Strings and text

Parsing, matching, and tries

Under construction

Still being built. Things may change

Total results3,133 problems

Palindrome NumbersEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Counting VowelsEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
QuackEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
CrowingEasy1
Implementation, StringNo 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
String RepetitionEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Typo Man Go ChangyoungEasy1
String, 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
Beautiful NumberEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Study Abroad BanEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
FBIEasy1
String, ImplementationNo attempts yetTime limit0.25sMemory limit128 MB
Judgeable
Sum of Missing CharactersEasy1
String, Hash map +1No 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
Mirror, Oh! MirrorEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Counting LinesEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
PhD ProgramEasy1
Implementation, StringNo 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
Entry Log ManagementEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
JOI and IOIEasy1
String, Brute force +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Do-it, Do-it-NotEasy1
String, Implementation +1No attempts yetTime limit1sMemory limit128 MB
Judgeable
Reverse TextEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
The Universal OracleEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
DyslexiaEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
DyslexiaEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Reverse a Three-Letter WordEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Letter CounterEasy1
Array, StringNo attempts yetTime limit1sMemory limit512 MB
Judgeable
Caesar CipherEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
OX QuizEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Letter BankEasy1
Hash map, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
First and Last LetterEasy1
StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Reverse Each WordEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Erasing a File for GoodEasy1
Simulation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
JengaEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Grading ExamsEasy1
StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Fraud BustersEasy1
String matching, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Encoding Binary NumbersEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Gray codeEasy1
Bit manipulation, StringNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Hide those lettersEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
AcronymsEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Count VowelsEasy1
StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Reverse RotEasy1
String, SimulationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Quite a problemEasy1
String matching, StringNo attempts yetTime limit2sMemory limit256 MB
Judgeable
Happy or SadEasy1
StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Vertical ReadingEasy1
Simulation, Array +1No attempts yetTime limit1sMemory limit256 MB
Judgeable
Find the AlphabetEasy1
Array, StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
String analysisEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Comma Integer CountEasy1
StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Comma Sum MultilineEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
??!Easy1
StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
BASE16 EncodingEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
BASE16 DecodingEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Vowel CountEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Palindrome CheckEasy1
String, Two pointersNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Use Every LetterEasy1
String, ArrayNo attempts yetTime limit2sMemory limit256 MB
Judgeable
Simon SaysEasy1
String, ImplementationNo attempts yetTime limit2sMemory limit256 MB
Judgeable
Communication ChannelsEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Angry Grammar SticklerEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Thai Lottery Prize CheckEasy1
String, ImplementationNo attempts yetTime limit2sMemory limit256 MB
Judgeable
Cryptographer's ConundrumEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Count Me InEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
!terces poTEasy1
StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
The Image Stretched Twice as WideEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit512 MB
Judgeable
Concatenate two linesEasy1
StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Lining Up by NameEasy1
String, ArrayNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Affine CipherEasy1
Implementation, String +1No attempts yetTime limit5sMemory limit256 MB
Judgeable
ROT13Easy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Sum of digitsEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Print ten characters per lineEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
EssayEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit64 MB
Judgeable
NNEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit32 MB
Judgeable
Rulers of Centauri PrimeEasy1
String, ImplementationNo attempts yetTime limit5sMemory limit512 MB
Judgeable
Rulers of Centauri PrimeEasy1
String, ImplementationNo attempts yetTime limit5sMemory limit512 MB
Judgeable
KBO Korean Series Champion NumberEasy1
Implementation, String +1No attempts yetTime limit2sMemory limit512 MB
Judgeable
George BooleEasy1
Implementation, String +2No attempts yetTime limit2sMemory limit512 MB
Judgeable
Java2016Easy1
Implementation, Simulation +2No attempts yetTime limit2sMemory limit512 MB
Judgeable
HistogramEasy1
Implementation, StringNo attempts yetTime limit2sMemory limit512 MB
Judgeable
Tournament SelectionEasy1
Implementation, StringNo attempts yetTime limit2sMemory limit512 MB
Judgeable
HelicopterEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit512 MB
Judgeable
A toast that wins over the roomEasy1
Implementation, String +1No attempts yetTime limit2sMemory limit512 MB
Judgeable
CAPSEasy1
String, ImplementationNo attempts yetTime limit2sMemory limit512 MB
Judgeable
What Is Your Name Score?Easy1
String, ImplementationNo attempts yetTime limit1sMemory limit128 MB
Judgeable
Serious ProblemEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit256 MB
Judgeable
Is it rated?Easy1
Implementation, StringNo attempts yetTime limit1sMemory limit512 MB
Judgeable
EmojiEasy1
String, Implementation +1No attempts yetTime limit1sMemory limit512 MB
Judgeable
Greetings!Easy1
String, ImplementationNo attempts yetTime limit1sMemory limit512 MB
Judgeable
Animal King ElectionEasy1
Implementation, StringNo attempts yetTime limit1sMemory limit512 MB
Judgeable
Extreme TemperaturesEasy1
Implementation, Array +2No attempts yetTime limit2sMemory limit512 MB
Judgeable
Counting VowelsEasy1
String, ImplementationNo attempts yetTime limit2sMemory limit512 MB
Judgeable
Inversion of a StringEasy1
String, ImplementationNo attempts yetTime limit2sMemory limit512 MB
Judgeable
The Walking AdamEasy1
String, Implementation +1No attempts yetTime limit2sMemory limit512 MB
Judgeable
TimecardEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit512 MB
Judgeable
Yeongil's Ideal TypeEasy1
String, Implementation +1No attempts yetTime limit1sMemory limit512 MB
Judgeable
Java BitecodeEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit1024 MB
Judgeable
Sunrin Internet High School AnthemEasy1
String, ImplementationNo attempts yetTime limit1sMemory limit512 MB
Judgeable
D2Easy1
String, String matchingNo attempts yetTime limit2.222sMemory limit222 MB
Judgeable

Title	Level	Topics	Solved	Time limit	Memory limit	Judge
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
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
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
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
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
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
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
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
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
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
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
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
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
Entry Log ManagementRead N names and print each one converted to lowercase, one per line.	Easy1	StringImplementation	No attempts yet	1s	256 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
Do-it, Do-it-NotFor each test case, compare the two middle digits of an even-length binary string and print Do-it if they match, otherwise Do-it-Not.	Easy1	StringImplementation+1	No attempts yet	1s	128 MB	Judgeable
Reverse TextRead each test case line and print its characters in reverse order.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
The Universal OracleGiven one line of text, replace each question's leading 'What' with 'Forty-two' and its final '?' with '.', ignoring non-questions.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
DyslexiaCompare two equal-length letter strings position by position and count the positions where the characters differ, treating case as significant.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
DyslexiaCompare two equal-length strings character by character and count positions where the letters match exactly, including case.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Reverse a Three-Letter WordRead a three-letter word and print its characters in reverse order.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Letter CounterCount how many times each letter appears across the given lines and print nonzero counts from a to z then A to Z.	Easy1	ArrayString	No attempts yet	1s	512 MB	Judgeable
Caesar CipherGiven the encrypted message and its original first letter, recover the shift and decode the full message.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
OX QuizScore each O by the length of its unbroken run of O characters and print the total for each test case.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
Letter BankDecide whether the second word uses exactly the letters of the first word, each at least once.	Easy1	Hash mapString	No attempts yet	1s	128 MB	Judgeable
First and Last LetterPrint the first and last letter of each given uppercase string, doubling the letter for length 1.	Easy1	String	No attempts yet	1s	128 MB	Judgeable
Reverse Each WordFor each of T sentences, print the words in the same order with the letters inside every word reversed.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Erasing a File for GoodDecide if the second bit string is the first with every bit flipped N times, so it must equal the first for even N and its complement for odd N.	Easy1	SimulationString	No attempts yet	1s	128 MB	Judgeable
JengaCheck each three-block row for two adjacent missing blocks and report whether each tower stands.	Easy1	ImplementationString	No attempts yet	1s	128 MB	Judgeable
Grading ExamsCount how many answers differ between the answer key and the student's responses for each test case.	Easy1	String	No attempts yet	1s	128 MB	Judgeable
Fraud BustersMatch each 9-character database code against the scanned code, treating every star as a wildcard, and print the matches in input order.	Easy1	String matchingImplementation	No attempts yet	1s	128 MB	Judgeable
Encoding Binary NumbersEncode each binary string as run lengths followed by digits and print the result per line.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
Gray codeConvert an n-bit binary string to its standard Gray code by copying the first bit and adding each adjacent pair of bits without carry.	Easy1	Bit manipulationString	No attempts yet	1s	128 MB	Judgeable
Hide those lettersThe program replaces every occurrence of two given letters in both cases with underscores.	Easy1	StringImplementation	No attempts yet	1s	128 MB	Judgeable
AcronymsGiven an acronym and candidate phrases, print the phrases whose word initials match the acronym letters in order.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Count VowelsCount the vowels a, e, i, o, and u in each given lowercase word and print the result in the required sentence.	Easy1	String	No attempts yet	1s	256 MB	Judgeable
Reverse RotReverse each message, then shift every character forward by N places in the 28-symbol alphabet.	Easy1	StringSimulation	No attempts yet	1s	256 MB	Judgeable
Quite a problemPrint yes for each input line that contains problem in any capitalization, even inside longer words, and no otherwise.	Easy1	String matchingString	No attempts yet	2s	256 MB	Judgeable
Happy or SadCount the happy (:-)) and sad (:-( ) emoticons in the message and print happy, sad, unsure, or none.	Easy1	String	No attempts yet	1s	256 MB	Judgeable
Vertical ReadingRead five given words column by column from top to bottom, skipping missing letters in shorter words, and print the letters in that order.	Easy1	SimulationArray+1	No attempts yet	1s	256 MB	Judgeable
Find the AlphabetGiven a lowercase word of length at most 100, output the 0-based first index of each letter a to z, or -1 when absent.	Easy1	ArrayString	No attempts yet	1s	256 MB	Judgeable
String analysisCount the lowercase letters, uppercase letters, digits, and spaces in each input line until end of input.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Comma Integer CountCount the maximal runs of digits in a comma-separated digit string.	Easy1	String	No attempts yet	1s	256 MB	Judgeable
Comma Sum MultilineJoin the input lines into one comma-separated string, split it at commas, and print the sum of the numbers.	Easy1	ImplementationString	No attempts yet	1s	256 MB	Judgeable
??!Print the given id with ??! appended to it.	Easy1	String	No attempts yet	1s	256 MB	Judgeable
BASE16 EncodingRead a string of up to 50 letters and digits and print each character as two uppercase hex digits in order.	Easy1	ImplementationString	No attempts yet	1s	256 MB	Judgeable
BASE16 DecodingDecode a BASE16 string by converting each pair of hex digits back into its ASCII character.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Vowel CountCount how many letters of the given lowercase word are vowels (a, e, i, o, u).	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Palindrome CheckCheck whether the given lowercase word reads the same forward and backward and print 1 or 0.	Easy1	StringTwo pointers	No attempts yet	1s	256 MB	Judgeable
Use Every LetterDecide for each of up to 50 sentences whether it contains every letter a to z, and list the missing letters otherwise.	Easy1	StringArray	No attempts yet	2s	256 MB	Judgeable
Simon SaysPrint the trailing part of every command that starts with 'Simon says' and skip all other commands.	Easy1	StringImplementation	No attempts yet	2s	256 MB	Judgeable
Communication ChannelsCompare each transmitted binary string with its received copy and print OK when they match and ERROR otherwise.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Angry Grammar SticklerThe program counts banned words and phrases in each sentence and prints ten times that count.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Thai Lottery Prize CheckGiven the winning numbers and prize amounts for six Thai lottery categories, compute the total prize for each ticket by adding every matched category.	Easy1	StringImplementation	No attempts yet	2s	256 MB	Judgeable
Cryptographer's ConundrumCount the positions where the given string differs from PER repeated to the same length.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Count Me InCount the vowels and consonants in each of up to 100 given English sentences.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
!terces poTReverse every input line except the final END line and print each decoded sentence in order.	Easy1	String	No attempts yet	1s	256 MB	Judgeable
The Image Stretched Twice as WideCheck whether doubling every character of the first picture sideways produces the second picture.	Easy1	ImplementationString	No attempts yet	1s	512 MB	Judgeable
Concatenate two linesRead two input lines and print their concatenation with nothing inserted between them.	Easy1	String	No attempts yet	1s	256 MB	Judgeable
Lining Up by NameCheck whether the given player names stand in increasing or decreasing dictionary order and print INCREASING, DECREASING, or NEITHER.	Easy1	StringArray	No attempts yet	1s	256 MB	Judgeable
Affine CipherApply E(X) = (aX + b) mod 26 to each uppercase letter of the plaintext and print the ciphertext.	Easy1	ImplementationString+1	No attempts yet	5s	256 MB	Judgeable
ROT13Encrypt the given string with ROT13, shifting each English letter by 13 places and leaving other characters unchanged.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
Sum of digitsAdd N digits given as a single unspaced line and print their sum.	Easy1	ImplementationString	No attempts yet	1s	256 MB	Judgeable
Print ten characters per linePrint the given word in chunks of ten characters, one chunk per line.	Easy1	StringImplementation	No attempts yet	1s	256 MB	Judgeable
EssayPrint B distinct words formed by mapping the decimal digits of 0 to B-1 to letters a to j.	Easy1	ImplementationString	No attempts yet	1s	64 MB	Judgeable
NNRepeat the decimal form of N exactly N times and print at most its first M characters.	Easy1	ImplementationString	No attempts yet	1s	32 MB	Judgeable
Rulers of Centauri PrimeGiven T country names, report for each whether a king, a queen, or nobody rules it from its last letter.	Easy1	StringImplementation	No attempts yet	5s	512 MB	Judgeable
Rulers of Centauri PrimeGiven T country names, print for each whether its last letter marks a king, a queen, or nobody.	Easy1	StringImplementation	No attempts yet	5s	512 MB	Judgeable
KBO Korean Series Champion NumberGiven the Korean name of a KBO team that won the Korean Series, print the number assigned to that team.	Easy1	ImplementationString+1	No attempts yet	2s	512 MB	Judgeable
George BooleRead one boolean operation in the form true AND false and print its result.	Easy1	ImplementationString+2	No attempts yet	2s	512 MB	Judgeable
Java2016Given a target constant c, print 20 fixed macro definitions and then build one expression by appending a macro for each set bit of c.	Easy1	ImplementationSimulation+2	No attempts yet	2s	512 MB	Judgeable
HistogramRead n bar sizes and print one line of exactly k equals signs for each bar size k.	Easy1	ImplementationString	No attempts yet	2s	512 MB	Judgeable
Tournament SelectionCount wins among six game results and print the group number 1, 2, or 3, or -1 if there are no wins.	Easy1	ImplementationString	No attempts yet	2s	512 MB	Judgeable
HelicopterPrint the given ASCII art helicopter exactly as shown, with no trailing spaces on any line.	Easy1	ImplementationString	No attempts yet	1s	512 MB	Judgeable
A toast that wins over the roomGiven one of eight fixed Hangul abbreviations joined by periods, print the full Korean toast phrase it stands for.	Easy1	ImplementationString+1	No attempts yet	2s	512 MB	Judgeable
CAPSRead a lowercase string and print every character converted to uppercase.	Easy1	StringImplementation	No attempts yet	2s	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
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
Is it rated?Given the name of a past Codeforces contest, print 1 if the contest was rated and 0 otherwise.	Easy1	ImplementationString	No attempts yet	1s	512 MB	Judgeable
EmojiGiven a short message, determine for each line whether it contains the Slack cat emoji expressed as an ASCII shortcode.	Easy1	StringImplementation+1	No attempts yet	1s	512 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
Animal King ElectionRead nine votes, each either Tiger or Lion, and print the candidate who received more than half of them.	Easy1	ImplementationString	No attempts yet	1s	512 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
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
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
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
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
Yeongil's Ideal TypeGiven Yeongil's four-letter MBTI type, print the type in which each of the four letters is flipped to its opposite.	Easy1	StringImplementation+1	No attempts yet	1s	512 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
D2Given one line of text up to 10,000 characters, print D2 if it contains the adjacent pair D2 or d2, otherwise print unrated.	Easy1	StringString matching	No attempts yet	2.222s	222 MB	Judgeable