Interview warm-up

Short whiteboard warmups

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Total results4,880 problems

Polynomial Derivative (Small)
Easy1
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
FizzBuzz
Easy1
Implementation, Math+2
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Final Score
Easy1
Hash map, Implementation+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Sim Card
Easy1
Implementation, Brute force+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Vera's Fashion
Easy1
Math, Combinatorics+1
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Rectangle
Easy1
Implementation, Math+2
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Helmet and Vest
Easy1
Array, Implementation+2
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
What Is Your Name Score?
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
General Election
Easy1
Array, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Passionate Sorting
Easy1
Sorting, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Hongik University
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Jerry and Tom
Easy1
Math, Number theory+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Missing Runner
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Serious Problem
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Sort Master Bae Jihoon
Easy1
Array, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Greetings!
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Born in 1998, but 2541 in Thailand?!
Easy1
Math, Implementation+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Extreme Temperatures
Easy1
Implementation, Array+2
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Petrol
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Three Integers
Easy1
Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Counting Vowels
Easy1
String, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Exam
Easy1
Array, Implementation+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Inversion of a String
Easy1
String, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Mode
Easy1
Implementation, Array
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
The Walking Adam
Easy1
String, Implementation+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
What Is the Newbie Criterion?
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Minimum and Maximum 2
Easy1
Array, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Timecard
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Covid-19
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Three Points for a Win
Easy1
Implementation, Array+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Bottle Return
Easy1
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Coins
Easy1
Implementation, Math+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
SMS from MCHS
Easy1
Implementation, Brute force
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Win Coffee Through a Raffle
Easy1
Implementation, Array+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Java Bitecode
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Sunrin Internet High School Anthem
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Konpeito
Easy1
Math, Implementation+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
A Simple Problem
Easy1
Implementation, Brute force
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Finding the Easiest Problem
Easy1
Implementation, Array
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
The Suffering of 5
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Academic Distance
Easy1
Implementation, Math+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Statistics
Easy1
Array, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
driip
Easy1
String, Implementation
No attempts yet
Time limit
0.5s
Memory limit
16 MB
Judgeable
Printing Snails - Square
Easy1
Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Boss, you should gamble just for fun
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Split
Easy1
Array, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Calculation
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Remainder
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Moving
Easy1
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Complex String
Easy1
String, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Hour Hand
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Next Character
Easy1
String, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Height
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Sports Day
Easy1
Implementation, String+2
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Algorithm Class - Algorithm Runtime 1
Easy1
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Cupcake Party
Easy1
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Provinces and Gold
Easy1
Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Triathlon
Easy1
Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Studying Pointers
Easy1
Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Nice Raises
Easy1
Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
I Love You, Yonsei
Easy1
Implementation
No attempts yet
Time limit
1.885s
Memory limit
1024 MB
Judgeable
Chronogram
Easy1
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Pizza
Easy1
Math, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
The Missing Letter
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Socks
Easy1
String, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Hurra!
Easy1
Implementation, Math
No attempts yet
Time limit
6s
Memory limit
1024 MB
Judgeable
Rain Diary
Easy1
Implementation, Math
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Emoji Input Difficulty
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Marathon Race
Easy1
Array, Brute force
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Factorial 2
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
Indicator
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Style change
Easy1
String, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Letters and Scales
Easy1
Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Welcome to SMUPC!
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Busil wants to be friends
Easy1
Intervals, 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
Flipping letters
Easy1
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Rust Study
Easy1
Array, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Malvika is peculiar about balloon colors
Easy1
String, 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
Go to Jinju! (Easy)
Easy1
Implementation, Array
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Tuesday
Easy1
Math, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Going to School
Easy1
Implementation, Array
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Wow and Queries
Easy1
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Hat Circle
Easy1
Array, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Gahui and the 4-Hour Wall 1
Easy1
Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Command Prompt
Easy2
String, Implementation
No attempts yet
Time limit
2s
Memory limit
128 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
White Squares
Easy2
Array, Implementation+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Word Count
Easy2
String, Implementation
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Most Frequent Letter
Easy2
Hash map, String+1
No attempts yet
Time limit
2s
Memory limit
128 MB
Judgeable
Basketball Game
Easy2
Hash map, Implementation+1
No attempts yet
Time limit
1s
Memory limit
128 MB
Judgeable
Word Sorting
Easy2
Sorting, String
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Sign of Integer Sums
Easy2
Implementation, Math
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Splitting a Word
Easy2
String, Brute force+1
No attempts yet
Time limit
2s
Memory limit
128 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

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
Polynomial Derivative (Small)Given the nonzero terms of a polynomial, compute the value of its derivative at x = 1.	Easy1	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
FizzBuzzPrint the numbers 1 through N, writing Fizz for multiples of X, Buzz for multiples of Y, and FizzBuzz for multiples of both.	Easy1	ImplementationMath+2	No attempts yet	1s	512 MB	Judgeable
Final ScoreGiven the rosters of two teams and the names of the goal scorers, count each team's goals and decide which team scored more.	Easy1	Hash mapImplementation+1	No attempts yet	2s	512 MB	Judgeable
Sim CardFor each student, compute the smallest total cost of call minutes and data across the three fixed operator price plans.	Easy1	ImplementationBrute force+1	No attempts yet	2s	512 MB	Judgeable
Vera's FashionGiven N tops and N bottoms colored 1 to N, count how many top and bottom pairs have different colors.	Easy1	MathCombinatorics+1	No attempts yet	2s	256 MB	Judgeable
RectangleImplement a Rectangle class with width and height, range-checked setters, and methods for area, perimeter, and square detection.	Easy1	ImplementationMath+2	No attempts yet	1s	512 MB	Judgeable
Helmet and VestGiven a list of helmet defense values and a list of vest values, print the sum of the best helmet and the best vest.	Easy1	ArrayImplementation+2	No attempts yet	1s	512 MB	Judgeable
What Is Your Name Score?Given an uppercase name, sum the alphabetical position of each letter and print the total.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
General ElectionSum each candidate's votes across regions and print the candidate number with the largest total.	Easy1	ArrayImplementation	No attempts yet	2s	512 MB	Judgeable
Passionate SortingRead N numbers and print them in ascending order separated by spaces.	Easy1	SortingImplementation	No attempts yet	1s	512 MB	Judgeable
Hongik UniversityRead a year N and print how many years have passed since 1946, so output N minus 1946.	Easy1	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Jerry and TomSubtract the fraction A/B from 1 and print the remaining cheese as P/Q in lowest terms.	Easy1	MathNumber theory+1	No attempts yet	1s	128 MB	Judgeable
Missing RunnerGiven the numbers 1 to N with exactly one omitted from a list of N - 1 distinct values, report the missing number.	Easy1	MathImplementation	No attempts yet	1s	256 MB	Judgeable
Serious ProblemCount how many times 2 and e appear in a string of those two characters and report which is more frequent, or yee if tied.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Sort Master Bae JihoonGiven N integers, print the largest value, which is the last element after sorting in ascending order.	Easy1	ArrayImplementation	No attempts yet	1s	256 MB	Judgeable
Greetings!Given a greeting of the form h followed by e's and a y, print the same greeting but with twice as many e's.	Easy1	StringImplementation	No attempts yet	1s	512 MB	Judgeable
Born in 1998, but 2541 in Thailand?!Given a Buddhist calendar year between 1000 and 3000, print the corresponding Gregorian year by subtracting 543.	Easy1	MathImplementation+2	No attempts yet	1s	1024 MB	Judgeable
Extreme TemperaturesRead lines that pair a date with integer temperatures and print the smallest and largest values across every measurement.	Easy1	ImplementationArray+2	No attempts yet	2s	512 MB	Judgeable
PetrolGiven the petrol n used next month and the leftover quota k, compute the cost where the first 60+k liters cost 1500 each and the rest cost 3000 each.	Easy1	MathImplementation	No attempts yet	2s	512 MB	Judgeable
Three IntegersGiven three integers, each either 1 or 2, print whichever value appears more often.	Easy1	Implementation	No attempts yet	2s	512 MB	Judgeable
Counting VowelsCount how many characters in a lowercase string are one of the vowels a, i, u, e, o.	Easy1	StringImplementation	No attempts yet	2s	512 MB	Judgeable
ExamRead three scores and print the sum of the two largest.	Easy1	ArrayImplementation+1	No attempts yet	2s	512 MB	Judgeable
Inversion of a StringReverse the substring of S from position A to position B, keep the rest unchanged, and print the resulting string.	Easy1	StringImplementation	No attempts yet	2s	512 MB	Judgeable
ModeCount how many times each value from 1 to M appears in the sequence and print the largest count.	Easy1	ImplementationArray	No attempts yet	2s	512 MB	Judgeable
The Walking AdamGiven a string of 'U' and 'D' steps, find the index of the first 'D', or the string length if no 'D' appears.	Easy1	StringImplementation+1	No attempts yet	2s	512 MB	Judgeable
What Is the Newbie Criterion?Given N and a year M, print NEWBIE! for years 1 or 2, OLDBIE! for years up to N, and TLE! otherwise.	Easy1	ImplementationMath	No attempts yet	1s	512 MB	Judgeable
Minimum and Maximum 2For each of T test cases, read N integers and print the smallest and largest value separated by a space.	Easy1	ArrayImplementation	No attempts yet	1s	256 MB	Judgeable
TimecardGiven a name made of uppercase and lowercase letters, print the same name with every uppercase letter converted to lowercase.	Easy1	StringImplementation	No attempts yet	1s	512 MB	Judgeable
Covid-19Given the average daily new cases p and hospitalizations q per million, print the risk color White, Yellow, or Red based on two thresholds.	Easy1	ImplementationMath	No attempts yet	2s	512 MB	Judgeable
Three Points for a WinGiven the scores of N matches, add 3 points for each win, 1 for each draw, and 0 for each loss, then print the total.	Easy1	ImplementationArray+1	No attempts yet	1s	512 MB	Judgeable
Bottle ReturnGiven counts of six container types, sum them and multiply by the 5 cent New York deposit to get the refund.	Easy1	MathImplementation+1	No attempts yet	1s	512 MB	Judgeable
CoinsGiven n coins each showing 0 or 1, find the minimum number of flips needed to make all coins show the same side.	Easy1	ImplementationMath+1	No attempts yet	2s	1024 MB	Judgeable
SMS from MCHSGiven today's and tomorrow's temperature and wind speed, print one of three fixed warning messages according to the first matching condition, or "No message".	Easy1	ImplementationBrute force	No attempts yet	1s	512 MB	Judgeable
Win Coffee Through a RaffleGiven nine problem scores, decide whether the student is a hacker (any score over the max), else eligible for the raffle if the total is at least 100, else not eligible.	Easy1	ImplementationArray+2	No attempts yet	1s	1024 MB	Judgeable
Java BitecodeRead a string of uppercase letters and print it with every J, A, and V removed, or print nojava if nothing remains.	Easy1	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Sunrin Internet High School AnthemGiven a string with no spaces, print its last five characters.	Easy1	StringImplementation	No attempts yet	1s	512 MB	Judgeable
KonpeitoGiven three counts A, B, C, find the minimum total pieces that must be added so all three counts become equal.	Easy1	MathImplementation+1	No attempts yet	2s	1024 MB	Judgeable
A Simple ProblemFor each of n problems, given its counts of branching and loop statements, decide whether the pair satisfies one of two simple conditions.	Easy1	ImplementationBrute force	No attempts yet	2s	256 MB	Judgeable
Finding the Easiest ProblemRead N titles with distinct difficulties and print the title whose difficulty is the smallest.	Easy1	ImplementationArray	No attempts yet	1s	1024 MB	Judgeable
The Suffering of 5Read a five-digit number and print the sum of the fifth powers of its five digits.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
Academic DistanceGiven N points in order, compute the total Manhattan distance along the path from the first point to the last.	Easy1	ImplementationMath+1	No attempts yet	2s	512 MB	Judgeable
StatisticsFor each line of input, read n numbers and print the case number along with the minimum, maximum, and range of the sample.	Easy1	ArrayImplementation	No attempts yet	2s	1024 MB	Judgeable
driipGiven a lowercase string, print "cute" if it ends with the suffix "driip", otherwise print "not cute".	Easy1	StringImplementation	No attempts yet	0.5s	16 MB	Judgeable
Printing Snails - SquareGiven N, print a hollow N by N square outline of snail symbols, N+2 snails on the top and bottom lines and two snails per middle line.	Easy1	Implementation	No attempts yet	1s	512 MB	Judgeable
Boss, you should gamble just for funRead each bet amount until -1, then print the sum of all bet amounts that Yunsung lost.	Easy1	ImplementationMath	No attempts yet	1s	512 MB	Judgeable
SplitGiven a distinct integer sequence, find its maximum, then output the sum of elements before it and the sum of elements after it.	Easy1	ArrayImplementation	No attempts yet	2s	1024 MB	Judgeable
CalculationGiven two integers A and B, print the larger and then the smaller of A+B and A-B.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
RemainderRead a positive integer X between 1 and 100 and print the remainder when X is divided by 21.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
MovingGiven travel times X from A to B and Y from B to C, check whether X + Y fits within Z hours and 30 minutes.	Easy1	ImplementationMath	No attempts yet	2s	1024 MB	Judgeable
Complex StringGiven a string of length N over the letters A through E, decide whether at least 3 distinct characters appear.	Easy1	StringImplementation	No attempts yet	2s	1024 MB	Judgeable
Hour HandGiven the mark A where the hour hand rests and B hours elapsed, print the mark the hand points to afterward.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Next CharacterFor each position from 2 to N, print the previous character if the current character is J, one per line.	Easy1	StringImplementation	No attempts yet	2s	1024 MB	Judgeable
HeightGiven JOI's height a year ago and his height now, print how many centimeters he grew.	Easy1	MathImplementation	No attempts yet	2s	1024 MB	Judgeable
Sports DayGiven N students, K on the Red Team, and a string listing the other N-1 students' teams, decide Aoi's team.	Easy1	ImplementationString+2	No attempts yet	2s	1024 MB	Judgeable
Algorithm Class - Algorithm Runtime 1Given n, print how many times the single return statement in the MenOfPassion pseudocode runs, then print the degree of that count as a polynomial.	Easy1	MathImplementation+1	No attempts yet	1s	512 MB	Judgeable
Cupcake PartyGiven R boxes of 8 cupcakes and S boxes of 3 cupcakes, find the number left after 28 students each take one.	Easy1	MathImplementation+1	No attempts yet	1s	1024 MB	Judgeable
Provinces and GoldGiven the counts of Gold, Silver, and Copper in a hand, find the best victory card and best treasure card Jake can afford with his total buying power.	Easy1	Implementation	No attempts yet	1s	1024 MB	Judgeable
TriathlonGiven N participants' scores a, d, and g, compute a times (d+g), doubled when a equals d+g, and print the highest score.	Easy1	Implementation	No attempts yet	1s	512 MB	Judgeable
Studying PointersGiven N, print the declarations of an N-level pointer chain to the int variable a, one declaration per line, with pointers named ptr, ptr2, up to ptrN.	Easy1	Implementation	No attempts yet	1s	1024 MB	Judgeable
Nice RaisesGiven a fixed raise and n salaries, count whether more members prefer the fixed raise or doubling their salary, printing 1, 2, or 0 on a tie.	Easy1	Implementation	No attempts yet	1s	1024 MB	Judgeable
I Love You, YonseiGiven the starting letter c, find the minimum total distance to step on the tiles spelling ILOVEYONSEI in order, where distance is the difference in alphabet positions.	Easy1	Implementation	No attempts yet	1.885s	1024 MB	Judgeable
ChronogramGiven text lines, sum the Roman numeral letter values (I, V, X, L, C, D, M) in each line and output the total as the year.	Easy1	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
PizzaGiven a slice's area and price and a round pizza's radius and price, print which option gives more pizza per dollar for each dataset.	Easy1	MathImplementation	No attempts yet	1s	1024 MB	Judgeable
The Missing LetterGiven 25 distinct uppercase English letters, print the one letter of the alphabet that is missing.	Easy1	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
SocksGiven a string of B and C socks, count how many same-color pairs of socks can be formed.	Easy1	StringImplementation	No attempts yet	2s	1024 MB	Judgeable
Hurra!Print the numbers 1 to N, replacing multiples of 7 with Hurra!, multiples of 11 with Super!, and multiples of both with Wiwat!.	Easy1	ImplementationMath	No attempts yet	6s	1024 MB	Judgeable
Rain DiaryGiven today's day number n and the day m from the record two weeks ago, print the day number for last Sunday's record.	Easy1	ImplementationMath	No attempts yet	1s	1024 MB	Judgeable
Emoji Input DifficultyGiven an emoji name like :chino_shock:, compute its input difficulty: its length plus the colon count plus 5 times the underscore count.	Easy1	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Marathon RaceGiven N race times, output for each student the count of students with a strictly smaller time, plus one.	Easy1	ArrayBrute force	No attempts yet	2s	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
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
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
Style changeConvert each camelCase or CamelCase variable name to snake_case by lowercasing all letters and inserting an underscore before each capital letter.	Easy1	StringImplementation	No attempts yet	2s	1024 MB	Judgeable
Letters and ScalesGiven n scales and a word s, find the minimum number of cubes needed to show s on the scales in a row, or report Impossible.	Easy1	Implementation	No attempts yet	2s	1024 MB	Judgeable
Welcome to SMUPC!Given N, print the N-th letter of the repeating string WelcomeToSMUPC, which has length 14.	Easy1	StringImplementation	No attempts yet	1s	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
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
Flipping lettersGiven an N by N grid of d, b, q, and p, print the grid after flipping every letter vertically or horizontally.	Easy1	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
Rust StudyCount the days on which the pages Im-su actually studied are at least the planned pages for that day.	Easy1	ArrayImplementation	No attempts yet	1s	1024 MB	Judgeable
Malvika is peculiar about balloon colorsGiven a string of 'a' and 'b' characters, find the fewest characters to flip so that all characters match.	Easy1	StringImplementation	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
Go to Jinju! (Easy)Given N transport options with destinations and fares, find the fare to jinju and count the options that cost more than it.	Easy1	ImplementationArray	No attempts yet	1s	512 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
Going to SchoolGiven N buses with departure time S and travel time T, find the latest departure among buses where S + T is at most X, or print -1 if none qualify.	Easy1	ImplementationArray	No attempts yet	1s	1024 MB	Judgeable
Wow and QueriesGiven Q strings made of W and O, count how many times the substring WOW appears in each one.	Easy1	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Hat CircleGiven N people in a circle with hat numbers, count how many people have the same hat number as the person directly across from them.	Easy1	ArrayImplementation	No attempts yet	1s	1024 MB	Judgeable
Gahui and the 4-Hour Wall 1Given the rail time S and flight time F from station a to station b, decide which mode people take, where flights are chosen only when strictly faster.	Easy1	Implementation	No attempts yet	1s	512 MB	Judgeable
Command PromptGiven N equal-length file names, output a pattern where each position is the common character if all names agree there, or a question mark otherwise.	Easy2	StringImplementation	No attempts yet	2s	128 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
White SquaresGiven an 8x8 board marked with pieces and empty cells, count how many pieces sit on the white squares of the standard alternating coloring.	Easy2	ArrayImplementation+1	No attempts yet	2s	128 MB	Judgeable
Word CountCount the number of space-separated words in a string that may have leading or trailing spaces.	Easy2	StringImplementation	No attempts yet	2s	128 MB	Judgeable
Most Frequent LetterCount letter frequencies in a string, case-insensitively, and print the most common letter in uppercase or a question mark on ties.	Easy2	Hash mapString+1	No attempts yet	2s	128 MB	Judgeable
Basketball GameGiven N surnames, count first letters and print all letters (in order) that start at least five surnames, or PREDAJA if none does.	Easy2	Hash mapImplementation+1	No attempts yet	1s	128 MB	Judgeable
Word SortingDeduplicate a list of words and sort them first by length, then lexicographically.	Easy2	SortingString	No attempts yet	2s	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
Splitting a WordSplit a lowercase word into three nonempty parts, reverse each part, and find the lexicographically smallest concatenation among all splits.	Easy2	StringBrute force+1	No attempts yet	2s	128 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