Problems

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Total results21,019 problems

ResistanceEasy1
Hash map, ImplementationNo attempts yetTime limit2sMemory limit128 MB
Judgeable
Escape from a RectangleEasy1
Math, Geometry +1No attempts yetTime limit2sMemory limit128 MB
Judgeable
Print the AnswerEasy1
Implementation1 solvedTime limit1sMemory limit512 MB
Judgeable
Palindrome NumbersEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Counting VowelsEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Compare Two NumbersEasy1
ImplementationNo attempts yetTime limit1sMemory limit512 MB
Judgeable
HexadecimalEasy1
Math, ImplementationNo attempts yetTime limit2sMemory limit128 MB
Judgeable
MooEasy1
ImplementationNo attempts yetTime limit2sMemory limit128 MB
Judgeable
Rugby ClubEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Cutting ChocolateEasy1
Math, ImplementationNo attempts yetTime limit2sMemory limit128 MB
Judgeable
QuackEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
CrowingEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Livestock CountEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Clay PotEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print the Star PatternEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Dobby's English StudyEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
HowlEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
RookEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Safari WorldEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Star Printing - 1Easy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print Stars - 3Easy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print Stars - 4Easy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print Stars - 5Easy1
Implementation, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Star Printing 9Easy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Verification DigitEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Yutnori Throw ClassificationEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Star Printing - 12Easy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Star Printing - 13Easy1
Implementation, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Oven ClockEasy1
Math, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print the BirthdayEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print an Asterisk SquareEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Hello WorldEasy1
Implementation1 solvedTime limit1sMemory limit128 MB
Judgeable
Sum of Two Numbers - 2Easy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Maximum ValueEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Odd NumbersEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Average and MedianEasy1
Sorting, Array +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
MultiplicationEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
String RepetitionEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Least Common Multiple and Greatest Common DivisorEasy1
Math, Number theoryNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Typo Man Go ChangyoungEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Matrix AdditionEasy1
Matrix, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Multiplication TableEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print Numbers up to NEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Print N DownwardEasy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Word LengthEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Toggle Alphabet CaseEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Fibonacci NumberEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Sort NumbersEasy1
SortingNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Sorting Three NumbersEasy1
SortingNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Leap YearEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Grade Point CalculationEasy1
Implementation, Hash mapNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Beautiful NumberEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Study Abroad BanEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
After the PartyEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
FBIEasy1
String, ImplementationNo attempts yetTime limit0.25sMemory limit128 MB
Judgeable
Alarm ClockEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
SangsuEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Musical ScaleEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Completing a Chess SetEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Find R2Easy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
ABCEasy1
Sorting, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
RemaindersEasy1
Hash map, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Taxicab GeometryEasy1
Math, Geometry +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Sum of Missing CharactersEasy1
String, Hash map +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
SharesEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Is the First Number Greater?Easy1
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
The Good and the BadEasy1
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Capitalize the First LetterEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Line NumbersEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
The Navi-Computer is Down!Easy1
Math, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
No BrainerEasy1
Implementation, Brute forceNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Speed LimitEasy1
Implementation, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Clay BullyEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
LunacyEasy1
Implementation, MathNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Mirror, Oh! MirrorEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Counting LinesEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Spinner Lock SimulationEasy1
Simulation, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
PhD ProgramEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
TGN Advertising DecisionEasy1
Implementation, MathNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Triangle and Its Three SidesEasy1
Implementation, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Divisors and MultiplesEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Sarah's ToysEasy1
Math, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Pair SumEasy1
Simulation, Brute force +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Even Sum Versus Odd SumEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
WelcomeEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Call CenterEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
PyramidsEasy1
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
BillingEasy1
Hash map, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Battle Droid PriceEasy1
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Card GameEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Match ResultsEasy1
Implementation, SimulationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Entry Log ManagementEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
SanggeunaldEasy1
Implementation, Math +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
The Errand RouteEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
ReceiptEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
JOI and IOIEasy1
String, Brute force +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Exam ScoresEasy1
Implementation, MathNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Find the Students Who Didn't SubmitEasy1
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Hot DogsEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Sanggeun's FriendsEasy1
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
ResistanceGiven three color names, map each to its digit or multiplier using a fixed table and print the resulting resistance value.	Easy1	Hash mapImplementation	No attempts yet	2s	128 MB	Judgeable
Escape from a RectangleGiven a point inside an axis-aligned rectangle, compute the minimum distance from the point to the nearest side of the rectangle.	Easy1	MathGeometry+1	No attempts yet	2s	128 MB	Judgeable
Print the AnswerPrint the fixed literal text "문제의 정답" with no input given.	Easy1	Implementation	1 solved33% accepted	1s	512 MB	Judgeable
Palindrome NumbersFor each integer up to 99999 in a terminated input list, print whether its decimal digits form a palindrome.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Counting VowelsFor each input line until a terminating '#', count how many letters are vowels regardless of case.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Compare Two NumbersRead two integers and print whether the first is greater than, less than, or equal to the second.	Easy1	Implementation	No attempts yet	1s	512 MB	Judgeable
HexadecimalConvert a hexadecimal number of at most 6 digits into its decimal value and print it.	Easy1	MathImplementation	No attempts yet	2s	128 MB	Judgeable
MooWrite a program that prints a fixed ASCII art cow exactly, with no input given.	Easy1	Implementation	No attempts yet	2s	128 MB	Judgeable
Rugby ClubRead repeated name/age/weight lines until a sentinel and print whether each member is Senior or Junior based on simple thresholds.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Cutting ChocolateCompute the minimum number of straight cuts needed to divide an N by M chocolate bar into all 1x1 pieces.	Easy1	MathImplementation	No attempts yet	2s	128 MB	Judgeable
QuackPrint a fixed ASCII-art duck exactly, matching every character and line with no input.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
CrowingPrint a fixed ASCII art rooster with no input, matching the exact spacing and characters.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
Livestock CountPrint a fixed, exact livestock count table with no computation involved.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Clay PotPrint a fixed ASCII-art shape of a clay pot exactly as specified, with no algorithmic content.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Print the Star PatternPrint a fixed, predetermined star pattern made only of periods and asterisks, with no input.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Dobby's English StudyFor each line, count how many times a given letter (case-insensitive) appears in a sentence until a line with only '#' ends input.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
HowlPrint a fixed wolf ASCII art picture exactly, with no input and no extra spaces.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
RookPrint a fixed ASCII-art picture of a chess rook exactly as given, with no extra spaces or lines.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Safari WorldRead two integers and print the absolute value of their difference.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Star Printing - 1Given N, print a triangle pattern where line i contains exactly i stars.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Print Stars - 3Print N lines of stars where the count decreases from N down to 1.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Print Stars - 4Print a right-aligned triangle of stars with N stars on the first line decreasing to 1 star on the last line.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Print Stars - 5Print a centered pyramid of stars with N lines, where line i has 2i-1 stars padded with spaces.	Easy1	ImplementationSimulation	No attempts yet	1s	128 MB	Judgeable
Star Printing 9Print an hourglass-shaped star pattern of stars and spaces based on an integer N.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Verification DigitCompute the check digit as the sum of squares of five given digits, mod 10.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Yutnori Throw ClassificationClassify three yut-stick throws into one of five results based on how many of four values equal 0.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Star Printing - 12Print a diamond-like pattern of N to 1 to N stars with leading spaces forming 2N-1 lines.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Star Printing - 13Given N, print a pyramid of stars that grows one star per line up to N then shrinks back down, using 2N-1 lines total.	Easy1	ImplementationSimulation	No attempts yet	1s	128 MB	Judgeable
Oven ClockGiven a start time and a number of minutes to cook, compute and print the finishing time on a 24-hour clock.	Easy1	MathSimulation	No attempts yet	1s	128 MB	Judgeable
Print the BirthdayPrint a fixed hardcoded birthday date in month/day format with no real input or logic.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Print an Asterisk SquareRead an integer N and print an N by N square made of asterisk characters.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Hello WorldPrint the fixed string 'Hello World!' with no input required.	Easy1	Implementation	1 solved100% accepted	1s	128 MB	Judgeable
Sum of Two Numbers - 2Read two single-digit integers from separate lines and print their sum.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Maximum ValueRead nine distinct natural numbers and print the maximum value along with its 1-based position.	Easy1	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
Odd NumbersGiven seven natural numbers, print the sum of the odd ones and the smallest odd one, or -1 if none exist.	Easy1	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
Average and MedianRead five natural numbers and print their average and median.	Easy1	SortingArray+1	No attempts yet	1s	128 MB	Judgeable
MultiplicationGiven two three-digit numbers, print the partial products from vertical multiplication and their total.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
String RepetitionGiven repeat count R and string S, output the string formed by repeating each character of S exactly R times in order.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Least Common Multiple and Greatest Common DivisorFor multiple integer pairs, compute and print each pair's least common multiple and greatest common divisor.	Easy1	MathNumber theory	No attempts yet	1s	128 MB	Judgeable
Typo Man Go ChangyoungGiven a string and a 1-based position, output the string with that one character removed, for multiple test cases.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Matrix AdditionRead two N by M integer matrices and print their element-wise sum.	Easy1	MatrixImplementation	No attempts yet	1s	128 MB	Judgeable
Multiplication TablePrint the multiplication table for a given integer N from N1 to N9 in the exact required format.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Print Numbers up to NRead an integer N and print every integer from 1 to N on separate lines.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Print N DownwardRead a number N and print integers from N down to 1, one per line.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
Word LengthRead a word of at most 100 letters and print its length.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Toggle Alphabet CaseRead a word up to length 100 and print it with every letter's case swapped.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Fibonacci NumberCompute the nth Fibonacci number for n up to 45.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Sort NumbersRead N integers and print them sorted in ascending order, one per line.	Easy1	Sorting	No attempts yet	1s	128 MB	Judgeable
Sorting Three NumbersRead three distinct integers and print them sorted from smallest to largest.	Easy1	Sorting	No attempts yet	1s	128 MB	Judgeable
Leap YearGiven a year, output 1 if it is a leap year according to the standard divisibility rule, otherwise output 0.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Grade Point CalculationRead a letter grade string and print its corresponding fixed grade point value from a lookup table.	Easy1	ImplementationHash map	No attempts yet	1s	128 MB	Judgeable
Beautiful NumberFor each given integer, count how many distinct decimal digits it contains.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Study Abroad BanDelete every character in a given uppercase word that appears in the letters of 'CAMBRIDGE' and print the rest.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
After the PartyCompute actual attendees as L times P, then output the difference between each of five reported counts and that value.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
FBIGiven five agent codes, print the 1-based positions of those containing the substring FBI, or a fixed message if none do.	Easy1	StringImplementation	No attempts yet	0.25s	128 MB	Judgeable
Alarm ClockGiven an alarm time in hours and minutes, compute and print the time 45 minutes earlier, wrapping around midnight if needed.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
SangsuReverse two given three-digit numbers digit by digit and print the larger reversed value.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Musical ScaleGiven a permutation of 1 through 8, print whether it is strictly ascending, strictly descending, or otherwise mixed.	Easy1	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
Completing a Chess SetGiven counts of six white chess piece types, output how many of each must be added or removed to reach a complete 16-piece set.	Easy1	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
Find R2Given R1 and the average S of two integers, compute and print the other integer R2.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
ABCSort three distinct numbers into A, B, C and print them in an order given by a 3-letter permutation string.	Easy1	SortingImplementation	No attempts yet	1s	128 MB	Judgeable
RemaindersRead ten nonnegative integers, compute each mod 42, and print how many distinct remainder values occur.	Easy1	Hash mapImplementation	No attempts yet	1s	128 MB	Judgeable
Taxicab GeometryGiven radius R, compute and print the area of a Euclidean circle and a taxicab-metric circle.	Easy1	MathGeometry+1	No attempts yet	1s	128 MB	Judgeable
Sum of Missing CharactersFor each string, sum the ASCII values of uppercase letters that never appear in it.	Easy1	StringHash map+1	No attempts yet	1s	128 MB	Judgeable
SharesFor repeated pairs N and S, print the largest integer x such that N times x does not exceed S.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Is the First Number Greater?For each pair of positive integers read until a 0 0 line, print Yes when the first is greater than the second, otherwise No.	Easy1	Implementation	No attempts yet	1s	128 MB	Judgeable
The Good and the BadCount the letters g and b in each hero name, ignoring case, and print whether the name is GOOD, A BADDY, or NEUTRAL.	Easy1	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Capitalize the First LetterRead N sentences and print each one with its first letter changed to uppercase, leaving every other character as is.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Line NumbersRead N lines of text and print each one prefixed with its 1-based line number in the format "number. content".	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
The Navi-Computer is Down!Read pairs of 3D coordinates and system names, and print the Euclidean distance between each pair rounded to two decimals.	Easy1	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
No BrainerFor each zombie, compare the number of brains it eats X with the number it needs Y, and print whether X is at least Y.	Easy1	ImplementationBrute force	No attempts yet	1s	128 MB	Judgeable
Speed LimitGiven segments of constant speed with cumulative elapsed times, compute the total distance for each data set until n equals -1.	Easy1	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Clay BullyFor each class, read each student's block dimensions and name, then print the bully with the largest volume and the victim with the smallest volume.	Easy1	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
LunacyFor each non-negative Earth weight read until a negative sentinel, print a sentence giving the weight on the Moon at 0.167 times the Earth weight, both rounded to two decimals.	Easy1	ImplementationMath	No attempts yet	1s	128 MB	Judgeable
Mirror, Oh! MirrorRead lines of ASCII text until a line of three asterisks, and print each line with its characters reversed.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Counting LinesRead all input lines, including empty ones, and print how many there are.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
Spinner Lock SimulationGiven the starting digits of a spinner lock and a sequence of button labels, add each label's digits to the wheels modulo 10 and print the final readout.	Easy1	SimulationImplementation+2	No attempts yet	1s	128 MB	Judgeable
PhD ProgramRead N problems, output a+b for each addition line and 'skipped' for the line P=NP.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
TGN Advertising DecisionFor each test case, compare the no-ad revenue r against e minus c, then print advertise, do not advertise, or does not matter.	Easy1	ImplementationMath	No attempts yet	1s	128 MB	Judgeable
Triangle and Its Three SidesRead triples of positive integers until 0 0 0, and for each print Equilateral, Isosceles, Scalene, or Invalid based on equal sides and the triangle inequality.	Easy1	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Divisors and MultiplesFor each pair of numbers, print factor if the first divides the second, multiple if the first is a multiple of the second, or neither.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Sarah's ToysFor each night, subtract the toys left around the house from the total, then report how many pairs and whether one group of 3 is formed.	Easy1	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
Pair SumThis is a straightforward simulation task where numbers in each test case are used to enumerate pairs. For each input n, all pairs of distinct natural numbers with sum n are printed in lexicographic order. Because n is at most 12, iterating all possible a and b values directly works. Implemented with simple loops, this problem is a typical warm-up exercise.	Easy1	SimulationBrute force+1	No attempts yet	1s	128 MB	Judgeable
Even Sum Versus Odd SumFor each of up to 50 sequences, add the even numbers and the odd numbers separately and print EVEN, ODD, or TIE based on which sum is larger.	Easy1	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
WelcomePrint the three-line ASCII art that spells the word Welcome, matching every space and symbol exactly.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
Call CenterPrint a fixed piece of ASCII art of C3PO sitting at a call center, matching the example exactly.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
PyramidsFor each positive base size n until a terminating 0, print the total number of blocks in a pyramid whose layers count down from n to 1.	Easy1	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
BillingRead item names until EOI and print the total cost of all listed supplies with a dollar sign and two decimals.	Easy1	Hash mapImplementation	No attempts yet	1s	128 MB	Judgeable
Battle Droid PriceFor each test case, multiply five part quantities by fixed prices, sum them, and print the total with a dollar sign and two decimals.	Easy1	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
Card GameRead five round scores and print their sum.	Easy1	ArrayImplementation	No attempts yet	1s	256 MB	Judgeable
Match ResultsRead N rounds of scores for A and B, and report how many rounds each player won.	Easy1	ImplementationSimulation	No attempts yet	1s	256 MB	Judgeable
Entry Log ManagementRead N names and print each one converted to lowercase, one per line.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
SanggeunaldGiven prices for three burgers and two drinks, print the lowest cost of one burger plus one drink minus a 50 won combo discount.	Easy1	ImplementationMath+2	No attempts yet	1s	128 MB	Judgeable
The Errand RouteAdd four travel times given in seconds and print the total split into minutes on the first line and seconds on the second.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
ReceiptGiven the total price of 10 books and the prices of 9 of them, find the missing book's price.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
JOI and IOICount how many length-3 windows of a string equal JOI and how many equal IOI, including overlaps.	Easy1	StringBrute force+1	No attempts yet	1s	128 MB	Judgeable
Exam ScoresGiven the four subject scores of two students, print the larger of the two totals, or Minguk's total when they tie.	Easy1	ImplementationMath	No attempts yet	1s	128 MB	Judgeable
Find the Students Who Didn't SubmitGiven 28 distinct attendance numbers from 1 to 30, print the two missing numbers in increasing order.	Easy1	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
Hot DogsRead pairs of integers H and P until end of file and print H/P rounded to exactly two decimal places.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Sanggeun's FriendsFor each test case, read the counts of male and female friends and print their sum; stop at the two zeros line.	Easy1	MathImplementation	No attempts yet	1s	128 MB	Judgeable