Math and counting

Number theory, combinatorics, and geometry

Under construction

Still being built. Things may change

Total results13,152 problems

Professor Tardiness Max
Easy2
Math
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
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
Canteen Checkout
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
64 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
International Meeting
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 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
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
Binomial Coefficient 1
Easy2
Combinatorics, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Pythagorean Expectation
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
The Traveling Orienteerer
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Decode the Message
Easy2
String, Math+1
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Counting zeros
Easy2
Brute force, Math
No attempts yet
Time limit
3s
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
Choosing an Exam Set
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Minions' Master
Easy2
Implementation, Math
No attempts yet
Time limit
3s
Memory limit
256 MB
Judgeable
Hangul 2
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Initial, Medial, Final
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Compose a Hangul Syllable
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Margaret's Minute Minute Manipulation
Easy2
Implementation, Math
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
Price
Easy2
Implementation, Math
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
Time Limit Check
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Minimum Final Exam Score
Easy2
Math
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
Distribution
Easy2
Bit manipulation, Math+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Mr. Gorbachev, Tear Down This Wall!
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Three Origami Squares
Easy2
Geometry, Math
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Distribution in Metagonia
Easy2
Simulation, Math+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Mountain Biking
Easy2
Math, Simulation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Jump King Choi Junmin
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Base Conversion
Easy2
Math, 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
Scaling Recipes
Easy2
Implementation, Math
No attempts yet
Time limit
3s
Memory limit
256 MB
Judgeable
Dice Cup
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Turn Direction of Three Points
Easy2
Geometry
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
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
Octal, Decimal, Hexadecimal
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Promotion Counting
Easy2
Math
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Lazy Spelling Bee (Large)
Easy2
Combinatorics, String+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
gWheels (Small)
Easy2
Brute force, Math
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Hangul Initial Consonants
Easy2
Math, String+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Dreary Design (Small)
Easy2
Brute force, Math
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
Hedgemony (Small)
Easy2
Simulation, Math
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Dr. Spaceman's height algorithm
Easy2
Implementation, Math
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Quake Live (Small2)
Easy2
Brute force, Combinatorics
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Immigrate to the CTP principality
Easy2
Implementation, String+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Tojaengi's Walk to School
Easy2
Combinatorics, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Mini Fantasy War
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
XORXORXOR
Easy2
Bit manipulation, Math
No attempts yet
Time limit
0.2s
Memory limit
512 MB
Judgeable
Changyong's Clock
Easy2
Simulation, Math+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Lobby
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Three Sums
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Formula
Easy2
Geometry, Math+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Manhattan Taxi
Easy2
Implementation, Brute force+2
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Matches
Easy2
Geometry, Math+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Divisor Count
Easy2
Number theory, Brute force
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
The real Manhattan distance
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Collatz Sequence
Easy2
Simulation, Implementation+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Chessboard
Easy2
Array, Implementation+2
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Least Common Multiple
Easy2
Math, Number theory+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Quick Estimates
Easy2
String, Math+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Room Assignment
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Jumbled Compass
Easy2
Math, Implementation+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Math Contest
Easy2
Number theory, Math+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Four Arithmetic Operations
Easy2
Math, Implementation+2
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Anniversary Cake
Easy2
Geometry, Implementation+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Data Plan
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Cleaning Stations
Easy2
Implementation, Array+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Walking in time
Easy2
Brute force, Math+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Alarm Clock
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Dividing Nlogônia
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Pokemon GO
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
32 MB
Judgeable
Olympic Games
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Splitting into Two Teams
Easy2
Brute force, Math+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Unit Conversion
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Fuel
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Luhn Algorithm
Easy2
String, Implementation+2
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Telephone
Easy2
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Income tax
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Grades
Easy2
Array, Math+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Counting Sheep (Large)
Easy2
Math, Simulation+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Microwave
Easy2
Math, Implementation+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
One Hundred to Ten
Easy2
Math, Number theory+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Base 9
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Fibonacci-like Sequence
Easy2
Dynamic programming, Math+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Speed Limit
Easy2
Implementation, Math+1
No attempts yet
Time limit
5s
Memory limit
512 MB
Judgeable
Linear Equation
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Card Game Contest
Easy2
Math, Implementation+2
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
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
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
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
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
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
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
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
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
Binomial Coefficient 1Compute the binomial coefficient N choose K for given N up to 10 and K between 0 and N.	Easy2	CombinatoricsMath	No attempts yet	1s	256 MB	Judgeable
Pythagorean ExpectationAdd up each team's scored and allowed runs from the match records, apply the given formula, and print the largest and smallest values scaled by 1000.	Easy2	ImplementationMath	No attempts yet	1s	256 MB	Judgeable
The Traveling OrienteererGiven point coordinates and lists of courses, compute each course total Euclidean length rounded to the nearest integer.	Easy2	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Decode the MessageThe program decodes each word into one character from its letter values modulo 27.	Easy2	StringMath+1	No attempts yet	1s	256 MB	Judgeable
Counting zerosCount how many times the digit 0 appears when writing every integer from N to M.	Easy2	Brute forceMath	No attempts yet	3s	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
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
Minions' MasterFor each town, compute the average power and the percentage of residents above it, rounded to three decimals.	Easy2	ImplementationMath	No attempts yet	3s	256 MB	Judgeable
Hangul 2Given one Hangul syllable, compute its one-based index in the ordered list of 11172 syllables.	Easy2	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Initial, Medial, FinalDecompose one Hangul syllable into its initial, medial, and optional final jamo and print each on its own line.	Easy2	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Compose a Hangul SyllableJoin the given choseong, jungseong, and optional jongseong into a single Hangul syllable and print it.	Easy2	ImplementationMath	No attempts yet	1s	256 MB	Judgeable
Margaret's Minute Minute ManipulationDecode two binary-clock matrices into times, add them modulo 24 hours, and print the sum in the same matrix format.	Easy2	ImplementationMath	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
PriceApply the sticker discount and then the optional coupon to each price, round to cents, and apply the extra cash rounding for cash payments.	Easy2	ImplementationMath	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
Time Limit CheckFor each case, evaluate f(N) times T from the named complexity and print TLE when it exceeds 10^8 times L.	Easy2	MathImplementation	No attempts yet	2s	256 MB	Judgeable
Minimum Final Exam ScoreGiven project, paper, and midterm scores, compute the smallest integer final score from 0 to 100 that lifts the weighted grade to 90, or report impossible.	Easy2	Math	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
DistributionYou split the integers from 0 to 2^N - 1 into 2^K boxes of equal size with equal total popcount by pairing each x with its bitwise complement.	Easy2	Bit manipulationMath+1	No attempts yet	1s	512 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
Three Origami SquaresCut three equal axis-aligned squares from an h by w sheet and print the largest possible side length.	Easy2	GeometryMath	No attempts yet	2s	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
Mountain BikingFor each segment top, starting from rest, accumulate slope acceleration to compute the arrival speed at the foot.	Easy2	MathSimulation	No attempts yet	1s	256 MB	Judgeable
Jump King Choi JunminStarting from 0 with jumps of exactly k in either direction, count how many integers from a to b are multiples of k.	Easy2	Math	No attempts yet	1s	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
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
Scaling RecipesScale each recipe from the main ingredient weight and baker percentages, then print every scaled weight rounded half up to one decimal.	Easy2	ImplementationMath	No attempts yet	3s	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
Turn Direction of Three PointsGiven three points in order, print 1, -1, or 0 depending on whether the path turns left, turns right, or runs straight.	Easy2	Geometry	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
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
Octal, Decimal, HexadecimalConvert one integer given in octal, decimal, or hexadecimal notation to its decimal value.	Easy2	ImplementationMath	No attempts yet	1s	256 MB	Judgeable
Promotion CountingFrom the before and after head counts in the four divisions, recover the number promoted across each of the three boundaries.	Easy2	Math	No attempts yet	2s	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
gWheels (Small)Decide if any pedal gear, two distinct extra gears, and tire gear combine to each target ratio P/Q.	Easy2	Brute forceMath	No attempts yet	5s	512 MB	Judgeable
Hangul Initial ConsonantsPrint the initial consonant of each Hangul syllable in the given string in order.	Easy2	MathString+1	No attempts yet	1s	512 MB	Judgeable
Dreary Design (Small)Count RGB triples with each component in 0 to K whose largest and smallest values differ by at most V.	Easy2	Brute forceMath	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
Hedgemony (Small)Simulate a single left-to-right pass that trims each bush to the average of its current neighbors and output the final height of bush N-1.	Easy2	SimulationMath	No attempts yet	5s	512 MB	Judgeable
Dr. Spaceman's height algorithmCompute a child height range from both parents' heights and the child sex, then round both ends inward to whole inches.	Easy2	ImplementationMath	No attempts yet	5s	512 MB	Judgeable
Quake Live (Small2)Split the given players into two equal teams so the two skill totals differ as little as possible.	Easy2	Brute forceCombinatorics	No attempts yet	5s	512 MB	Judgeable
Immigrate to the CTP principalityConvert each item between uppercase letters and their alphabet positions (A=1 to Z=26), in the direction given by the mode character.	Easy2	ImplementationString+2	No attempts yet	1s	128 MB	Judgeable
Tojaengi's Walk to SchoolCount monotone lattice paths from (1,1) to (w,h) that pass through a given shop, modulo 1000007.	Easy2	CombinatoricsMath	No attempts yet	1s	128 MB	Judgeable
Mini Fantasy WarFor each character, add gear changes to the four base stats, clamp HP and MP to at least 1 and attack to at least 0, then print the weighted combat power.	Easy2	ImplementationMath	No attempts yet	1s	128 MB	Judgeable
XORXORXORXOR the value B into A exactly C times and print the result.	Easy2	Bit manipulationMath	No attempts yet	0.2s	512 MB	Judgeable
Changyong's ClockTrack a clock's time on a 24-hour dial, turning it forward or backward by c seconds and answering queries for the current time.	Easy2	SimulationMath+1	No attempts yet	1s	512 MB	Judgeable
LobbyGiven the seat counts of two parties, find how many independents must vote yes for a strict majority.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
Three SumsFor each N, print the sum of the first N positive integers, the first N odd numbers, and the first N even numbers.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
FormulaGiven triangle vertex coordinates and a measured incircle radius, compute the radius from the formula and print the percentage difference.	Easy2	GeometryMath+1	No attempts yet	2s	512 MB	Judgeable
Manhattan TaxiGiven your waiting intersection and up to 100 taxi positions on a 100x100 grid, print the coordinates of the taxi with the smallest Manhattan distance.	Easy2	ImplementationBrute force+2	No attempts yet	2s	512 MB	Judgeable
MatchesFor each match length, decide whether it fits in a W by H box, meaning its length is at most the diagonal sqrt(W^2+H^2).	Easy2	GeometryMath+1	No attempts yet	2s	512 MB	Judgeable
Divisor CountFor each of up to 10 values of n below 10000, print n and its divisor count.	Easy2	Number theoryBrute force	No attempts yet	2s	512 MB	Judgeable
The real Manhattan distanceGiven two points (x, y, floor), compute the walking distance: down from each floor, plus Manhattan street distance.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
Collatz SequenceStarting from n, repeatedly apply the Collatz rule (halve evens, 3n+1 for odds) and print every value from n down to 1 on one line.	Easy2	SimulationImplementation+1	No attempts yet	2s	512 MB	Judgeable
ChessboardPrint an N by M grid of asterisks and dots where the top left cell is an asterisk and adjacent cells always differ.	Easy2	ArrayImplementation+2	No attempts yet	2s	512 MB	Judgeable
Least Common MultipleGiven two integers below 100,000,000, print their least common multiple, which can exceed the 32-bit range.	Easy2	MathNumber theory+1	No attempts yet	2s	512 MB	Judgeable
Quick EstimatesRead N integers up to 10^100 and print the number of digits in each, counting 0 as one digit.	Easy2	StringMath+1	No attempts yet	2s	512 MB	Judgeable
Room AssignmentCount boys and girls per grade and sum the ceiling of each count divided by the room capacity K.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
Jumbled CompassGiven two compass directions from 0 to 359, print the signed rotation with the smallest magnitude that moves the needle from the first direction to the second, breaking ties toward clockwise.	Easy2	MathImplementation+1	No attempts yet	2s	512 MB	Judgeable
Math ContestGiven a huge decimal integer x, print YES if x is divisible by 9 and NO otherwise.	Easy2	Number theoryMath+1	No attempts yet	1s	512 MB	Judgeable
Four Arithmetic OperationsEach line gives an expression a op b = c with single-digit spacing, and you print correct or wrong answer depending on whether the arithmetic matches the claimed result.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
Anniversary CakeGiven a rectangle and two interior candles, output the specific cut described by a fixed rule that separates the candles.	Easy2	GeometryImplementation+1	No attempts yet	2s	256 MB	Judgeable
Data PlanTrack monthly data allowance that rolls over, subtract each month's usage, and report the megabytes available in month N+1.	Easy2	ImplementationMath	No attempts yet	1s	64 MB	Judgeable
Cleaning StationsGiven weights and a feature matrix, print the indices of the rows whose weighted sum is largest, in ascending order, for each of K data sets.	Easy2	ImplementationArray+1	No attempts yet	2s	512 MB	Judgeable
Walking in timeGiven three credit values, decide whether choosing some of them with signs (+ or -) sums to zero using at least one credit.	Easy2	Brute forceMath+1	No attempts yet	1s	512 MB	Judgeable
Alarm ClockFor each case, compute how many minutes pass from the current time until the alarm time, rolling over to the next day when needed.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
Dividing NlogôniaGiven a divider point, classify each house coordinate into one of four quadrants or as lying on a dividing line.	Easy2	ImplementationMath	No attempts yet	2s	512 MB	Judgeable
Pokemon GOFor each species, compute how many net 10-candy evolutions are possible, sum them, and find the species with the most evolutions.	Easy2	MathImplementation	No attempts yet	1s	32 MB	Judgeable
Olympic GamesFor each year, decide whether it is a summer Olympic year, and if so whether the games were held, cancelled by a war, or not yet assigned a city.	Easy2	ImplementationMath	No attempts yet	2s	512 MB	Judgeable
Splitting into Two TeamsGiven four sorted skill levels, split them into two pairs of two and print the smallest possible difference between the two pair sums.	Easy2	Brute forceMath+1	No attempts yet	2s	512 MB	Judgeable
Unit ConversionGiven x of unit A equals y of unit B, convert each listed amount to the other unit and print the result to six decimals.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
FuelConvert fuel consumption from miles per gallon to liters per 100 kilometers using the given conversion constants.	Easy2	MathImplementation	No attempts yet	1s	512 MB	Judgeable
Luhn AlgorithmGiven a sixteen-digit card number as a string, check whether it passes the Luhn checksum and print DA or NE.	Easy2	StringImplementation+2	No attempts yet	1s	512 MB	Judgeable
TelephoneFind the base between 2 and 10 whose representation of N has the fewest adjacent digit changes, breaking ties by the largest base.	Easy2	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
Income taxFor each income, subtract 0, 10 percent, or 20 percent tax depending on whether income is at most 1,000,000, at most 5,000,000, or larger.	Easy2	ImplementationMath	No attempts yet	2s	512 MB	Judgeable
GradesGiven a list of grades, compare the midpoint of the maximum and minimum against the overall average, and report whether they differ by less than 1.	Easy2	ArrayMath+1	No attempts yet	2s	512 MB	Judgeable
Counting Sheep (Large)For each N, find the first multiple of N that contains all ten digits, or report that no such multiple exists (only N = 0).	Easy2	MathSimulation+1	No attempts yet	5s	512 MB	Judgeable
MicrowaveGiven a start temperature below target, compute total heating time using per-degree rates for frozen and unfrozen states plus a fixed thawing time.	Easy2	MathImplementation+1	No attempts yet	2s	512 MB	Judgeable
One Hundred to TenParse a ratio written as n:m, divide both numbers by their greatest common divisor, and print the reduced ratio in the same format.	Easy2	MathNumber theory+1	No attempts yet	2s	512 MB	Judgeable
Base 9Convert a given decimal integer between 1 and 10000 into its base 9 representation.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
Fibonacci-like SequenceGiven n up to 116, compute the n-th term of the recurrence f(n) = f(n-1) + f(n-3) with f(1)=f(2)=f(3)=1.	Easy2	Dynamic programmingMath+1	No attempts yet	2s	512 MB	Judgeable
Speed LimitFor each log entry, multiply the speed by the time since the previous entry, sum these products, and print the total distance in miles.	Easy2	ImplementationMath+1	No attempts yet	5s	512 MB	Judgeable
Linear EquationFor each linear equation ax + b = c, decide whether it has no, one, or infinitely many solutions and print the root truncated to six decimals.	Easy2	MathImplementation	No attempts yet	2s	512 MB	Judgeable
Card Game ContestFor each of N games, Meiji has A_i decks, or gets one basic deck if A_i is 0. Count the number of distinct ways to enter, modulo M.	Easy2	MathImplementation+2	No attempts yet	1s	256 MB	Judgeable