Reachable Strings

data structures, hashing, strings

String Modification

brute force, constructive algorithms, implementation, sortings, strings

Homecoming

binary search, dp, greedy, strings

Concatenation with intersection

data structures, hashing, strings, two pointers

Au Pont Rouge

binary search, dp, strings

Cow and Message

brute force, dp, math, strings

Kuroni and Simple Strings

constructive algorithms, greedy, strings, two pointers

Longest Palindrome

brute force, constructive algorithms, greedy, implementation, strings

Erase Subsequences

dp, strings

Erasing Zeroes

implementation, strings

Ayoub's function

binary search, combinatorics, greedy, math, strings

Three Strings

implementation, strings

Paint the String

*special problem, dp, strings

Obtain The String

dp, greedy, strings

Infinite Prefixes

math, strings

Even But Not Even

greedy, math, strings

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

Fedya the Potter Strikes Back

data structures, strings

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

New Year and Naming

implementation, strings

Enchanted Artifact

constructive algorithms, interactive, strings

Shuffle Hashing

brute force, implementation, strings

Two Bracket Sequences

dp, strings, two pointers

Awesome Substrings

math, strings

Long Beautiful Integer

constructive algorithms, greedy, implementation, strings

Lexicography

constructive algorithms, strings

Dominated Subarray

greedy, implementation, sortings, strings, two pointers

Equalizing Two Strings

constructive algorithms, sortings, strings

Find String in a Grid

data structures, dp, strings, trees

Binary Palindromes

greedy, strings

Broken Keyboard

brute force, strings, two pointers

Character Swap (Hard Version)

strings

Character Swap (Easy Version)

strings

AB-string

binary search, combinatorics, dp, strings

Middle-Out

constructive algorithms, greedy, strings

Strings Equalization

strings

Substring Game in the Lesson

games, greedy, strings

Cards

implementation, sortings, strings

Periodic integer number

implementation, strings

Prefixes

strings

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Expected Value Again

combinatorics, strings

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Kirk and a Binary String (easy version)

brute force, greedy, strings

You Are Given Some Strings...

brute force, string suffix structures, strings

Print a 1337-string...

combinatorics, constructive algorithms, math, strings

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Important Exam

implementation, strings

Compress Words

brute force, hashing, implementation, string suffix structures, strings

From S To T

implementation, strings

Keanu Reeves

strings

Letters Shop

binary search, implementation, strings

Email from Polycarp

implementation, strings

Subsequences (hard version)

dp, strings

Beautiful Lyrics

data structures, greedy, strings

Plus from Picture

dfs and similar, implementation, strings

Split a Number

greedy, implementation, strings

Archaeology

brute force, constructive algorithms, greedy, strings

WOW Factor

dp, strings

Minus and Minus Give Plus

*special problem, implementation, strings

Telephone Number

brute force, greedy, strings

Mysterious Code

dp, strings

The minimal unique substring

constructive algorithms, math, strings

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Reverse a Substring

implementation, sortings, strings

Serval and Parenthesis Sequence

greedy, strings

Maxim and Biology

brute force, strings

Three Religions

dp, implementation, strings

Chladni Figure

brute force, strings

Hate "A"

implementation, strings

Love "A"

implementation, strings

Median String

bitmasks, math, number theory, strings

Diverse Strings

implementation, strings

Good String

implementation, strings

Even Substrings

implementation, strings

Circus

brute force, greedy, math, strings

Camp Schedule

greedy, hashing, strings

String Multiplication

dp, greedy, strings

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Compress String

dp, strings

Superhero Transformation

implementation, strings

Modest Substrings

dp, strings

Sasha and One More Name

constructive algorithms, hashing, strings

Digits Sequence Dividing

greedy, strings

Zuhair and Strings

brute force, implementation, strings

Balanced Ternary String

greedy, strings

Ж-function

string suffix structures, strings

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Substring Removal

combinatorics, math, strings

Letters Rearranging

constructive algorithms, greedy, sortings, strings

Prefixes and Suffixes

strings

Two Prefixes

strings

Vasya and Templates

greedy, implementation, strings

Right-Left Cipher

implementation, strings

The Fair Nut and Strings

greedy, strings

Speed Dial

dp, strings, trees

Palindromic Magic

data structures, hashing, strings