Math and counting

Number theory, combinatorics, and geometry

Under construction

Still being built. Things may change

Total results13,152 problems

November (11月)
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Metronome
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Factorial 2
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Yes or No Vote
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
CVE: Life is Way Too Short
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Chocolate Bar
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Alloy Coin
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Public transit at the Information Science Building
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
HI-ARC=?
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Indicator
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Sum of Cubes
Easy1
Implementation, Math
No attempts yet
Time limit
0.25s
Memory limit
1024 MB
Judgeable
Movie Buffs
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Kings
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Expression
Easy1
Array, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Christmas Lottery
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Busil wants to be friends
Easy1
Intervals, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Triangle
Easy1
Math, Implementation
No attempts yet
Time limit
0.1s
Memory limit
1024 MB
Judgeable
Arno's Sleep Schedule
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Jõululaul
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Ramen Formula
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Junyeong's Grade
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Position Zero
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Finding the Price of Sweet Corn
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Counting Banknotes
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Hidden Sum
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Sum of Counts
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
An Easy-Peasy Problem
Easy1
Implementation, Math
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
Lucky 7
Easy1
Math, String+1
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
Java Warriors
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
gahui and sousenkyo 3
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Last Factorial Digit
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Hunting Dog
Easy1
Math, Simulation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Fruit
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Sum Checker
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Drops Packing
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Tuesday
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Minutes
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Digit
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Adding Trouble
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Special Eggplant
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
SciComLove (2024)
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Unit Test
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Fence Construction
Easy1
Implementation, Math
No attempts yet
Time limit
0.1s
Memory limit
1024 MB
Judgeable
CodeMaster 2024
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
A + B
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Farmers' Market
Easy1
Math, Implementation
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
Basketball Score
Easy1
Implementation, Math
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
Christmas Tree Adapter
Easy1
Math, Implementation
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
Conveyor Belt Sushi
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Attention to the Meeting
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Janggi
Easy1
Implementation, Math
No attempts yet
Time limit
0.3s
Memory limit
1024 MB
Judgeable
Linear Expression
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Gahui and Seoul Subway Line 2
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
UOS String
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
AI Leading University
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Alea Iacta Est
Easy1
Implementation, Math
No attempts yet
Time limit
0.5s
Memory limit
1024 MB
Judgeable
Pencils 2
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
2048 MB
Judgeable
Walking
Easy1
Simulation, Math
No attempts yet
Time limit
2s
Memory limit
2048 MB
Judgeable
Railway Trip 3
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
2048 MB
Judgeable
Money On Me
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
2048 MB
Judgeable
Blackjack
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
2048 MB
Judgeable
Micromasters
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
2048 MB
Judgeable
Hansu Numbers
Easy2
Implementation, Brute force+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Make It Divisible
Easy2
Brute force, Math+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Octal to Binary
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Sign of Integer Sums
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Mobile Phone Bill
Easy2
Simulation, Implementation+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
House Number Sign
Easy2
Implementation, String+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Easy Sequence Sum
Easy2
Math, Simulation+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
TV Size
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Year Progress Bar
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Actual Disk Space
Easy2
Math, Implementation+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Reversed Addition
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
24-Hour Mission
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Time Machine
Easy2
Combinatorics, Brute force+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Room Number
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Adjusted Average
Easy2
Array, Math+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Manhattan Distance on a Four-Row Number Board
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Chicken Coupons
Easy2
Math, Simulation+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Growth Points
Easy2
Simulation, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Break-Even Point
Easy2
Math, Implementation
No attempts yet
Time limit
0.35s
Memory limit
128 MB
Judgeable
Next Term in a Sequence
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Fraction Sum
Easy2
Math, Number theory+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Concatenating Numbers 1
Easy2
Math, Implementation
No attempts yet
Time limit
0.15s
Memory limit
128 MB
Judgeable
Numbers With Equal Remainder and Quotient
Easy2
Math
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Octopus Numbers
Easy2
String, Math+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Good License Plates
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Fourth Point
Easy2
Geometry, Math+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Year 2007
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Least Common Multiple
Easy2
Math, Number theory
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Counting Pentagon Points
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Perfect Squares
Easy2
Math, Brute force+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Counting Primes
Easy2
Math, Brute force
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Plugs
Easy2
Math, Greedy+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Self-Replicating Number
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Day of the Year
Easy2
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Number Game
Easy2
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Prime Word
Easy2
String, Math+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Restoring Numbers
Easy2
Math, Number theory+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Sum of Consecutive Integers
Easy2
Math, Implementation
No attempts yet
Time limit
0.25s
Memory limit
128 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
November (11月)Given day A of November 2022 and a number of weeks B, print 1 if the day B weeks later is still in November, otherwise 0.	Easy1	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
MetronomeGiven a tick count n, the task is to compute how many key revolutions give n ticks, at four ticks per revolution, printed to two decimals.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Factorial 2Given an integer N from 0 to 20, the task is to print N factorial.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Yes or No VoteGiven N votes coded as 1, -1, or 0, decide whether the vote is APPROVED, REJECTED, or INVALID when abstentions are at least half.	Easy1	ImplementationMath	No attempts yet	2s	512 MB	Judgeable
CVE: Life is Way Too ShortGiven n up to 100,000, the task is to print 2 raised to the power n as a full decimal number.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Chocolate BarGiven N coins of 100 won each, the task is to check whether the total value is at least the price M and print Yes or No.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Alloy CoinGiven two metal densities and the mass percentage of the denser metal, the task is to compute the density of the resulting alloy coin.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Public transit at the Information Science BuildingGiven walking time N, bus arrival A, and train arrival B, decide whether the bus or the subway can be boarded first, or if they tie.	Easy1	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
HI-ARC=?The task reads five integers H, I, A, R, C and prints H times I minus A times R times C.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
IndicatorGiven a cyclic counter from 1 to m, find the fewest button presses that move it from a to b.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Sum of CubesGiven N, the task prints the sum 1 to N, its square, and the sum of cubes 1 to N.	Easy1	ImplementationMath	No attempts yet	0.25s	1024 MB	Judgeable
Movie BuffsCompare total video minutes for two viewers, where a trailer is 3 minutes, an episode is 20 minutes, and a film is 120 minutes, and report who watched more or a draw.	Easy1	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
KingsGiven three armies' battalion counts and sizes, the task is to print the name or names of the army with the most warriors.	Easy1	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
ExpressionGiven n cards with integers, find the smallest index j where a_j equals the sum of all the other cards.	Easy1	ArrayMath	No attempts yet	2s	1024 MB	Judgeable
Christmas LotteryFor each receipt, count the full A-ruble parts of its amount, then print the total of those counts across all n receipts.	Easy1	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Busil wants to be friendsCount how many values from A to B differ from K by at most X, and print IMPOSSIBLE if no value qualifies.	Easy1	IntervalsMath	No attempts yet	1s	1024 MB	Judgeable
TriangleGiven base W and height H, the task asks for the triangle's area printed with one decimal place.	Easy1	MathImplementation	No attempts yet	0.1s	1024 MB	Judgeable
Arno's Sleep ScheduleGiven the hour Arno goes to sleep and the hour his alarm rings, print how many hours he sleeps, wrapping past midnight when needed.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
JõululaulGiven N, print for each k from 1 to N the total count of gift A_k, which is k times (N minus k plus 1).	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Ramen FormulaGiven N cases of coefficients A, B and pack count X, print W = A(X-1)+B for each case.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Junyeong's GradeGiven each rank G_i among N students, the task maps the integer part of G_i times 100 divided by N to a grade from 1 to 9 for each of K subjects.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Position ZeroCount the vertical lines x = T_i that pass strictly inside a circle with center (X, Y) and radius R, and count those that only touch its boundary.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Finding the Price of Sweet CornGiven the price B that includes a 10% value-added tax, find the price A before tax. B is a multiple of 11, so A is B divided by 11, times 10.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Counting BanknotesGiven N banknote widths and heights, the task is to sum the value of each note, where width identifies the denomination.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Hidden SumGiven ten integers, print the one that equals the sum of the other nine.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Sum of CountsGiven n and m, find the sum of f(n, m, i) over i from 0 to n+m, where f counts pairs (x, y) with x+y=i in the box 0 to n by 0 to m.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
An Easy-Peasy ProblemGiven solve counts at the halfway point and at the end of a contest, print E if at least half of the final solvers had solved it by the first half, otherwise H.	Easy1	ImplementationMath	No attempts yet	5s	1024 MB	Judgeable
Lucky 7Given an integer, the task is to print 0, 1, 2, or 3 depending on whether the number contains digit 7 and whether it is divisible by 7.	Easy1	MathString+1	No attempts yet	5s	1024 MB	Judgeable
Java WarriorsGiven a team count n (at most 20), the task is to output n times the 4000 dollar registration fee.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
gahui and sousenkyo 3Given preliminary votes p and final votes r, print the character's type (weak, normal, strong, or very strong) based on the ratio p/r.	Easy1	ImplementationMath	No attempts yet	1s	512 MB	Judgeable
Last Factorial DigitGiven up to 10 values of N (N at most 10), print the last decimal digit of N! for each.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Hunting DogGiven the starting gap N and per-jump distances M (rabbit) and K (dog), the task is to find how many jumps the dog needs to close the gap.	Easy1	MathSimulation	No attempts yet	1s	1024 MB	Judgeable
FruitRead two integers X and Y, then print X + Y + 3, the total count of apples, mandarin oranges, and three bananas.	Easy1	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Sum CheckerGiven three positive integers, the task is to check whether one of them equals the sum of the other two and print 1 or 0.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Drops PackingGiven a price per drop, a count of drops, and a bag price, the task asks for the total amount paid, which is A times B plus C.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
TuesdayGiven X, print 1 if the day X days after a Sunday is a Tuesday, otherwise print 0.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
MinutesGiven hours H and minutes M, the task is to print the total number of minutes, H * 60 + M.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
DigitGiven two integers A and B, the task is to count the decimal digits of their sum.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Adding TroubleGiven three integers A, B, and C, the task is to check whether A + B equals C and print correct! or wrong! accordingly.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Special EggplantGiven beef per roll N, total beef M, and eggplant per roll K, the task is to compute total eggplant grams needed as (M/N)*K.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
SciComLove (2024)Given N, print the string SciComLove reversed N times: the original if N is even, or evoLmoCciS if N is odd.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Unit TestGiven the two top numbers and the bottom number of a circle with one blank (0), print the positive integer for the blank so the top pair sums to the bottom number squared.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Fence ConstructionGiven N rectangles added one at a time, print the perimeter of the bounding rectangle of all buildings so far after each addition.	Easy1	ImplementationMath	No attempts yet	0.1s	1024 MB	Judgeable
CodeMaster 2024Given n, m, and k, print the total of Doohoon's m installs on each of k computers plus Teacher Cha's m installs on the laptop.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
A + BRead two integers A and B from 0 to 100 and print their sum.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Farmers' MarketGiven apples per bag, number of bags, and the price per dozen, the task is to compute the cost when partial dozens are charged as full dozens.	Easy1	MathImplementation	No attempts yet	5s	1024 MB	Judgeable
Basketball ScoreGiven the free throw, 2 pointer, and 3 pointer counts for two teams, the task is to print 1, 2, or 0 for the team with more points or a tie.	Easy1	ImplementationMath	No attempts yet	5s	1024 MB	Judgeable
Christmas Tree AdapterGiven a tree's ampere and an adapter's watt and volt, the task is to print 1 if the adapter's ampere (watt divided by volt) is at least the tree's ampere, otherwise 0.	Easy1	MathImplementation	No attempts yet	5s	1024 MB	Judgeable
Conveyor Belt SushiGiven counts of red, green, and blue plates, the task is to compute the total cost at $3, $4, and $5 per plate.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Attention to the MeetingGiven N speeches of equal length with 1-minute gaps between them and a K-minute limit, find the longest speech length that keeps the meeting within K.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
JanggiGiven each side's remaining janggi pieces, decide which player has the higher score, with Han receiving a 1.5-point bonus, and print that player's name.	Easy1	ImplementationMath	No attempts yet	0.3s	1024 MB	Judgeable
Linear ExpressionGiven integers A and B, the task prints the linear expression Ax+B in standard form, dropping zero terms and coefficients of 1.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Gahui and Seoul Subway Line 2For each query, the task compares when inner and outer circle trains leaving station a arrive at station b on the circular Line 2 and reports the faster direction.	Easy1	ImplementationMath	No attempts yet	1s	512 MB	Judgeable
UOS StringGiven a 1-based position x, print the character at that position in the infinite repeating string UOSUOS..., which follows from x modulo 3.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
AI Leading UniversityGiven a year N between 2024 and 9999, the task is to print how many years have passed since 2024, which is N minus 2024.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Alea Iacta EstGiven two dice rolls for zuodong and then jiadong among four seated players, the task is to print the number of the player who becomes zhendong.	Easy1	ImplementationMath	No attempts yet	0.5s	1024 MB	Judgeable
Pencils 2Given A yen, find how many pencils costing 5 yen each JOI can buy, which is A divided by 5 rounded down.	Easy1	MathImplementation	No attempts yet	2s	2048 MB	Judgeable
WalkingGiven X, compute the net forward distance after X alternating moves of 3 m forward (A) and 2 m backward (B), starting with A.	Easy1	SimulationMath	No attempts yet	2s	2048 MB	Judgeable
Railway Trip 3Given a trip length Q km, a rate A yen per km for the first P km, and B yen per km after that, the task is to print the total fare.	Easy1	ImplementationMath	No attempts yet	2s	2048 MB	Judgeable
Money On MeGiven counts of 1000-yen and 10000-yen bills, the task is to print the total amount of money in yen.	Easy1	ImplementationMath	No attempts yet	2s	2048 MB	Judgeable
BlackjackGiven three integers from 1 to 13, the task prints 1 if their sum is 21 or less, and 0 otherwise.	Easy1	ImplementationMath	No attempts yet	2s	2048 MB	Judgeable
MicromastersGiven the number of students Mina referred, each adding a 10% discount, find how many courses she can take for free.	Easy1	MathImplementation	No attempts yet	1s	2048 MB	Judgeable
Hansu NumbersCount integers from 1 to N (N up to 1000) whose digits form an arithmetic sequence.	Easy2	ImplementationBrute force+1	No attempts yet	2s	128 MB	Judgeable
Make It DivisibleFind the smallest two-digit replacement (00-99) for the last two digits of N that makes N divisible by F.	Easy2	Brute forceMath+1	No attempts yet	2s	128 MB	Judgeable
Octal to BinaryConvert a huge octal number (up to 333,334 digits) into its binary representation without leading zeros.	Easy2	StringImplementation+1	No attempts yet	1s	256 MB	Judgeable
Sign of Integer SumsFor three separate lists of integers, compute each sum and print whether it is positive, negative, or zero, handling values up to 64-bit signed range.	Easy2	ImplementationMath	No attempts yet	2s	256 MB	Judgeable
Mobile Phone BillGiven up to 20 call durations, compute total cost under two per-block billing plans and print the cheaper one with its cost.	Easy2	SimulationImplementation+1	No attempts yet	2s	128 MB	Judgeable
House Number SignCompute the total width of a house-number sign given fixed per-digit widths and 1 cm margins between digits and at both ends, for each input number until 0 appears.	Easy2	ImplementationString+1	No attempts yet	1s	128 MB	Judgeable
Easy Sequence SumGiven a sequence where each integer k repeats k times, compute the sum of terms between positions A and B.	Easy2	MathSimulation+1	No attempts yet	2s	128 MB	Judgeable
TV SizeGiven a TV's diagonal length and height-to-width ratio, compute the actual height and width, flooring non-integer results.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Year Progress BarGiven a date and time string, compute what percentage of the current year (accounting for leap years) has elapsed.	Easy2	ImplementationMath	No attempts yet	2s	128 MB	Judgeable
Actual Disk SpaceGiven N file sizes and a cluster size, compute total disk space used by rounding each file up to the nearest cluster multiple and summing.	Easy2	MathImplementation+1	No attempts yet	2s	128 MB	Judgeable
Reversed AdditionReverse the digits of two numbers up to 1000, add the reversed values, then reverse the sum and print the result.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
24-Hour MissionGiven the current time and a start time in HH:MM:SS, compute the time remaining until the start time next occurs within a 24-hour cycle.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Time MachineGiven three two-digit numbers from a digital clock, count how many of the 6 permutations form a valid HH:MM:SS time.	Easy2	CombinatoricsBrute force+1	No attempts yet	2s	128 MB	Judgeable
Room NumberGiven a room number, count how many plastic digit sets (0-9 each) are needed, treating 6 and 9 as interchangeable when flipped.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Adjusted AverageGiven N exam scores, rescale each by dividing by the maximum score and multiplying by 100, then output the average of the rescaled scores.	Easy2	ArrayMath+1	No attempts yet	2s	128 MB	Judgeable
Manhattan Distance on a Four-Row Number BoardGiven two numbers placed column by column in a 4-row grid, compute the Manhattan distance between their cell positions.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Chicken CouponsGiven n chicken coupons and a stamp-to-coupon exchange rate k, compute the maximum chickens obtainable by repeatedly redeeming stamps for new coupons.	Easy2	MathSimulation+1	No attempts yet	2s	128 MB	Judgeable
Growth PointsSimulate a tree that multiplies its leaves by a yearly factor then subtracts pruned branches, and report the final leaf count.	Easy2	SimulationMath	No attempts yet	1s	128 MB	Judgeable
Break-Even PointGiven fixed cost A, variable cost B, and price C, find the smallest number of laptops where revenue exceeds total cost, or -1 if impossible.	Easy2	MathImplementation	No attempts yet	0.35s	128 MB	Judgeable
Next Term in a SequenceGiven a sequence that is either arithmetic or geometric, determine which type it is and output its next term.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Fraction SumAdd two given fractions and output the sum reduced to lowest terms using GCD.	Easy2	MathNumber theory+1	No attempts yet	2s	128 MB	Judgeable
Concatenating Numbers 1Compute the total digit count when integers from 1 to N are written consecutively without spaces.	Easy2	MathImplementation	No attempts yet	0.15s	128 MB	Judgeable
Numbers With Equal Remainder and QuotientGiven N, find the sum of all positive integers x whose quotient and remainder are equal when divided by N.	Easy2	Math	No attempts yet	2s	256 MB	Judgeable
Octopus NumbersConvert base-8 strings using nine special symbols (including one for digit -1) into their decimal integer values until a terminator line appears.	Easy2	StringMath+1	No attempts yet	1s	128 MB	Judgeable
Good License PlatesFor each license plate, compute a base-26 value from the three letters and compare it to the four-digit number, printing whether their difference is within 100.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Fourth PointGiven two adjacent sides of a parallelogram as endpoint coordinates, compute and print the fourth vertex for each line of input.	Easy2	GeometryMath+1	No attempts yet	2s	128 MB	Judgeable
Year 2007Given a month and day in 2007, compute and print the corresponding day of the week starting from Monday, Jan 1.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Least Common MultipleFor each of up to 1000 pairs of numbers, compute and print the least common multiple.	Easy2	MathNumber theory	No attempts yet	1s	128 MB	Judgeable
Counting Pentagon PointsCompute the total pentagonal points after N steps using a simple arithmetic formula, modulo 45678.	Easy2	MathImplementation	No attempts yet	2s	256 MB	Judgeable
Perfect SquaresGiven two numbers M and N up to 10000, sum all perfect squares in that inclusive range and print the smallest one, or -1 if none exist.	Easy2	MathBrute force+1	No attempts yet	2s	128 MB	Judgeable
Counting PrimesCount how many of up to 100 given numbers (each at most 1000) are prime.	Easy2	MathBrute force	No attempts yet	2s	128 MB	Judgeable
PlugsGiven N power strips each with a plug capacity, compute the max number of computers powered when strips are chained from one wall outlet.	Easy2	MathGreedy+1	No attempts yet	2s	256 MB	Judgeable
Self-Replicating NumberCheck whether squaring an integer N reproduces N as the trailing digits of N squared.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Day of the YearGiven day, month, year, compute the day's ordinal number within that year accounting for leap years, until a 0 0 0 terminator.	Easy2	ImplementationMath	No attempts yet	1s	128 MB	Judgeable
Number GameRepeatedly sum decimal digits of each number until one digit remains, processing lines until a terminating zero.	Easy2	MathImplementation	No attempts yet	2s	128 MB	Judgeable
Prime WordSum letter values (a-z=1-26, A-Z=27-52) for a word and print whether the sum is prime (with 1 counted as prime).	Easy2	StringMath+1	No attempts yet	2s	128 MB	Judgeable
Restoring NumbersFor each given integer up to 100,000, output its prime factorization as prime-exponent pairs in increasing order.	Easy2	MathNumber theory+1	No attempts yet	2s	128 MB	Judgeable
Sum of Consecutive IntegersGiven two integers, print the sum of all integers in the closed range between them, handling either order.	Easy2	MathImplementation	No attempts yet	0.25s	128 MB	Judgeable