Math and counting

Number theory, combinatorics, and geometry

Under construction

Still being built. Things may change

Total results13,153 problems

Are We Stopping Again?
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Curling
Easy2
Implementation, Math
No attempts yet
Time limit
20s
Memory limit
1024 MB
Judgeable
Continuous?
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Limit of a Sequence Ratio
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Quadratics
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Ornaments
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Zero
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Time Limits
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Playtime
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Farm
Easy2
Math, Implementation
No attempts yet
Time limit
0.15s
Memory limit
1024 MB
Judgeable
Non Classical Problem
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
New Time
Easy2
Brute force, Math+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Lamps
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Pyramid Construction
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Refrigerator Transport
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Bovine Birthday
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
ISBN
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Making Change
Easy2
Greedy, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Special Chicken Distribution
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Meeting Near the Fountain
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Robinson Crusoe
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Ladder of Numbers
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Colorful Diagonals
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
FHL Final
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Linear Regression Is Too Easy 1
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Estimathon
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Factorial 3
Easy2
Math, Implementation
No attempts yet
Time limit
4s
Memory limit
1024 MB
Judgeable
Honeycomb 2
Easy2
Math, Implementation
No attempts yet
Time limit
0.25s
Memory limit
1024 MB
Judgeable
Non-Prime Number
Easy2
Math, Implementation
No attempts yet
Time limit
0.5s
Memory limit
1024 MB
Judgeable
One and Two
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Blueberry Waffle
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Clothes Hangers
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Shooting Bet
Easy2
Bit manipulation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
2D Coordinate Conversion
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Lemon Picking
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Junseok's Candy Shopping
Easy2
Greedy, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Bishoujo Computer Parubitto-chan
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Flower Festival
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Hungry (Easy)
Easy2
Bit manipulation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
10!
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Slip~Hit! Hit~Slip!
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Planets of Two Dimensions
Easy2
Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Frankenstein and the Flasks
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Piltover and Zaun
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Lunch Break
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
How to Feed the Dragon
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Gravity Falls Diary
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Journey Through Worlds
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Amulet Split
Easy2
Math, Geometry
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Final Grade
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Immersion into the Animus
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Spaceship
Easy2
Array, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Lucky Tickets
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
BB-8 Repair
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Almost Favorite Numbers
Easy2
Math, Implementation
No attempts yet
Time limit
0.5s
Memory limit
1024 MB
Judgeable
Time to Rest
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Non-Prime 2
Easy2
Implementation, Math
No attempts yet
Time limit
0.5s
Memory limit
1024 MB
Judgeable
Vampire Power
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Antelope Gnu
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Alex and the Steak
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Treasure Map
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Clone War
Easy2
Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Chess
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
House Plates
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Gasoline Production
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Takeoff
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Hive
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Fraction Magic
Easy2
Brute force, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Map
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Generalized Twin Primes
Easy2
Number theory, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Two Formats
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Triangle
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Curling
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Radio-Controlled Car Race
Easy2
Brute force, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Time Standards
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
So, how many problems have you solved?
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Brsil Comet
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
What Is in the Apple Box? Cash?
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Where Is My Package
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Minimum Grade
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Find the Hanyang Student ID!
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Average scores
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Subtracting fractions
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Cheeseburger Making
Easy2
Greedy, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Painting the Fence
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Cookie Piles
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Distinct Digits
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Age Expression
Easy2
Brute force, Math
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
Cargo Ship
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
King's Keep
Easy2
Brute force, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Advance to Taoyuan Regional
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Traffic Light
Easy2
Math, Simulation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Target
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Floor Number
Easy2
Implementation, Math
No attempts yet
Time limit
0.2s
Memory limit
1024 MB
Judgeable
Why Hoban-woo Was Late for School 1
Easy2
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Cornhusker
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Pique Esconde
Easy2
Implementation, Math
No attempts yet
Time limit
0.5s
Memory limit
1024 MB
Judgeable
Lottery Failure
Easy2
Math, Implementation
No attempts yet
Time limit
0.5s
Memory limit
1024 MB
Judgeable
Seating Arrangement
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Welcome Kit
Easy2
Math, Implementation
No attempts yet
Time limit
0.1s
Memory limit
1024 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
Are We Stopping Again?Given the trip length and the gas and food intervals in miles, count the stops made before the destination, with a shared mile counted once.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
CurlingCount each team's stones that touch the house and are closer to the center than every opposing stone that also touches it.	Easy2	ImplementationMath	No attempts yet	20s	1024 MB	Judgeable
Continuous?Given two linear pieces split at x=k, determine whether the function is continuous at k, and print f(k) if it is.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Limit of a Sequence RatioGiven a_1, a_2 and the recurrence a_i = ba_(i-1) + ca_(i-2), find the limit of a_n / a_(n-1) as n grows without bound.	Easy2	Math	No attempts yet	1s	1024 MB	Judgeable
QuadraticsFor each data set, read the coefficients a, b, c of a quadratic equation and print both real roots rounded to the thousandths place.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
OrnamentsGiven the number of layers, find the total ornaments in a triangular pyramid where layer k holds k(k+1)/2 balls.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
ZeroGiven a zero-free integer k, find the next positive integer after k that also contains no zero digit.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Time LimitsFor each dataset, find the smallest whole-second time limit that is at least s times the slowest model solution's time in milliseconds.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
PlaytimeConverts each game's minutes played into years (365 days), days, hours, and minutes, printing only the units greater than 0.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
FarmGiven the total heads X and legs Y of hens (2 legs each) and cows (4 legs each), find how many hens and cows there are.	Easy2	MathImplementation	No attempts yet	0.15s	1024 MB	Judgeable
Non Classical ProblemGiven N fractions a_i/b_i, find the minimum, the maximum, and the sum of the values.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
New TimeGiven the clock's time and the correct time, find the fewest presses of a +1 minute button and a +1 hour button needed to match them.	Easy2	Brute forceMath+1	No attempts yet	2s	1024 MB	Judgeable
LampsGiven the daily hours a lamp is on and the electricity price, find the first day the low-energy lamp's total cost drops below the incandescent bulb's.	Easy2	SimulationMath	No attempts yet	1s	1024 MB	Judgeable
Pyramid ConstructionGiven N blocks, find the largest height h whose layers 1^2 + 3^2 + ... + (2h-1)^2 use at most N blocks.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Refrigerator TransportGiven two cars with a per-trip cost and a capacity each, find the trip counts for each car that move n refrigerators at the lowest total cost.	Easy2	Brute forceMath	No attempts yet	1s	1024 MB	Judgeable
Bovine BirthdayGiven a date from 1800 or later, print its day of the week, using January 1, 1900 as a Monday and the Gregorian leap year rules.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
ISBNGiven a 10-character ISBN with one '?', find the digit (0 to 9 or X) that makes the weighted sum divisible by 11, or print -1 if none does.	Easy2	Brute forceMath	No attempts yet	1s	1024 MB	Judgeable
Making ChangeGiven a purchase price P in cents, output the fewest 25, 10, 5, and 1 cent coins that make change for one dollar.	Easy2	GreedyMath	No attempts yet	1s	1024 MB	Judgeable
Special Chicken DistributionGiven N pieces of each of three chicken kinds and soldier preference counts A, B, C, find the maximum number of soldiers who get their preferred chicken.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Meeting Near the FountainGiven the total distance, park entrance distance, and two scooter speeds, find how many minutes late Kira arrives (rounded up), or 0 if she is on time.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Robinson CrusoeGiven day n, print the wall record where each complete group of five days becomes a V and the leftover days appear as I.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Ladder of NumbersNumbers are written in a staircase with row r holding r numbers, and only the first k of each row remain; print rows a through b.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Colorful DiagonalsGiven n, the task prints an n by n grid where each cell's letter depends on its distance to the nearest diagonal, cycling from a to z.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
FHL FinalGiven the results of a best-of-n series of k games, find the earliest game after which the winner is known and mark which games were predictable.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Linear Regression Is Too Easy 1Given n points and an intercept b, find the slope a that makes the sum of (a*x_i + b - y_i) closest to 0, or print EZPZ if several slopes tie.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
EstimathonGiven the chair count of each colour, decide whether every colour can fill whole tables of four chairs so that exactly n tables are filled.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Factorial 3Given an integer N from 0 to 100,000, print the exact value of N! as a big integer.	Easy2	MathImplementation	No attempts yet	4s	1024 MB	Judgeable
Honeycomb 2Given room number N in a hexagonal honeycomb numbered outward from center room 1, find how many rooms lie on the shortest path from room 1 to room N, counting both ends.	Easy2	MathImplementation	No attempts yet	0.25s	1024 MB	Judgeable
Non-Prime NumberGiven N, print any integer at least N that is not prime. The answer must be at most 10^9.	Easy2	MathImplementation	No attempts yet	0.5s	1024 MB	Judgeable
One and TwoGiven a sequence of 1s and 2s, find the smallest split point k where the product of the prefix equals the product of the suffix, or report -1.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Blueberry WaffleGiven a pan that turns 180 degrees every r seconds and stops after f seconds, decide if the blueberry side faces up once the pan levels out.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Clothes HangersGiven each hanger's type and the counts of tops and bottoms, decide whether all clothes can be hung and print one valid assignment if so.	Easy2	ImplementationMath	No attempts yet	1s	256 MB	Judgeable
Shooting BetGiven the shoot totals of A and B, find C's total, which is the bitwise XOR of the two scores.	Easy2	Bit manipulationMath	No attempts yet	1s	1024 MB	Judgeable
2D Coordinate ConversionFor each test case, convert a point between Cartesian (x, y) and polar (r, theta) coordinates, with theta in the range [0, 2pi).	Easy2	MathImplementation	No attempts yet	1s	512 MB	Judgeable
Lemon PickingSeongwoo picks lemons from one tree and walks home, losing one lemon per move. Find the maximum number of lemons he can carry home.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Junseok's Candy ShoppingGiven N bags of candy, find the largest even total you can get by choosing any subset of bags, or 0 if none exists.	Easy2	GreedyMath	No attempts yet	1s	1024 MB	Judgeable
Bishoujo Computer Parubitto-chanGiven an octal expression A+B, A-B, A*B, or A/B, print the result in octal, using floor division, or print invalid when it cannot be computed.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Flower FestivalGiven each car's position and constant speed on a road of length f, find the number of the car that reaches the end first.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Hungry (Easy)For each positive integer m, print the pair x and y (x <= y) where 2^x + 2^y = m.	Easy2	Bit manipulationMath	No attempts yet	1s	1024 MB	Judgeable
10!Given N from 10 to 17, print how many weeks N! seconds equals, using 6 weeks as 3628800 seconds.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Slip~Hit! Hit~Slip!Given N moves with attack and dodge gains and real multipliers K_i, find the maximum final adrenaline when every move starts with the same action type.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Planets of Two DimensionsGiven n planets in dimension X and m in dimension Y, find the longest trip that visits no planet twice and never visits two same-dimension planets in a row.	Easy2	Math	No attempts yet	1s	1024 MB	Judgeable
Frankenstein and the FlasksGiven the classes of two reagents (N, Z, Q, R) and an operation (+, -, *), find the smallest class that contains every possible result.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Piltover and ZaunGiven current statuses x1 and x2 and n years, decide whether Piltover gaining and Zaun losing the same yearly amounts can produce them.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Lunch BreakFor each restaurant, add the distance from the hideout, the eating time, and the distance to the destination, then output the smallest total.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
How to Feed the DragonGiven the feeding times for today and tomorrow, print the gap between them as HH:MM, with equal times giving 24:00.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Gravity Falls DiaryGiven page size, letter size, and letter count, find how many pages the diary needs, or -1 if no letter fits on a page.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Journey Through WorldsCount the repdigit numbers (such as 11, 222, or 9999) between l and r, where l and r can be as large as 10^18.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Amulet SplitGiven a right triangle with legs X and Y on the axes, find the vertical line x that splits its area into two equal halves.	Easy2	MathGeometry	No attempts yet	2s	1024 MB	Judgeable
Final GradeGiven a string of letter grades (A is best, Z worst), output the mean rounded in the student's favor, capped at one step better than the worst grade.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Immersion into the AnimusGiven n and k, count the unordered pairs of distinct natural numbers, each at most n, that sum to k.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
SpaceshipGiven n enemy strengths, find the boss, which equals the sum of the others, and print the order that destroys it last.	Easy2	ArrayMath	No attempts yet	2s	1024 MB	Judgeable
Lucky TicketsCount the tickets with all-equal digits in the range from N-M to N, where N is Dim Dimych's ticket and M is the number of earlier passengers.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
BB-8 RepairGiven a plate of height a and width b and a hole of height h and width w, find the fewest plates needed to cover the hole.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Almost Favorite NumbersCount the integers from 1 to m whose decimal representation ends with the digits of n.	Easy2	MathImplementation	No attempts yet	0.5s	1024 MB	Judgeable
Time to RestGiven n penguin groups with start a_i, step b_i, and size c_i, find the total count of penguins whose path passes through point k.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Non-Prime 2Given a prime k with 0 < k < 1 and up to eight decimal digits, output a fraction p/q with p and q at most 10^9 that approximates k.	Easy2	ImplementationMath	No attempts yet	0.5s	1024 MB	Judgeable
Vampire PowerEdward picks a sign for each vampire's power so that only the total is revealed, and the task is to query and output the answer in an interactive protocol.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Antelope GnuGiven a start and a target intersection in a grid of streets, count the turns needed when the car may only turn left or make U-turns.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Alex and the SteakGiven k presses of a microwave button, where each group of five presses adds 30, 60, 90 and so on seconds per press, find the total heating time.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Treasure MapEach clue bounds the treasure with a strict inequality, so count the lattice points inside the resulting rectangle, or print Infinity if some side is open.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Clone WarCount the pairs of clones whose coordinates have different parity, since the required distances force each side to match the parity of its coordinates.	Easy2	Math	No attempts yet	2s	1024 MB	Judgeable
ChessTigra moves two squares straight or one square diagonally on an 8x8 board; decide whether it can reach the Slonopotam's square.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
House PlatesGiven house numbers on each street, find the total cost of plates when each binary 0 digit costs a rubles and each binary 1 digit costs b rubles.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Gasoline ProductionGiven n bids with line cost A, per-ton cost B, and price C, find the bid index that minimizes A/(C-B), with ties going to the smallest index.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
TakeoffGiven the plane mass, passenger masses, and the fuel ratio alpha, find the minimum fuel mass for takeoff or report Impossible.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
HiveGiven the size n of a hexagonal hive built from rings around one center cell, print the total number of cells.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Fraction MagicGiven fractions p1/q1 and p2/q2 and the denominator b of a/b, find the smallest integer numerator a with p1/q1 < a/b < p2/q2, or -1 if none exists.	Easy2	Brute forceMath	No attempts yet	2s	1024 MB	Judgeable
MapGiven n scraps and k parts per tear, find how many seconds t Vasya tore the map, or print -1 if no such t exists.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Generalized Twin PrimesGiven n and k, count the prime pairs (p, q) with q - p = k and q at most n. The bounds are at most 10^4, so a sieve suffices.	Easy2	Number theoryMath	No attempts yet	2s	1024 MB	Judgeable
Two FormatsGiven N as read on a little-endian device after a big-endian transfer, recover the original number M by reversing its three bytes.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
TriangleGiven the three side midpoints of a hidden triangle, print the coordinates of its three vertices.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
CurlingFor each end, find the team with the stone closest to the origin and count its stones closer than every opposing stone, then print the totals as a:b.	Easy2	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Radio-Controlled Car RaceGiven each car's head start and constant speed, find the earliest time at which two cars are at the same distance from the start.	Easy2	Brute forceMath	No attempts yet	2s	1024 MB	Judgeable
Time StandardsGiven two time standards that set the hours, minutes, and seconds per unit, convert a moment from the first standard to the same moment in the second.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
So, how many problems have you solved?Given N, M, and K, find the minimum and maximum problems solved so far when reaching a total of N needs at least M per day for at least K days.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Brsil CometGiven a date on a 360-day calendar and a period N, the task is to find the next date after today that is a multiple of N days later.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
What Is in the Apple Box? Cash?Given apple and pear juice boxes with their sizes, compute the total mass of the boxes and the market value of the apples inside.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Where Is My PackageGiven the shift start and end times, the count of earlier packages, and the minutes per delivery, find the day offset and clock time when Bsil's package arrives.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Minimum GradeGiven the grades of N-1 courses and a target GPA, find the lowest grade for the last course that makes the truncated semester average exceed the target.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Find the Hanyang Student ID!Given up to five Suneung standard scores, compute the Hanyang student ID from a fixed formula of score differences and products.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Average scoresGiven each playthrough's player and points, print M, J, or V for whose average score is higher, or whether the averages are equal.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Subtracting fractionsSubtracts the fraction c/d from a/b read from a file, then prints the reduced result both as a plain fraction and as a formatted mixed number.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Cheeseburger MakingGiven A patties and B cheese slices, find the largest cheeseburger where the patty count is exactly one more than the cheese count.	Easy2	GreedyMath	No attempts yet	1s	1024 MB	Judgeable
Painting the FenceGiven scrape and paint times per post and Tomas's head start, find the total minutes Barbora spends waiting for posts to be scraped.	Easy2	SimulationMath	No attempts yet	1s	1024 MB	Judgeable
Cookie PilesGiven N cookie piles whose heights start at A and rise by D per pile, find the total number of cookies.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Distinct DigitsGiven l and r up to 10^5, the task finds any number in the range whose digits are all different, or reports -1.	Easy2	Brute forceMath	No attempts yet	1s	1024 MB	Judgeable
Age ExpressionGiven Dr. O's age N and the ages A and K of his granddaughters, decide whether positive integers a and k satisfy aA + kK = N.	Easy2	Brute forceMath	No attempts yet	5s	1024 MB	Judgeable
Cargo ShipGiven a deck of a by b meters and cars of c by d meters, decide whether all n cars fit, and if not, find the maximum that do.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
King's KeepGiven k points, find the minimum over all points of the average Euclidean distance from that point to the other k-1 points.	Easy2	Brute forceMath	No attempts yet	1s	1024 MB	Judgeable
Advance to Taoyuan RegionalGiven a 2023 date, the task is to print TOO LATE if it falls less than 35 days before October 21, 2023, and GOOD otherwise.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Traffic LightGiven drive time M, lap time N, and red interval T, find the laps completed before Mantas first hits a red light, or report that he never stops.	Easy2	MathSimulation	No attempts yet	1s	1024 MB	Judgeable
TargetGiven a window grid, a target grid, and a wind offset, find the smallest TX+TY over target cells the arrow can land on, or report NEPATAIKYS if none exists.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Floor NumberGiven a floor number N and a digit count L, print an L-digit number with no leading zero whose repeated digit-product reduces to N.	Easy2	ImplementationMath	No attempts yet	0.2s	1024 MB	Judgeable
Why Hoban-woo Was Late for School 1Given four stats and a target N, find the fewest +1 blessings needed so the average of the four stats is at least N.	Easy2	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
CornhuskerGiven five ears' kernel rows and lengths, plus the ear count and kernel weight factor, the task prints the integer bushels per acre estimate.	Easy2	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Pique EscondeGiven n children, the searcher m, and the n-2 children already found, output the number of the one child still missing.	Easy2	ImplementationMath	No attempts yet	0.5s	1024 MB	Judgeable
Lottery FailureFor each integer of up to 30 digits until 0, print PREMIADO if it is a multiple of 42, otherwise print TENTE NOVAMENTE.	Easy2	MathImplementation	No attempts yet	0.5s	1024 MB	Judgeable
Seating ArrangementGiven the head counts of K schools, find the largest room size when all students are split as evenly as possible across M rooms.	Easy2	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Welcome KitFind the fewest T-shirt bundles of size T that cover each size's requests, and the maximum pen bundles of size P with the leftover single pens.	Easy2	MathImplementation	No attempts yet	0.1s	1024 MB	Judgeable