet	1s	256 MB	Judgeable
Cow RoutingFind the cheapest single flight route on which city A appears before city B, or report -1 when none exists.	Easy2	ImplementationArray	No attempts yet	1s	256 MB	Judgeable
Paprika ID CardsSimulate one left-to-right pass of conditional card swaps, then count paprikas whose final card matches their goal.	Easy2	SimulationArray	No attempts yet	1s	256 MB	Judgeable
Weather ForecasterClouds drift east one cell per minute, and each cell reports how many minutes until a cloud first arrives, or -1 if none ever does.	Easy2	SimulationArray	No attempts yet	1s	256 MB	Judgeable
Canteen CheckoutChoose the number of fixed-price 4-item set menus that minimizes the total bill for the tray.	Easy2	Brute forceMath	No attempts yet	1s	64 MB	Judgeable
Wait TimeReconstruct message timestamps from the log and sum each friend reply wait time, reporting -1 for a friend with an unanswered message.	Easy2	SimulationHash map	No attempts yet	1s	256 MB	Judgeable
Rotating the basket orderPerform M given segment rotations on baskets numbered 1 to N and print the final left-to-right order.	Easy2	SimulationArray	No attempts yet	1s	256 MB	Judgeable
BeltsGiven each belt rotation ratio and twist, compute the last wheel speed and direction when the first wheel turns clockwise once per minute.	Easy2	SimulationMath	No attempts yet	1s	256 MB	Judgeable
Counting FriendsCount the friends of each of N students from M mutual friendship pairs and print the N totals.	Easy2	GraphArray	No attempts yet	1s	256 MB	Judgeable
Divide the land into trianglesSort all pegs by x then y, split the order into consecutive triples, and print each triple's input numbers in increasing order.	Easy2	Sorting	No attempts yet	1s	16 MB	Judgeable
Veni, vidi, viciDrop the last letter of each odd-length ciphertext, then decode every letter pair into one plain letter with the given key.	Easy2	StringMath	No attempts yet	1s	256 MB	Judgeable
Best guess in the random gamePick the number from 1 to N whose interval of radius K covers the most hidden values and report its coverage count.	Easy2	MathIntervals	No attempts yet	1s	256 MB	Judgeable
Base Conversion 2Convert the decimal number N to base B, writing digits above 9 as uppercase letters.	Easy2	MathImplementation	No attempts yet	0.5s	256 MB	Judgeable
Inverse Move-to-Front TransformReconstruct the lowercase string from its move-to-front code by simulating the 26-letter list.	Easy2	SimulationArray	No attempts yet	2s	256 MB	Judgeable
Spring 2005: Arriving at USCFilter the building list to names that hold the abbreviation letters as a case-insensitive subsequence and print the matches in input order.	Easy2	Two pointersString matching	No attempts yet	1s	256 MB	Judgeable
Sieve of EratosthenesSimulate the sieve of Eratosthenes as described and print the K-th crossed-out number for each N and K pair.	Easy2	SimulationImplementation	No attempts yet	1s	256 MB	Judgeable
ICPC CalculatorEvaluate a dot-indented prefix expression where + sums its operands and * multiplies them.	Easy2	RecursionTree+1	No attempts yet	1s	256 MB	Judgeable
Pattern Word BankingAdd the PIN digits picked by lowercase pattern letters and print non sequitur if the letter values do not match the PIN length.	Easy2	SimulationString	No attempts yet	2s	256 MB	Judgeable
Secret MessagePad each message with asterisks to a square, rotate the square 90 degrees clockwise, then read it row by row without asterisks.	Easy2	MatrixSimulation	No attempts yet	2s	256 MB	Judgeable
Letter CookiesGiven the letters in a box, decide for each query word whether its letters can all be taken from the box.	Easy2	Hash mapString	No attempts yet	1s	256 MB	Judgeable
Negative People in Da HouseGiven each test case's sequence of entries and exits, compute the smallest initial occupancy that keeps the count nonnegative throughout.	Easy2	Prefix sumSimulation	No attempts yet	1s	256 MB	Judgeable
ElectionFor each test case, count how many coins overlap each coin and print the top name or TIE on ties.	Easy2	GeometryBrute force+1	No attempts yet	1s	256 MB	Judgeable
Reverse the Binary DigitsRead N, write it in binary without leading zeros, reverse the digits, and print the reversed string as a decimal number.	Easy2	Bit manipulationMath	No attempts yet	1s	256 MB	Judgeable
Toilet Seat PoliciesCount seat moves under leave-up, leave-down, and leave-as-preferred policies given the initial seat position and each person in order.	Easy2	Simulation	No attempts yet	1s	256 MB	Judgeable
Flag QuizPrint the alternatives whose maximum position-wise difference to any other alternative is smallest.	Easy2	Brute forceArray	No attempts yet	1s	256 MB	Judgeable
Choosing an Exam SetYou compare exam sets by random-guess expected score and pick the highest, preferring fewer questions then the smaller number.	Easy2	ImplementationMath	No attempts yet	1s	256 MB	Judgeable
ITAI VirusCount the initially infected cities plus every city directly joined to one by a single road.	Easy2	GraphImplementation	No attempts yet	1s	256 MB	Judgeable
Creature Number SystemsConvert each given decimal number up to 5000 into the creature's base between 2 and 20, using letters A to J for digits above 9.	Easy2	MathImplementation	No attempts yet	1s	256 MB	Judgeable
CypherDecrypt each message line by shifting its lowercase letters back by the Caesar shift computed from its date.	Easy2	StringMath	No attempts yet	1s	256 MB	Judgeable
SolitaireSimulate token moves on cells 0 to N with a repeating six-roll generator and sum landed values until reaching N.	Easy2	Simulation	No attempts yet	1s	256 MB	Judgeable
Coverity CrosswordDecide whether every listed word appears horizontally, vertically, or diagonally in an 8 by 8 letter grid.	Easy2	String matchingMatrix+1	No attempts yet	2s	256 MB	Judgeable
Eakspay igpay atinlay?Translate each phrase into Pig Latin by moving each leading consonant cluster to the end with ay, or adding yay after vowel-initial words.	Easy2	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Crushing ConfectionsFind the lexicographically smallest row or column triple of equal candies in each grid and print its positions.	Easy2	MatrixImplementation	No attempts yet	1s	256 MB	Judgeable
The Big Eye in the SkyFor each point in the first quadrant, print its angle from the positive x-axis in degrees, rounded to the nearest integer.	Easy2	MathGeometry	No attempts yet	1s	256 MB	Judgeable
Mr. Gorbachev, Tear Down This Wall!Add up the lengths of the axis-aligned wall segments and report the total work hours split across the workers, rounded up.	Easy2	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Distribution in MetagoniaRepeatedly peel off 2^a times the largest power of 3 fitting the odd part of the remainder until it hits zero, then print the pieces sorted.	Easy2	SimulationMath+1	No attempts yet	2s	256 MB	Judgeable
Lucky ChancesCount over every grid cell how many of the four directions contain only smaller numbers or reach the edge.	Easy2	Brute forceMatrix+1	No attempts yet	2s	256 MB	Judgeable
Spin the number wheelCount the wheel positions where the M digits read clockwise form a number between X and Y.	Easy2	Brute forceString	No attempts yet	1s	256 MB	Judgeable
Hidden PasswordDecide if scanning the message and skipping letters outside the remaining password set reproduces the password in order.	Easy2	SimulationString	No attempts yet	1s	256 MB	Judgeable
D as in DaedalusGiven each round budget and the cards played, compute the extra points the first player could have won by playing the best card each round.	Easy2	Simulation	No attempts yet	3s	256 MB	Judgeable
Base ConversionConvert the given number written in base A into base B and print its digits separated by spaces.	Easy2	MathImplementation	No attempts yet	2s	256 MB	Judgeable
Marko's T9 inputCount how many dictionary words map letter by letter to the given T9 digit string.	Easy2	StringHash map	No attempts yet	2s	64 MB	Judgeable
Egg Drop LogFrom the logged safe and broken drops, compute the lowest floor that could break and the highest floor that could stay safe.	Easy2	IntervalsImplementation	No attempts yet	2s	256 MB	Judgeable
Stand on ZanzibarThe program adds yearly increases beyond twice the previous count to bound the number of imported turtles.	Easy2	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Cities Alice has visitedCount how many different city names appear in each trip log.	Easy2	Hash map	No attempts yet	1s	256 MB	Judgeable
Identifying Map TilesConvert a map tile quadkey into its zoom level and x and y coordinates.	Easy2	Bit manipulationString	No attempts yet	1s	256 MB	Judgeable
Dice CupFind the most likely sums of an N-sided and an M-sided die, printing every tied sum from lowest to highest.	Easy2	Brute forceMath	No attempts yet	1s	256 MB	Judgeable
Easy ProblemsetSimulate judges proposing problems in turn and keep each proposal whose hardness reaches the running total until k problems are chosen.	Easy2	Simulation	No attempts yet	1s	256 MB	Judgeable
Bottled-Up FeelingsFind counts of two bottle sizes that sum exactly to the shipment volume with the fewest bottles, or report Impossible.	Easy2	Brute forceMath	No attempts yet	1s	256 MB	Judgeable
A Towering ProblemSplit six distinct box heights into two triples matching the two given tower heights and print each triple in decreasing order.	Easy2	Brute forceSorting	No attempts yet	1s	256 MB	Judgeable
Lost ExponentsSplit each integer into a base from all but the last digit and an exponent from the last digit, then print the sum of the powers.	Easy2	MathImplementation	No attempts yet	1s	64 MB	Judgeable
Donation PackagingTrack the stock of three relief sets day by day, ship every packable trio once at least 30 are ready, and print the shipped count or NO.	Easy2	SimulationMath	No attempts yet	1s	256 MB	Judgeable
YODACompare two numbers digit by digit from the right and drop the smaller digit at each position, printing YODA for a number left with no digits.	Easy2	StringSimulation	No attempts yet	1s	64 MB	Judgeable
Bear in the TrapFind the smallest and largest integers between L and D whose digits sum to X.	Easy2	Brute forceImplementation	No attempts yet	1s	64 MB	Judgeable
Number tag exchangeSimulate M bubble passes over the line, swapping neighbors when the front tag has the larger remainder modulo the pass number.	Easy2	SimulationImplementation	No attempts yet	2s	512 MB	Judgeable
Speed ViolationTwo speed profiles split the same 100 km road at different points, and you report the largest amount by which the driven speed exceeds the limit.	Easy2	Two pointersSimulation	No attempts yet	2s	512 MB	Judgeable
Milk PailsCombine pours of sizes X and Y without exceeding M to get as close to M as possible.	Easy2	Brute force	No attempts yet	2s	512 MB	Judgeable
Circular BarnChoose the entry room on a circular barn so cows walking clockwise to their assigned rooms cover the smallest total distance.	Easy2	Brute forceSimulation	No attempts yet	2s	512 MB	Judgeable
Dance Around the Clock (Small)Simulate up to 10 rounds of alternating pairwise swaps around a circle of at most 10 dancers and report the two neighbors of dancer K.	Easy2	Simulation	No attempts yet	5s	512 MB	Judgeable
Lazy Spelling Bee (Large)Count distinct words formed by picking each letter from its neighbors in the target word, modulo 1e9+7.	Easy2	CombinatoricsString+1	No attempts yet	5s	512 MB	Judgeable
gMatrix (Small)Build the matrix from the given formula and add the largest entry of every K by K consecutive submatrix.	Easy2	Brute forceMatrix+1	No attempts yet	5s	512 MB	Judgeable
BazaCount the database rows that match each query in every column not marked -1.	Easy2	Brute forceMatrix	No attempts yet	1s	64 MB	Judgeable
GBus Count (Small)Count, for each queried city, how many of the given inclusive ranges cover it.	Easy2	Brute forceIntervals	No attempts yet	5s	512 MB	Judgeable
GBus Count (Large)Count, for each queried city, how many of the given inclusive intervals cover it.	Easy2	Brute forceIntervals+1	No attempts yet	5s	512 MB	Judgeable
New Lottery Game (Small)Count pairs (a, b) with a below A and b below B whose bitwise AND is below K.	Easy2	Brute forceBit manipulation	No attempts yet	5s	512 MB	Judgeable
Tic-Tac-Toe-Tomek (Small)Given a 4 by 4 tic-tac-toe board with a wildcard T, report whether X won, O won, the game is a draw, or play continues.	Easy2	ImplementationMatrix	No attempts yet	5s	512 MB	Judgeable
Tic-Tac-Toe-Tomek (Large)Given a 4x4 tic-tac-toe board with a wildcard T, report whether X won, O won, the game is a draw, or play continues.	Easy2	ImplementationBrute force+1	No attempts yet	5s	512 MB	Judgeable
Fair and Square (Small)Count numbers in each interval [A, B] that are palindromes and squares of palindromes.	Easy2	Brute forceMath+1	No attempts yet	5s	512 MB	Judgeable