Strings and text

Parsing, matching, and tries

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Total results3,614 problems

Östgötska
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Tapioka
Easy2
String, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Time
Easy2
Brute force, Implementation+2
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Lucky Straight
Easy2
String, Implementation+2
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Capitalization
Easy2
String, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Banana
Easy2
Hash map, String+2
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Divisionals Spelling
Easy2
Implementation, String+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Time to get up!
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Rebus
Easy2
String, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Sator Square
Easy2
Implementation, Array+1
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Recommend the Next Morgorithm President
Easy2
Implementation, Sorting+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Big Money
Easy2
Math, Implementation+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Counting Monuments
Easy2
Hash map, String+1
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Triple Texting
Easy2
String, Implementation
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Fifty Shades of Pink
Easy2
String, Implementation+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Consonant Collapse
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
JOI Sort
Easy2
Sorting, Implementation+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Methodic Multiplication
Easy2
String, Math+2
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Missing Number
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Mars Message
Easy2
Implementation, String+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Making a Cipher
Easy2
String, Implementation
No attempts yet
Time limit
0.5s
Memory limit
256 MB
Judgeable
Secret Instructions
Easy2
Implementation, Simulation+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Misha and the Negative
Easy2
Implementation, Array+2
No attempts yet
Time limit
2s
Memory limit
512 MB
Judgeable
Split
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Scroll
Easy2
String, Implementation+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Binary Division
Easy2
Math, String+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Formatting Text
Easy2
String, Implementation+2
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Hongik Dance Party
Easy2
Implementation, String+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
JavaScript
Easy2
String, Implementation+2
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
QuackQuack (Easy)
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Dickensian Dictionary
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Kinder Surprise
Easy2
Hash map, String
No attempts yet
Time limit
1s
Memory limit
64 MB
Judgeable
Ресторан
Easy2
Implementation, String+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Drawing Snail - ㄴ
Easy2
Implementation, String+2
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Saturnalia
Easy2
Implementation, String+1
No attempts yet
Time limit
20s
Memory limit
1024 MB
Judgeable
Bitaro and IOI
Easy2
String, Greedy+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
IOI String
Easy2
String, Implementation+2
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Hidden Words
Easy2
String, Simulation+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Numbers Between Characters
Easy2
String, Implementation+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Eye of Sauron
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Dodo Learns Time Complexity
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Harp Tuning
Easy2
String, Implementation+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Ultimate Binary Watch
Easy2
Bit manipulation, Implementation+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Average Character
Easy2
String, Math+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Blocks
Easy2
Backtracking, Brute force+2
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Good Messages
Easy2
String, Simulation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Punched Cards
Easy2
Implementation, String
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
KHL
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
TiM
Easy2
String, Implementation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
One Shot at Life
Easy2
String, Simulation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Brexiting and Brentering
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Coding Is a Physical Education Subject
Easy2
String, Implementation
No attempts yet
Time limit
0.5s
Memory limit
1024 MB
Judgeable
Measuring Student Popularity
Easy2
Hash map, Sorting+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Linked Master Ims
Easy2
String, Simulation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Palindrome Sotteok-Sotteok
Easy2
String, Two pointers
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Number Maximization
Easy2
Sorting, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Easy-to-Pronounce Words
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Odd/Even Strings
Easy2
String, Hash map
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Changing Strings
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Judging Assistant for Contest
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
SGA President
Easy2
Hash map, String+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Simplified Keyboard
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Polar Bear Tears Brackets
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
HI-ARC
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Similar Phone Numbers
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Chicken Dance Gomgomi Ims 2
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Identify, Sort, Index, Solve
Easy2
Sorting, Implementation+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Finding Maximal Non-Trivial Monotones
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Big Data? Information Security!
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
256 MB
Judgeable
Mentors and Mentees
Easy2
Sorting, String
No attempts yet
Time limit
2s
Memory limit
256 MB
Judgeable
Vowel Count
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Big Number
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Reverse
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Square
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Presidents
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Date
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Palindrome
Easy2
Two pointers, String
No attempts yet
Time limit
5s
Memory limit
4 MB
Judgeable
A+B
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Oczko
Easy2
Implementation, String
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Horizontal Hearts
Easy2
Implementation, String
No attempts yet
Time limit
5s
Memory limit
1024 MB
Judgeable
Alternating word
Easy2
String, Greedy
No attempts yet
Time limit
4s
Memory limit
1024 MB
Judgeable
Kent-buggen
Easy2
Hash map, String
No attempts yet
Time limit
6s
Memory limit
1024 MB
Judgeable
Viking Hackers
Easy2
Hash map, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Skolvägen
Easy2
String, Greedy
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Vertical Histogram
Easy2
Array, Implementation+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Square Designs
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Word Diamonds
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Adjacent Colors
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Old English
Easy2
String, Implementation
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
JOI Editor
Easy2
String, Simulation
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Class Field Trip
Easy2
Sorting, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Splitology
Easy2
String, Brute force
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Encrypted School Name
Easy2
Implementation, Brute force+1
No attempts yet
Time limit
1s
Memory limit
512 MB
Judgeable
Orange Eaten Long Ago
Easy2
Brute force, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Quattro Cheese Pizza
Easy2
String, Hash map+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Naming the Team
Easy2
Implementation, Sorting+1
No attempts yet
Time limit
2s
Memory limit
1024 MB
Judgeable
Since 1973
Easy2
Implementation, Brute force+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Three-Tier Chocolate Ice Cream
Easy2
Implementation, String+1
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
in-out? out-in? stairs? reverse?
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable
Word Chain
Easy2
Implementation, String
No attempts yet
Time limit
1s
Memory limit
1024 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
ÖstgötskaCount how many space-separated words contain the substring "ae"; if that count is at least 40 percent of the words, print one fixed phrase, otherwise the other.	Easy2	StringImplementation+1	No attempts yet	1s	512 MB	Judgeable
TapiokaGiven a three-word dish name, remove the words "bubble" and "tapioka", then print the remaining words or "nothing" if none remain.	Easy2	StringImplementation	No attempts yet	2s	1024 MB	Judgeable
TimeCount how many clock times from 00:00:00 through N:59:59 contain the digit K at least once.	Easy2	Brute forceImplementation+2	No attempts yet	1s	256 MB	Judgeable
Lucky StraightGiven an even-length number, decide whether the sum of its left-half digits equals the sum of its right-half digits, printing LUCKY or READY.	Easy2	StringImplementation+2	No attempts yet	1s	256 MB	Judgeable
CapitalizationReplace every occurrence of the substring "joi" in a lowercase string with "JOI" and print the result.	Easy2	StringImplementation	No attempts yet	2s	512 MB	Judgeable
BananaRead a dictionary mapping English words to Minionese words, then translate each of T sentences word by word.	Easy2	Hash mapString+2	No attempts yet	2s	512 MB	Judgeable
Divisionals SpellingGiven n words and a contest with m questions labeled A onward, count how many words use only distinct letters from the first m letters.	Easy2	ImplementationString+1	No attempts yet	1s	512 MB	Judgeable
Time to get up!Given a 7x21 ASCII image of a 7-segment clock for each test case, print the displayed time as HH:MM.	Easy2	ImplementationString	No attempts yet	1s	512 MB	Judgeable
RebusSplit the input into space-separated words, strip leading and trailing apostrophes by removing that many letters from each end, then concatenate the pieces.	Easy2	StringImplementation	No attempts yet	2s	512 MB	Judgeable
Sator SquareGiven an N by N grid of letters, check whether it reads the same horizontally and vertically, printing YES or NO.	Easy2	ImplementationArray+1	No attempts yet	1s	256 MB	Judgeable
Recommend the Next Morgorithm PresidentGiven N distinct names with scores, print the name with the highest score, breaking ties by lexicographically smallest name.	Easy2	ImplementationSorting+1	No attempts yet	1s	1024 MB	Judgeable
Big MoneySum n decimal amounts given in euros with two cent digits each, and print the exact total in the same format.	Easy2	MathImplementation+1	No attempts yet	1s	512 MB	Judgeable
Counting MonumentsRead n lines, each with a date and a monument name, and output the number of distinct monument names.	Easy2	Hash mapString+1	No attempts yet	2s	512 MB	Judgeable
Triple TextingGiven a string formed by writing a word three times with at most one letter changed, recover the original word.	Easy2	StringImplementation	No attempts yet	2s	512 MB	Judgeable
Fifty Shades of PinkCount how many of N color names contain "pink" or "rose" ignoring case; if the count is zero, print a fixed excuse string instead.	Easy2	StringImplementation+2	No attempts yet	1s	1024 MB	Judgeable
Consonant CollapseGiven a line of lowercase letters and single spaces, collapse any run of three or more identical consonants down to two, leaving everything else unchanged.	Easy2	StringImplementation+1	No attempts yet	1s	1024 MB	Judgeable
JOI SortGiven a string of J, O, and I characters, rearrange it so every J precedes every O, and every O precedes every I.	Easy2	SortingImplementation+1	No attempts yet	2s	1024 MB	Judgeable
Methodic MultiplicationRead two Peano-encoded natural numbers and print their product, also in Peano form.	Easy2	StringMath+2	No attempts yet	2s	1024 MB	Judgeable
Missing NumberA string lists the numbers 1 to n in order with one number erased; find the missing value.	Easy2	StringImplementation+1	No attempts yet	1s	512 MB	Judgeable
Mars MessageRead N angles, map each to a hex digit by which 22.5 degree sector it falls in, pair them into ASCII codes, and print the decoded text.	Easy2	ImplementationString+2	No attempts yet	1s	1024 MB	Judgeable
Making a CipherGiven strings A and P, find a string B of length at most 100 so that P is the only length-\|P\| substring that A and B share.	Easy2	StringImplementation	No attempts yet	0.5s	256 MB	Judgeable
Secret InstructionsDecode a list of five-digit instructions into left or right turns with step counts, carrying the previous direction when the first two digits sum to zero.	Easy2	ImplementationSimulation+2	No attempts yet	1s	1024 MB	Judgeable
Misha and the NegativeGiven two binary black-and-white images of the same size, count the pixels where the second image does not equal the negative of the first.	Easy2	ImplementationArray+2	No attempts yet	2s	512 MB	Judgeable
SplitGiven an even-length number, split it into two equal halves and print the two numbers.	Easy2	StringImplementation	No attempts yet	1s	512 MB	Judgeable
ScrollGiven a string T and an index K, swap the case of every character from position K onward to recover the original string S.	Easy2	StringImplementation+1	No attempts yet	2s	1024 MB	Judgeable
Binary DivisionGiven a binary string M and an integer K, decide whether M is divisible by 2^K.	Easy2	MathString+1	No attempts yet	1s	1024 MB	Judgeable
Formatting TextRead whitespace-separated tokens until END, printing each normal token followed by a space and a newline for each N token.	Easy2	StringImplementation+2	No attempts yet	2s	1024 MB	Judgeable
Hongik Dance PartyGiven five lines of characters forming a 5-column-wide photograph, swap the two characters that mark the Ready to Leap and Leaping states, and print the resulting lines.	Easy2	ImplementationString+2	No attempts yet	1s	1024 MB	Judgeable
JavaScriptRead two short strings and print the JavaScript result of x - y, which is NaN if either string is not a valid number, otherwise their numeric difference.	Easy2	StringImplementation+2	No attempts yet	2s	1024 MB	Judgeable
QuackQuack (Easy)Print a string of q's and a's within a 100000 step budget, where the step count depends on the exact characters chosen.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Dickensian DictionaryGiven a lowercase word, decide whether the hands typing its letters alternate between left and right on every step.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Kinder SurpriseGiven n hippo statuette names with some repeats, output how many of the n statuettes are still missing, which is n minus the number of distinct names.	Easy2	Hash mapString	No attempts yet	1s	64 MB	Judgeable
РесторанGiven a word of English capital letters that look like Russian ones, print its pronunciation using the seven letters that sound different.	Easy2	ImplementationString+1	No attempts yet	1s	1024 MB	Judgeable
Drawing Snail - ㄴGiven an integer N, print a snail-shaped figure made of 5 by 5 cells where each cell is N characters wide.	Easy2	ImplementationString+2	No attempts yet	1s	512 MB	Judgeable
SaturnaliaFor each message, print a case label and a three line box of '+', '-', and '\|' characters with the message padded by one space on each side.	Easy2	ImplementationString+1	No attempts yet	20s	1024 MB	Judgeable
Bitaro and IOIGiven a short string over B, I, T, A, R, O, decide whether it contains the subsequence I, O, I in order.	Easy2	StringGreedy+1	No attempts yet	2s	1024 MB	Judgeable
IOI StringGiven an odd-length uppercase string S, find the minimum number of single-character changes needed to make it an alternating I/O string starting with I.	Easy2	StringImplementation+2	No attempts yet	2s	1024 MB	Judgeable
Hidden WordsStarting from the first character, each letter tells how many positions ahead the next character is; output every visited character.	Easy2	StringSimulation+1	No attempts yet	2s	1024 MB	Judgeable
Numbers Between CharactersRead an integer N and a four-character string, then print N times each digit found, or N/A if there are no digits.	Easy2	StringImplementation+1	No attempts yet	2s	1024 MB	Judgeable
Eye of SauronGiven a string of bars surrounding a single matched pair of parentheses, decide whether the bar counts on the left and right sides are equal.	Easy2	StringImplementation+1	No attempts yet	1s	1024 MB	Judgeable
Dodo Learns Time ComplexityGiven lines of lowercase text, count how many times the substrings "for" and "while" appear on each line and print the largest count.	Easy2	StringImplementation+1	No attempts yet	1s	1024 MB	Judgeable
Harp TuningSplit one line of concatenated harp tuning instructions into separate lines showing the strings, tighten or loosen, and the turn count.	Easy2	StringImplementation+1	No attempts yet	1s	1024 MB	Judgeable
Ultimate Binary WatchGiven a 24-hour time as four digits, print a four-column binary LED watch face with asterisks for set bits and periods for clear bits.	Easy2	Bit manipulationImplementation+2	No attempts yet	1s	1024 MB	Judgeable
Average CharacterGiven a printable ASCII string, output the character whose ASCII value is the floor of the average of all characters' ASCII values.	Easy2	StringMath+1	No attempts yet	1s	1024 MB	Judgeable
BlocksGiven four blocks with six letters each, decide for each short word whether its letters can be assigned to distinct blocks that contain them.	Easy2	BacktrackingBrute force+2	No attempts yet	1s	1024 MB	Judgeable
Good MessagesApplies a Caesar shift to a message up to N times and counts steps where vowels (including y) are at least half the consonants, printing Boris or Colleague.	Easy2	StringSimulation	No attempts yet	1s	1024 MB	Judgeable
Punched CardsGiven R and C, print an ASCII punched card with R rows and C columns, where each cell is a period inside a border of dashes, pipes, and plus signs.	Easy2	ImplementationString	No attempts yet	5s	1024 MB	Judgeable
KHLGiven N game results with period, overtime, and shootout scores, compute the total points Medveščak earns across all games.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
TiMGiven the characters of an alternating X or number and +/- expression, output the digit sum, the sum of the numbers, and the X value that makes it zero.	Easy2	StringImplementation	No attempts yet	2s	1024 MB	Judgeable
One Shot at LifeDecide whether a string of uppercase letters has a run of 5 or more characters where each adjacent pair is alphabetically consecutive.	Easy2	StringSimulation	No attempts yet	1s	1024 MB	Judgeable
Brexiting and BrenteringFind the last vowel in a name, cut the string after it, and append "ntry" to form the entering term.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Coding Is a Physical Education SubjectGiven N, a multiple of 4, print the C++ integer type name with N/4 copies of "long" followed by "int" that can store up to N bytes.	Easy2	StringImplementation	No attempts yet	0.5s	1024 MB	Judgeable
Measuring Student PopularityGiven n student names and each student's list of liked classmates, count how many students like each name and print the names sorted by count descending, then by name ascending.	Easy2	Hash mapSorting+1	No attempts yet	1s	512 MB	Judgeable
Linked Master ImsCount the skills that fire normally, where each R or K pairs with an earlier unused L or S, and an unmatched main skill breaks all later skills.	Easy2	StringSimulation	No attempts yet	1s	1024 MB	Judgeable
Palindrome Sotteok-SotteokGiven a string of 's' and 't', find the minimum number of single-character changes needed to make it a palindrome.	Easy2	StringTwo pointers	No attempts yet	1s	512 MB	Judgeable
Number MaximizationGiven an integer of up to six digits, rearrange its digits to form the largest number possible.	Easy2	SortingString	No attempts yet	1s	1024 MB	Judgeable
Easy-to-Pronounce WordsGiven a lowercase word, print 1 if its vowels and consonants strictly alternate, and 0 otherwise.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Odd/Even StringsGiven a lowercase string, decide whether every letter appears an even number of times, every letter an odd number of times, or neither.	Easy2	StringHash map	No attempts yet	1s	1024 MB	Judgeable
Changing StringsGiven an uppercase string, replace characters outside the leftmost U to rightmost F span with hyphens and those inside with C.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Judging Assistant for ContestGiven a submission's filename, return code, timing, and output, print one of five verdicts for it.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
SGA PresidentGiven n first names, count ordered pairs of names with different spellings that start with the same letter.	Easy2	Hash mapString+1	No attempts yet	1s	1024 MB	Judgeable
Simplified KeyboardGiven two lowercase words, decide whether they are identical, similar (same length, each letter matches or is a keyboard neighbor), or different.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Polar Bear Tears BracketsGiven a bracket string S of length N, find the fewest days Hyeop needs to build it by inserting O or X each night, or print -1 if it cannot be built.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
HI-ARCGiven a string of uppercase letters, find how many complete sets of H, I, A, R, and C can be taken to make HI-ARC emojis.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Similar Phone NumbersCount the space-separated phone numbers in A that start with B and are not equal to B.	Easy2	StringImplementation	No attempts yet	1s	512 MB	Judgeable
Chicken Dance Gomgomi Ims 2Given N gifticons with remaining validity written as D-x, count how many have x of 90 or less.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
Identify, Sort, Index, SolveGiven N problem titles with numbers and difficulties, sort them by number and output the uppercased D-th character of each title in that order.	Easy2	SortingImplementation+1	No attempts yet	1s	512 MB	Judgeable
Finding Maximal Non-Trivial MonotonesGiven a string of a and b characters, count the a characters that lie in maximal runs of equal letters with length at least 2.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Big Data? Information Security!Given a string that concatenates the words bigdata and security, count each word's occurrences and print which one appears more often, or that they tie.	Easy2	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Mentors and MenteesSort mentor-mentee pairs by mentor in dictionary order, and break ties by mentee in reverse dictionary order.	Easy2	SortingString	No attempts yet	2s	256 MB	Judgeable
Vowel CountFor each lowercase name, print the name, then 1 if it has more vowels (aeiou) than consonants, otherwise 0.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Big NumberGiven a positive integer, the task prints each digit as a 4-row block drawn from a fixed font, with a blank line between digits.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
ReverseGiven several strings with indices i and j, print each string with the characters from index i up to j-1 removed.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
SquareGiven words, print a square where each row is the word cyclically shifted one more position than the row above it.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
PresidentsRead n lines of president last names, map each name to its bill value, and output the total dollar amount in the wallet.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
DateConvert each Month Day, Year date to MM/DD/YY, printing Invalid when the month name is misspelled or the day is outside 1 to 31.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
PalindromeRead a lowercase word of unknown or known length and print TAK if it is a palindrome, otherwise NIE, using little memory.	Easy2	Two pointersString	No attempts yet	5s	4 MB	Judgeable
A+BGiven two positive integers a and b with at most 5000 digits each, print their sum.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
OczkoGiven each player's card string, find the players who reach the highest score not exceeding 21, counting each Ace as 1 or 11.	Easy2	ImplementationString	No attempts yet	2s	1024 MB	Judgeable
Horizontal HeartsPrint N ASCII hearts made of at signs, placed side by side with exactly one space between each pair.	Easy2	ImplementationString	No attempts yet	5s	1024 MB	Judgeable
Alternating wordGiven a string, find the fewest letters to delete so that no two adjacent remaining letters are equal.	Easy2	StringGreedy	No attempts yet	4s	1024 MB	Judgeable
Kent-buggenGiven n artist names, count how many distinct names appear more than once.	Easy2	Hash mapString	No attempts yet	6s	1024 MB	Judgeable
Viking HackersSplit a binary string into 4-bit chunks, map each chunk to its character using a lookup table, and print ? for chunks with no match.	Easy2	Hash mapString	No attempts yet	1s	1024 MB	Judgeable
SkolvägenGiven a string of N, S, and B intersections, find the minimum number of side streets Cissi must cross walking from home to school on the north side.	Easy2	StringGreedy	No attempts yet	1s	1024 MB	Judgeable
Vertical HistogramCount how many times each capital letter appears in four input lines and print a vertical asterisk histogram with the alphabet below.	Easy2	ArrayImplementation+1	No attempts yet	1s	1024 MB	Judgeable
Square DesignsGiven M and N, print two square boxes side by side, the left with M cells across and the right with N, drawn with plus, minus, and I characters.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
Word DiamondsGiven a word whose first and last letters match, print its word diamond, with the letters spreading out from the top and bottom to the middle row.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
Adjacent ColorsFor each circular string of R, G, and B beads, find the color pair that is adjacent most often, printing every pair that ties for the maximum.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
Old EnglishTranslate each word by replacing s, a leading e, and oo according to three rules while keeping the case of the first letter.	Easy2	StringImplementation	No attempts yet	1s	1024 MB	Judgeable
JOI EditorGiven a sequence of j, o, and i key presses, the task is to output the final text after each adjacent pair of identical lowercase letters becomes uppercase.	Easy2	StringSimulation	No attempts yet	2s	1024 MB	Judgeable
Class Field TripGiven two sorted lowercase strings, print one string that contains all their letters in alphabetical order.	Easy2	SortingString	No attempts yet	1s	1024 MB	Judgeable
SplitologyGiven a lowercase string of length up to 500, find a split into two non-empty palindromes, or report NO if none exists.	Easy2	StringBrute force	No attempts yet	1s	1024 MB	Judgeable
Encrypted School NameGiven an encrypted school name, find which of four schools it came from by trying all 26 possible shifts of its processed name.	Easy2	ImplementationBrute force+1	No attempts yet	1s	512 MB	Judgeable
Orange Eaten Long AgoGiven a string, decide whether some length L makes the prefix of length L and the suffix of length L differ in exactly one position.	Easy2	Brute forceString	No attempts yet	1s	1024 MB	Judgeable
Quattro Cheese PizzaCheck whether the toppings include at least four different ones whose names end with Cheese, counting case-sensitively.	Easy2	StringHash map+1	No attempts yet	1s	1024 MB	Judgeable
Naming the TeamGiven three members' solved counts, admission years, and surnames, print a name from the years mod 100 sorted ascending and another from surname initials sorted by solved count.	Easy2	ImplementationSorting+1	No attempts yet	2s	1024 MB	Judgeable
Since 1973Numbers are counted from 1, with any number containing 50 counted twice. Find the position where N first appears in this sequence.	Easy2	ImplementationBrute force+1	No attempts yet	1s	1024 MB	Judgeable
Three-Tier Chocolate Ice CreamGiven uppercase strings, decide whether each one matches one of four three-part patterns built from a prefix of length ceil(n/3) and its reverse.	Easy2	ImplementationString+1	No attempts yet	1s	1024 MB	Judgeable
in-out? out-in? stairs? reverse?Given a string that is a permutation of the eight keys a s d f j k l ;, decide whether it is in-out, out-in, stairs, reverse, or none of these.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable
Word ChainGiven a word chain record with one hidden word and a list of candidates, find the candidate that makes the chain valid with no repeated words.	Easy2	ImplementationString	No attempts yet	1s	1024 MB	Judgeable