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Total results2,362 problems

Bee
Easy2
Implementation, Array+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Extending Goldbach's Conjecture
Easy2
Math
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
Jane's First Words
Easy2
String matching, String
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Easy Encryption
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Length and Frequency of Sentences
Easy2
String, Hash map+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Form Guide
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
The King
Easy2
Greedy, Math
No attempts yet
Time limit
2s
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
Cuckoo for Hashing
Easy2
Simulation, Hash map+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Undercut
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
128 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
Cellular Automata
Easy2
Brute force, Simulation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Maximum Frequency
Easy2
Hash map, Array
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Cars
Easy2
Simulation, Implementation
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
Mingyun's Password
Easy2
String, Brute force
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Centroid of Point Masses
Easy2
Math, Implementation
No attempts yet
Time limit
3s
Memory limit
128 MB
Judgeable
Word Puzzle
Easy2
Hash map, String
No attempts yet
Time limit
3s
Memory limit
256 MB
Judgeable
Have you had your birthday yet?
Easy2
Implementation
No attempts yet
Time limit
1s
Memory limit
128 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
Polar Explorer
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
HMs and TMs
Easy2
Implementation, Brute force
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
Assigning Partners
Easy2
Hash map, Implementation
No attempts yet
Time limit
1s
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
Finding Nemo
Easy2
String
No attempts yet
Time limit
1s
Memory limit
256 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
Focal Length of a Lens
Easy2
Math, Implementation
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
Word Swap
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Aligned Calendar
Easy2
Math, 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
Tax Rate Changed
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Toroidal grid
Easy2
Implementation, Graph
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
Runway Planning
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Ice Bucket Challenge
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Amino Acid
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
64 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
Van Gogh's Work Schedule
Easy2
Simulation, Queue
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Growling Gears
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Miscalculation
Easy2
Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Triples
Easy2
Brute force, Math
No attempts yet
Time limit
5s
Memory limit
256 MB
Judgeable
Turtle Graphics
Easy2
Simulation, Array
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Alarm Clock
Easy2
Brute force, Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Joy of Flight
Easy2
Implementation, Simulation+1
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
The return of the King
Easy2
String, Greedy
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Eligibility
Easy2
Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Professor Tardiness Max
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Anniversary 1
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Anniversary 2
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Torus
Easy2
Implementation
No attempts yet
Time limit
1s
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
Filter
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Closest Web Color Name
Easy2
Brute force, Math
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Working Hours
Easy2
Implementation, String+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Urdu orthography verification
Easy2
Simulation, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Mushrooms on Half a Pizza
Easy2
Brute force, Array
No attempts yet
Time limit
1s
Memory limit
32 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
Date in Seoul
Easy2
Implementation
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
Rövarspråket
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Wait Time
Easy2
Simulation, Hash map
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Reversing baskets
Easy2
Array, Simulation
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
Comma Separated Sum
Easy2
String, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Four Numbers
Easy2
Implementation, Math
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
International Meeting
Easy2
Math, Implementation
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
SHA-256
Easy2
Implementation
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
Rocket height at last separation
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Three Kangaroos 2
Easy2
Greedy, Math
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
Entrance Examination
Easy2
Array, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
BeeThe program counts logged jobs under each of seven bee work codes and prints each count with its share of the total.	Easy2	ImplementationArray+1	No attempts yet	1s	128 MB	Judgeable
Extending Goldbach's ConjectureThe program reads each m and prints whether m consecutive odd integers sum to m cubed and the first one when they do.	Easy2	Math	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
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
Easy EncryptionEach letter becomes its two-digit code and each digit gains a # prefix while other characters stay unchanged.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Length and Frequency of SentencesCount the words in each of N sentences and report how often each length occurs in ascending order.	Easy2	StringHash map+1	No attempts yet	1s	128 MB	Judgeable
Form GuideParse home and away scorelines into win, draw, and loss marks, print the overall, home, and away form strings, and report the longest run of each mark.	Easy2	ImplementationString	No attempts yet	1s	128 MB	Judgeable
The KingPick any subset of up to 100 values from minus 3 to 3 so the sum of the chosen values raised to the given power 1 to 3 is as large as possible.	Easy2	GreedyMath	No attempts yet	2s	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
Cuckoo for HashingSimulate cuckoo hashing insertions into two mod-indexed tables with displacement and print the final table contents.	Easy2	SimulationHash map+1	No attempts yet	2s	128 MB	Judgeable
UndercutAdd up both players' scores across card rounds where the higher card scores unless the lower card is exactly one less.	Easy2	SimulationImplementation	No attempts yet	1s	128 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
Cellular AutomataSimulate all 64 update rules for g generations on the n by n grid and print the smallest rule that turns the start state into the end state.	Easy2	Brute forceSimulation	No attempts yet	2s	1024 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
CarsSimulate n cars adjusting speed by 5 m/s every 5 seconds to keep gaps within 80 to 100 meters, and output -1 on collision or the front car distance.	Easy2	SimulationImplementation	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
Mingyun's PasswordFind the word whose reverse also appears in the list and print its length and middle letter.	Easy2	StringBrute force	No attempts yet	1s	128 MB	Judgeable
Centroid of Point MassesCompute the mass-weighted average x and y over each point set and print each centroid rounded to two decimals.	Easy2	MathImplementation	No attempts yet	3s	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
Have you had your birthday yet?For each birth date, tell whether its 2007 birthday already passed relative to 4 August, with special outputs for 4 August and 29 February.	Easy2	Implementation	No attempts yet	1s	128 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
Polar ExplorerGiven planet radius, fuel, and the angle to the crash site, decide if the round trip on the shorter arc fits and report leftover fuel or reachable miles.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
HMs and TMsFind all of the first 151 Pokémon that can learn every HM or TM move on the given list and print their numbers in order.	Easy2	ImplementationBrute force	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
Assigning PartnersYou check that every positional pairing is mutual and no student is paired with themselves.	Easy2	Hash mapImplementation	No attempts yet	1s	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
Finding NemoPrint Found for each input line before EOI when the letters n, e, m, o appear in order ignoring case, else Missing.	Easy2	String	No attempts yet	1s	256 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
Focal Length of a LensGiven object and image distances for each test case, compute the lens focal length and print it rounded to one decimal place.	Easy2	MathImplementation	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
Word SwapSum the per-position letter differences between each pair of equal-length words and report the coins earned, paid, or free.	Easy2	ImplementationString	No attempts yet	1s	256 MB	Judgeable
Aligned CalendarConvert each Gregorian date into the 13-month calendar with 28-day months and report the leftover days as holidays.	Easy2	MathImplementation	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
Tax Rate ChangedFind the pair of pre-tax prices that summed to s after x% tax and gives the largest total after y% tax.	Easy2	Brute forceMath	No attempts yet	1s	256 MB	Judgeable
Toroidal gridPrint the given snake sweep of columns 0 to n-2 plus the climb up column n-1 to list a Hamiltonian cycle of the m by n toroidal grid.	Easy2	ImplementationGraph	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
Runway PlanningGiven each heading in degrees, compute the two-digit runway number by rounding and folding to the range 1 to 18.	Easy2	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Ice Bucket ChallengeFind the fewest ice-pouring participants needed to reach a donation goal when each pourer donates 10 and recruits K friends while skippers donate 100.	Easy2	Math	No attempts yet	1s	256 MB	Judgeable
Amino AcidParse each formula into element counts and print the molecular weight, or Invalid formula for other elements.	Easy2	StringImplementation	No attempts yet	1s	64 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
Van Gogh's Work ScheduleSimulate a first-come queue of painting jobs and print arrivals, starts, and finishes for hours 0 to 23.	Easy2	SimulationQueue	No attempts yet	1s	64 MB	Judgeable
Growling GearsFor each gear compute the vertex value of -aR^2 + bR + c and output the gear with the largest maximum.	Easy2	Math	No attempts yet	1s	256 MB	Judgeable
MiscalculationGiven a digit expression with + and * and Bob's answer, report whether it matches the precedence evaluation, the left-to-right evaluation, both, or neither.	Easy2	Simulation	No attempts yet	1s	256 MB	Judgeable
TriplesCount triples x<=y<=z<=m with x^j+y^j=z^j for each exponent j from 2 to n and print the total.	Easy2	Brute forceMath	No attempts yet	5s	256 MB	Judgeable
Turtle GraphicsSimulate a turtle that steps forward and turns on a 64 by 64 grid, then report its final cell and how many cells it visited more than once.	Easy2	SimulationArray	No attempts yet	1s	256 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
Joy of FlightAdd up the wind drift over k seconds and, if the remaining distance fits the speed limit, print the evenly paced flight positions.	Easy2	ImplementationSimulation+1	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
The return of the KingSplit the digit string into grades of 1 to 10 in the single valid way and print the average rounded to two decimals.	Easy2	StringGreedy	No attempts yet	1s	256 MB	Judgeable
EligibilityDecide each student contest status from study start year, birth year, and completed courses under four ordered rules.	Easy2	Implementation	No attempts yet	2s	256 MB	Judgeable
Professor Tardiness MaxFind the largest integer t with t plus t squared at most d for each given class length.	Easy2	Math	No attempts yet	1s	256 MB	Judgeable
Anniversary 1Starting from April 2, 2014 as day 1, add N-1 days with leap years and print the date as YYYY-MM-DD.	Easy2	SimulationImplementation	No attempts yet	1s	256 MB	Judgeable
Anniversary 2Given a start date as day 1 and a number N, print the date N minus 1 days later following the given leap year rules.	Easy2	SimulationImplementation	No attempts yet	1s	256 MB	Judgeable
TorusPrint 1 for each test case followed by the prescribed vertex order that visits every vertex of the toroidal lattice exactly once.	Easy2	Implementation	No attempts yet	1s	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
FilterThe program checks each Bloom filter against every queried user id and lists the files that may hold at least one of them.	Easy2	SimulationImplementation	No attempts yet	1s	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
Working HoursAdd signed hour and minute terms in a flexible format and print each total as H:MM.	Easy2	ImplementationString+1	No attempts yet	2s	256 MB	Judgeable
Urdu orthography verificationCheck whether each encoded Urdu letter uses the detached, initial, medial or final shape required by its position and the two special vowels.	Easy2	SimulationImplementation	No attempts yet	1s	256 MB	Judgeable
Mushrooms on Half a PizzaGiven mushroom counts on eight circular pizza slices, find the largest total on any four consecutive slices.	Easy2	Brute forceArray	No attempts yet	1s	32 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
Date in SeoulAdd nine hours to the given UTC date output and print the resulting Seoul calendar date as YYYY-MM-DD.	Easy2	Implementation	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
RövarspråketTranslate one lowercase word by expanding each consonant into three letters under the given vowel and consonant rules.	Easy2	ImplementationString	No attempts yet	1s	256 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
Reversing basketsApply M given interval reversals in order to baskets numbered 1 to N, then print the final order from the left.	Easy2	ArraySimulation	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
Comma Separated SumAdd all the natural numbers listed in the comma-separated string S.	Easy2	StringMath	No attempts yet	1s	256 MB	Judgeable
Four NumbersAdd the two numbers formed by writing B directly after A and D directly after C.	Easy2	ImplementationMath	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
International MeetingConvert a HH:MM meeting time from one UTC offset to N coworker offsets and print each local time of day.	Easy2	MathImplementation	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
SHA-256Print the SHA-256 hash of the given string as 64 lowercase hexadecimal digits.	Easy2	Implementation	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
Rocket height at last separationSimulate n rocket stages with the given thrust, mass, and burn time formulas and print the height when the last stage drops.	Easy2	SimulationMath	No attempts yet	1s	256 MB	Judgeable
Three Kangaroos 2Three kangaroos on integer points let an outer one jump between the other two, and each test case asks for the largest possible number of jumps.	Easy2	GreedyMath	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
Entrance ExaminationPick the cutoff n between nmin and nmax with a strict score split that maximizes the gap between the lowest passing and highest failing scores.	Easy2	ArrayImplementation	No attempts yet	1s	256 MB	Judgeable