Elementary!

brute force, dp, strings

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Prefix-Suffix Palindrome (Hard version)

binary search, greedy, hashing, string suffix structures, strings

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Yet Another Palindrome Problem

brute force, strings

String Modification

brute force, constructive algorithms, implementation, sortings, strings

Kuroni and Simple Strings

constructive algorithms, greedy, strings, two pointers

Remove Adjacent

brute force, constructive algorithms, greedy, strings

Reachable Strings

data structures, hashing, strings

Paint the String

*special problem, dp, strings

Homecoming

binary search, dp, greedy, strings

Au Pont Rouge

binary search, dp, strings

Concatenation with intersection

data structures, hashing, strings, two pointers

Cow and Message

brute force, dp, math, strings

Longest Palindrome

brute force, constructive algorithms, greedy, implementation, strings

Ayoub's function

binary search, combinatorics, greedy, math, strings

Three Strings

implementation, strings

Erase Subsequences

dp, strings

Erasing Zeroes

implementation, strings

Even But Not Even

greedy, math, strings

Irreducible Anagrams

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

Obtain The String

dp, greedy, strings

Infinite Prefixes

math, strings

Dr. Evil Underscores

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

Fedya the Potter Strikes Back

data structures, strings

New Year and Naming

implementation, strings

Awesome Substrings

math, strings

Enchanted Artifact

constructive algorithms, interactive, strings

Long Beautiful Integer

constructive algorithms, greedy, implementation, strings

Shuffle Hashing

brute force, implementation, strings

Two Bracket Sequences

dp, strings, two pointers

Lexicography

constructive algorithms, strings

Dominated Subarray

greedy, implementation, sortings, strings, two pointers

Character Swap (Hard Version)

strings

Character Swap (Easy Version)

strings

Equalizing Two Strings

constructive algorithms, sortings, strings

Binary Palindromes

greedy, strings

Broken Keyboard

brute force, strings, two pointers

Find String in a Grid

data structures, dp, strings, trees

AB-string

binary search, combinatorics, dp, strings

Strings Equalization

strings

Middle-Out

constructive algorithms, greedy, strings

Prefixes

strings

Substring Game in the Lesson

games, greedy, strings

Cards

implementation, sortings, strings

Periodic integer number

implementation, strings

Koala and Notebook

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

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Unstable String Sort

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

Indie Album

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

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Kirk and a Binary String (easy version)

brute force, greedy, strings

Expected Value Again

combinatorics, strings

Compress Words

brute force, hashing, implementation, string suffix structures, 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

Archaeology

brute force, constructive algorithms, greedy, strings

WOW Factor

dp, strings

From S To T

implementation, strings

Keanu Reeves

strings

Letters Shop

binary search, implementation, strings

Subsequences (hard version)

dp, strings

Email from Polycarp

implementation, strings

Split a Number

greedy, implementation, strings

Beautiful Lyrics

data structures, greedy, strings

Plus from Picture

dfs and similar, implementation, strings

Minus and Minus Give Plus

*special problem, implementation, strings

Telephone Number

brute force, greedy, strings

The minimal unique substring

constructive algorithms, math, strings

Mysterious Code

dp, strings

Chladni Figure

brute force, strings

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Three Religions

dp, implementation, strings

Reverse a Substring

implementation, sortings, strings

Hate "A"

implementation, strings

Love "A"

implementation, strings

Maxim and Biology

brute force, strings

Serval and Parenthesis Sequence

greedy, 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

Compress String

dp, strings

Morse Code

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

String Multiplication

dp, greedy, strings

Sasha and One More Name

constructive algorithms, hashing, strings

Modest Substrings

dp, strings

Superhero Transformation

implementation, 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

Vasya and Templates

greedy, implementation, strings

Right-Left Cipher

implementation, strings