Problems

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Total results21,187 problems

Pizza PricingEasy2
Implementation, MathNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Refrigerator MagnetsEasy2
Implementation, String +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
VotingEasy2
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Mirror ImageEasy2
String, Hash map +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Gnome SequencingEasy2
Implementation, Sorting +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Remove the DuplicatesEasy2
Array, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Rock, Paper, ScissorsEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
ParityEasy2
String, Bit manipulation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
The Seven Percent SolutionEasy2
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
QuicksumEasy2
String, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
DoublesEasy2
Array, Hash map +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Magnificent MeatballsEasy2
Array, Prefix sum +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Haiku ReviewEasy2
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
St. IvesEasy2
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Fifty Coats of GrayEasy2
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Roaming RomansEasy2
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
The Twin ParadoxEasy2
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Parlay WageringEasy2
Simulation, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
A Contesting DecisionEasy2
Implementation, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Filling Out the TeamEasy2
Implementation, Brute force +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
General Chemistry LabEasy2
Implementation, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Financial ManagementEasy2
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Cantor SetEasy2
Recursion, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Tire DimensionsEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Next NumberEasy2
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
FIFA World CupEasy2
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Number Guessing GameEasy2
Implementation, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Judging OlympiaEasy2
Implementation, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Being Smarty!Easy2
Math, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
The Euclidean ClockEasy2
Math, Geometry +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
ICPC Score Totalizer SoftwareEasy2
Implementation, Sorting +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
SavingsEasy2
Simulation, Math +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Ah!Easy2
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Death Knight HeroEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
National Collegiate Programming Contest Club FederationEasy2
Brute force, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Card CuttingEasy2
Implementation, String +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Travelling SalesmanEasy2
Hash map, String +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Jean and Joe's ClothesEasy2
Implementation, Simulation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
DVDsEasy2
Implementation, Simulation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
NoMoPhobiaEasy2
Hash map, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
RecipesEasy2
Implementation, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Oil ExplorationEasy2
Array, Simulation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Map InterfaceEasy2
Array, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Bailout BonusEasy2
Implementation, Hash map +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Isn't It Funny How a Bear Likes Honey?Easy2
Math, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Contest SeatsEasy2
Implementation, Hash map +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Civil EngineeringEasy2
Implementation, Math +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Aerospace & Mechanical EngineeringEasy2
Simulation, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Alphabet DistanceEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
String TransformationsEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Error DetectionEasy2
Bit manipulation, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Vigenère CipherEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Stacked Floating MountainsEasy2
Implementation, Array +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Chess PuzzleEasy2
Implementation, Hash map +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Checkerboard RowsEasy2
Array, Hash map +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Counting Swann's CoinsEasy2
Implementation, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Fill the Rowboats!Easy2
Implementation, Simulation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Microsoft LogoEasy2
ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Secret LocationEasy2
String, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Greatest Common DivisorEasy2
Math, Number theory +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Least Common MultipleEasy2
Math, Number theory +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
J-BoxEasy2
Implementation, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Mars MathEasy2
Simulation, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Letter TrianglesEasy2
Implementation, String +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
DedupeEasy2
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Football TeamEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Garbled MessageEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
YodaEasy2
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Escape RouteEasy2
Brute force, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Total CountEasy2
Hash map, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Target PracticeEasy2
Implementation, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Which WayEasy2
Bit manipulation, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Annoying MosquitosEasy2
Brute force, Implementation +1No attempts yetTime limit1sMemory limit256 MB
Judgeable
Vacation HomeworkEasy2
Math, Greedy +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
LeagueEasy2
Implementation, Array +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Dice GameEasy2
Simulation, ArrayNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Time CardEasy2
Math, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
ContestEasy2
Sorting, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
ChangeEasy2
Greedy, Math +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Caesar CipherEasy2
String, Implementation +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
Card Flipping GameEasy2
Simulation, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Tunnel Entrance and ExitEasy2
Implementation, Simulation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Triangle Validity and ClassificationEasy2
Implementation, Math +2No attempts yetTime limit1sMemory limit128 MB
Judgeable
BirthdayEasy2
Implementation, Sorting +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Comparison OperatorsEasy2
Implementation, String +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
BakuganEasy2
Implementation, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Hailstone SequencesEasy2
Simulation, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Factorial BaseEasy2
Math, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
PangramEasy2
String, Hash map +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Jingle ComposingEasy2
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
FeynmanEasy2
Math, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Weekend LotteryEasy2
Array, ImplementationNo attempts yetTime limit3sMemory limit128 MB
Judgeable
Head or TailEasy2
Implementation, Array +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Pascal LibraryEasy2
Array, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Grade StatisticsEasy2
Sorting, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Roll-call in Woop Woop HighEasy2
Implementation, String +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Breed ProximityEasy2
Array, Hash map +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Contest TimingEasy2
Math, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Math PracticeEasy2
Math, Brute force +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
String Function EncodingEasy2
String, SimulationNo attempts yetTime limit1sMemory limit128 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
Pizza PricingFor each menu of pizzas, find the diameter of the pizza with the lowest cost per square inch.	Easy2	ImplementationMath	No attempts yet	1s	128 MB	Judgeable
Refrigerator MagnetsRead lines until END and print each line that contains no repeated letter, ignoring spaces.	Easy2	ImplementationString+2	No attempts yet	1s	128 MB	Judgeable
VotingFor each recorded vote, check quorum and compare yes and no counts to print the outcome.	Easy2	ImplementationString	No attempts yet	1s	128 MB	Judgeable
Mirror ImageFor each word until the terminator '#', print the string reversed with each letter replaced by its mirror image, or INVALID if any letter lacks a mirror.	Easy2	StringHash map+1	No attempts yet	1s	128 MB	Judgeable
Gnome SequencingFor each of N triples of beard lengths, decide whether the three values are strictly increasing or strictly decreasing, then print Ordered or Unordered.	Easy2	ImplementationSorting+2	No attempts yet	1s	128 MB	Judgeable
Remove the DuplicatesFor each test case, collapse every run of consecutive equal numbers into a single value and print the result.	Easy2	ArrayImplementation	No attempts yet	1s	128 MB	Judgeable
Rock, Paper, ScissorsGiven two equal-length strings of R, P, S moves, count the rounds each player wins.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
ParityRead bit strings whose last bit is missing plus a parity letter, and append the 0 or 1 that makes the parity match.	Easy2	StringBit manipulation+1	No attempts yet	1s	128 MB	Judgeable
The Seven Percent SolutionRead lines until a line with only '#', replacing the seven reserved characters in each with their given percent-encodings.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
QuicksumCompute a weighted checksum for each input line: sum each character's 1-based position times its letter value, where spaces count as 0, until a line with only #.	Easy2	StringImplementation+2	No attempts yet	1s	128 MB	Judgeable
DoublesFor each list of 2 to 15 natural numbers ending in 0, count how many values x have 2x also in the same list.	Easy2	ArrayHash map+1	No attempts yet	1s	128 MB	Judgeable
Magnificent MeatballsGiven a circular list of guest meatball counts, find the position k where the sum of positions 1 through k equals the sum of the rest.	Easy2	ArrayPrefix sum+1	No attempts yet	1s	128 MB	Judgeable
Haiku ReviewCount vowel runs per haiku line and report whether each line has 5, 7, 5 syllables or the first line that fails.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
St. IvesFor each floating-point n until a terminating 0, print 1 + n + n^2 + n^3 + n^4 rounded to two decimals.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
Fifty Coats of GrayGiven room dimensions, opening sizes, and the area one can covers, compute the total paintable area for n apartments and round up to whole cans.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
Roaming RomansConvert each English-mile distance into Roman miles and paces using a fixed ratio, rounding the pace count to the nearest integer.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
The Twin ParadoxGiven Earth time and spaceship time, compute the ship's average speed as a fraction of light speed and print it to three decimals.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
Parlay WageringSimulate a sequence of parlay wagers: apply each money-line multiplier with truncation, skip ties, and format the final payout with commas.	Easy2	SimulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
A Contesting DecisionGiven each team's submissions and solve times for four problems, compute solved count and penalty, then print the winner.	Easy2	ImplementationSimulation	No attempts yet	1s	128 MB	Judgeable
Filling Out the TeamFor each player's speed, weight, and strength, print the positions whose limits the player satisfies, in table order, or No positions.	Easy2	ImplementationBrute force+1	No attempts yet	1s	128 MB	Judgeable
General Chemistry LabGiven a sequence of temperatures ending with 999, print each temperature's difference from the previous one, rounded to two decimals.	Easy2	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Financial ManagementGiven twelve monthly closing balances, compute the mean and print it rounded to the nearest penny with a dollar sign.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Cantor SetFor each N, print a line of 3^N characters following the Cantor set rule: each third-level block of size 3^k has its middle third blanked, dashes elsewhere.	Easy2	RecursionImplementation+2	No attempts yet	1s	128 MB	Judgeable
Tire DimensionsParse a tire size code and compute its overall circumference from the section width, aspect ratio, and rim diameter.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Next NumberGiven three distinct integers from an arithmetic or geometric progression, decide which type it is and print the label with the next term.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
FIFA World CupGiven groups, teams per group, advancers per group, and byes, compute total matches played plus teams padded to the next power of two.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Number Guessing GameFor each n0, report whether 3n0 is odd or even and print n4, the quotient of (n23)/9.	Easy2	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Judging OlympiaFor each line of six judge grades, discard the highest and lowest and print the average of the remaining four, stopping at the all-zero line.	Easy2	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Being Smarty!Given row R and block size N, decide whether the alternating style property P1 or P2 applies to that row.	Easy2	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
The Euclidean ClockGiven two clock times and a radius, find the area of the sector swept by the hour hand between them.	Easy2	MathGeometry+1	No attempts yet	1s	128 MB	Judgeable
ICPC Score Totalizer SoftwareFor each contestant, drop one highest and one lowest judge score, then output the truncated average of the rest.	Easy2	ImplementationSorting+2	No attempts yet	1s	128 MB	Judgeable
SavingsFor each test case, print how many years of multiplying the balance by (1 + B/100) are needed until it first exceeds M.	Easy2	SimulationMath+2	No attempts yet	1s	128 MB	Judgeable
Ah!Compare two strings of the form a...ah and print go if the first has at least as many a characters as the second.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Death Knight HeroCount how many of the given ability strings avoid the forbidden substring "CD".	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
National Collegiate Programming Contest Club FederationGiven hotels with per-person prices and weekly capacities, find the cheapest hotel and week that fit all N members within budget B.	Easy2	Brute forceImplementation	No attempts yet	1s	128 MB	Judgeable
Card CuttingRead each game line of card values up to '*', count odd values for Cheryl and even values for Tania, and print the winner or Draw.	Easy2	ImplementationString+1	No attempts yet	1s	128 MB	Judgeable
Travelling SalesmanCount the distinct town names in each week's list and report the total for that week.	Easy2	Hash mapString+1	No attempts yet	1s	128 MB	Judgeable
Jean and Joe's ClothesRead clothing sizes and count how many items go to Joe, Jean, Jane, James, or no one, per visit until N equals 0.	Easy2	ImplementationSimulation+2	No attempts yet	1s	128 MB	Judgeable
DVDsApply a series of clamped sale and restock transactions to each DVD title's stock and report the final count.	Easy2	ImplementationSimulation+2	No attempts yet	1s	128 MB	Judgeable
NoMoPhobiaFor each week, sum de-merit points for each student from misdemeanor codes and list those reaching 100, in first-appearance order.	Easy2	Hash mapImplementation	No attempts yet	1s	128 MB	Judgeable
RecipesMultiply each recipe amount by a constant and print the result as a reduced integer or mixed fraction.	Easy2	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Oil ExplorationFor each column of a grid, scan downward and sum drilling costs (H costs 3, S costs 1) until the first oil cell, or print N if none exists.	Easy2	ArraySimulation+1	No attempts yet	1s	128 MB	Judgeable
Map InterfaceGiven station coordinates and a visited sequence, count how many stations fall inside the smallest axis-aligned rectangle covering the visited stations.	Easy2	ArrayImplementation+2	No attempts yet	1s	128 MB	Judgeable
Bailout BonusGiven a list of bailed-out companies, a tax rate, and executives with company and bonus, sum the floor of the taxed fraction for executives at bailed companies.	Easy2	ImplementationHash map+2	No attempts yet	1s	128 MB	Judgeable
Isn't It Funny How a Bear Likes Honey?Given Pooh's weight and the radii of several spherical helium balloons, decide whether their combined lift strictly exceeds his weight.	Easy2	MathImplementation+2	No attempts yet	1s	128 MB	Judgeable
Contest SeatsCount how many participants fail to get their chosen seat, since only the first arrival for a seat can sit there.	Easy2	ImplementationHash map+1	No attempts yet	1s	128 MB	Judgeable
Civil EngineeringRead material densities and oblong dimensions, then sum each oblong's volume times its material density for each data set.	Easy2	ImplementationMath+2	No attempts yet	1s	128 MB	Judgeable
Aerospace & Mechanical EngineeringGiven each stage's mass, burn time, and thrust, simulate the rocket's vertical motion and report its height when the last stage falls off.	Easy2	SimulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
Alphabet DistanceFor each test case, read two equal-length uppercase words and print the alphabet distance between the paired letters at every position.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
String TransformationsApply each letter-to-two-letters rule to the first occurrence of its letter in every word, updating the word after each rule.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Error DetectionFor each 16-bit value and its transmitted check bit, decide whether the check bit matches the parity of 1-bits in the value.	Easy2	Bit manipulationImplementation	No attempts yet	1s	128 MB	Judgeable
Vigenère CipherEncrypt each given plaintext with the Vigenère cipher, shifting every letter by the aligned repeated keyword letter modulo 26.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Stacked Floating MountainsGiven several sequences, decide for each whether every element from the third onward equals the sum of the two before it.	Easy2	ImplementationArray+1	No attempts yet	1s	128 MB	Judgeable
Chess PuzzleFor each board, read the rook coordinates and report SAFE if no two rooks share a row or column, otherwise NOT SAFE.	Easy2	ImplementationHash map+2	No attempts yet	1s	128 MB	Judgeable
Checkerboard RowsFor each of B boards, read n pieces given as column-row pairs and print the largest number of pieces sharing the same row.	Easy2	ArrayHash map+1	No attempts yet	1s	128 MB	Judgeable
Counting Swann's CoinsPrint numbers 1 through N, replacing multiples of 3 with Dead, of 5 with Man, and of 15 with DeadMan, breaking the line after each word.	Easy2	ImplementationMath+1	No attempts yet	1s	128 MB	Judgeable
Fill the Rowboats!Print the numbers 1 through N, inserting the word Go! after every sixth number and after the last one.	Easy2	ImplementationSimulation+1	No attempts yet	1s	128 MB	Judgeable
Microsoft LogoPrint the Microsoft logo exactly as shown, matching every character, space, and line break.	Easy2	Implementation	No attempts yet	1s	128 MB	Judgeable
Secret LocationEach of six lines encodes one number by its character count; print the first three as Latitude and the last three as Longitude in the given format.	Easy2	StringImplementation+2	No attempts yet	1s	128 MB	Judgeable
Greatest Common DivisorRead n pairs of positive integers and print the greatest common divisor of each pair on its own line.	Easy2	MathNumber theory+1	No attempts yet	1s	128 MB	Judgeable
Least Common MultipleFor each of n test cases, read two natural numbers a and b and print their least common multiple.	Easy2	MathNumber theory+1	No attempts yet	1s	128 MB	Judgeable
J-BoxPrint an N by N grid whose border cells are '#' and interior cells are 'J', with a blank line between test cases.	Easy2	ImplementationSimulation	No attempts yet	1s	128 MB	Judgeable
Mars MathEvaluate a chain of at most three Mars operations (@, %, #) on a starting number and print the result to two decimals.	Easy2	SimulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
Letter TrianglesFor each data set, print a triangle of N lines where line i repeats the ith letter in sequence, starting from a given letter and wrapping Z to A.	Easy2	ImplementationString+1	No attempts yet	1s	128 MB	Judgeable
DedupeFor each of several strings, collapse every run of consecutive identical letters into a single letter and print the result.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Football TeamRead names one per line and swap every i with e and every I with E in each name.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Garbled MessageRead lines of garbled text until EOF and replace every occurrence of the substring "iiing" with "th", preserving all other characters and line breaks.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
YodaFor each sentence, move its first two words to the end and print the result.	Easy2	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Escape RouteGiven your position and n-1 planet positions, find the closest planet, print both coordinates, and print the distance rounded to two decimals.	Easy2	Brute forceMath+1	No attempts yet	1s	128 MB	Judgeable
Total CountRead fighter names until a line with 0, print each name with its kill count in first-appearance order, then the grand total.	Easy2	Hash mapImplementation+2	No attempts yet	1s	128 MB	Judgeable
Target PracticePrint an n by n square border with an X drawn across the inner grid using asterisks.	Easy2	ImplementationSimulation	No attempts yet	1s	128 MB	Judgeable
Which WayFor each positive integer, convert it to binary and print left, straight, or right depending on whether it has more 0s, equal 0s and 1s, or more 1s.	Easy2	Bit manipulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
Annoying MosquitosGiven up to 100 mosquito positions and up to 10000 swat centers, count how many mosquitos fall within the 101x101 square of at least one swat.	Easy2	Brute forceImplementation+1	No attempts yet	1s	256 MB	Judgeable
Vacation HomeworkGiven L vacation days and per-day limits C and D, find the most free days after finishing A Korean and B math pages.	Easy2	MathGreedy+1	No attempts yet	1s	128 MB	Judgeable
LeagueGiven every match result in a round-robin soccer league, compute each team's total points and print its rank, where tied teams share the best rank.	Easy2	ImplementationArray+2	No attempts yet	1s	128 MB	Judgeable
Dice GameSimulate a piece on a board of cells, applying a die roll then the cell's instruction, and report how many rolls reach the goal.	Easy2	SimulationArray	No attempts yet	1s	128 MB	Judgeable
Time CardGiven clock-in and clock-out times for three employees in h m s form, print each employee's working duration as hours, minutes, and seconds.	Easy2	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
ContestGiven 20 scores, split into two groups of 10, output each group's sum of its top 3 scores.	Easy2	SortingImplementation	No attempts yet	1s	128 MB	Judgeable
ChangeGiven a purchase amount below 1000 yen paid with a 1000-yen bill, find the minimum number of coins in the change.	Easy2	GreedyMath+1	No attempts yet	1s	128 MB	Judgeable
Caesar CipherGiven an uppercase word encrypted by shifting each letter forward three positions, shift every letter back by three to recover the original.	Easy2	StringImplementation+2	No attempts yet	1s	128 MB	Judgeable
Card Flipping GameGiven two rows of n digit cards, reveal pairs left to right; the larger card wins both cards' sum, and equal cards each keep their own.	Easy2	SimulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
Tunnel Entrance and ExitTrack the number of cars in a tunnel each minute from entrance and exit counts, and print the maximum count, or 0 if it ever goes negative.	Easy2	ImplementationSimulation+1	No attempts yet	1s	128 MB	Judgeable
Triangle Validity and ClassificationRead lines of three side lengths, count valid triangles as right, acute, or obtuse, and stop at the first line that is not a triangle.	Easy2	ImplementationMath+2	No attempts yet	1s	128 MB	Judgeable
BirthdayGiven each student's name and birthday, print the name of the youngest student, then the oldest.	Easy2	ImplementationSorting+1	No attempts yet	1s	128 MB	Judgeable
Comparison OperatorsRead C comparison expressions with integer operands, evaluate each, and print "Case N: true" or "Case N: false" until a line with operator E ends input.	Easy2	ImplementationString+1	No attempts yet	1s	128 MB	Judgeable
BakuganGiven each player's monster sequence over at most 10 rounds, add points per round and award a one-time 30-point bonus for the first three-in-a-row, then name the winner.	Easy2	ImplementationSimulation	No attempts yet	1s	128 MB	Judgeable
Hailstone SequencesFor each starting value H up to 500, simulate the Collatz rule and print the largest number that appears before reaching 1.	Easy2	SimulationImplementation+1	No attempts yet	1s	128 MB	Judgeable
Factorial BaseRead each factorial-base number, weight digit at position i (from the right, 1-indexed) by i!, and print the decimal value.	Easy2	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
PangramRead sentences until a line holding a single asterisk, and print Y if a sentence contains all 26 lowercase letters, otherwise N.	Easy2	StringHash map+1	No attempts yet	1s	128 MB	Judgeable
Jingle ComposingSplit a slash-delimited composition into measures and count how many note durations sum exactly to 1.	Easy2	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
FeynmanFor each N, count all axis-aligned squares contained in an N by N grid of unit cells, ending at the sentinel 0.	Easy2	MathImplementation	No attempts yet	1s	128 MB	Judgeable
Weekend LotteryGiven N past draws of C distinct numbers from 1 to K, print all numbers that appeared the fewest times, in increasing order.	Easy2	ArrayImplementation	No attempts yet	3s	128 MB	Judgeable
Head or TailFor each test case, count the zeros and ones in the list of game results and print how many games Mary and John each won.	Easy2	ImplementationArray+1	No attempts yet	1s	128 MB	Judgeable
Pascal LibraryGiven D attendance rows over N alumni, decide whether some alumnus attended every dinner.	Easy2	ArrayImplementation+1	No attempts yet	1s	128 MB	Judgeable
Grade StatisticsFor each class, read the scores, then report the maximum, the minimum, and the largest gap between neighboring scores after sorting in descending order.	Easy2	SortingImplementation+1	No attempts yet	1s	128 MB	Judgeable
Roll-call in Woop Woop HighRead each class's answers and count pupils into four groups: correct first try, correct late, never correct, and absent.	Easy2	ImplementationString+1	No attempts yet	1s	128 MB	Judgeable
Breed ProximityGiven a line of N cows with breed ids, find the largest breed id whose two occurrences lie within K positions of each other, or -1 if none exist.	Easy2	ArrayHash map+1	No attempts yet	1s	128 MB	Judgeable
Contest TimingShe starts at 11:11 on 11/11. Given the day, hour, and minute she stops, print the minutes elapsed, or -1 if the stop is earlier.	Easy2	MathImplementation+1	No attempts yet	1s	128 MB	Judgeable
Math PracticeGiven A (0 to 45) and B (1 to 9), find the smallest E in 1 to 62 with E > A and 2^E starting with digit B, or 0 if none exists.	Easy2	MathBrute force+1	No attempts yet	1s	128 MB	Judgeable
String Function EncodingApply the given suffix-plus-string operation C times to each input string and print the results.	Easy2	StringSimulation	No attempts yet	1s	128 MB	Judgeable