Palindromic Magic

data structures, hashing, strings

Boboniu and Banknote Collection

strings

Alphabetic Tree

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

Ж-function

string suffix structures, strings

Speckled Band

data structures, divide and conquer, hashing, string suffix structures, strings

Modest Substrings

dp, strings

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Upside Down

data structures, string suffix structures, strings, trees

Rap God

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

Reverses

dp, string suffix structures, strings

Cool Slogans

string suffix structures, strings

Hongcow Masters the Cyclic Shift

strings, two pointers

Detect Robots

data structures, strings

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Fedya the Potter Strikes Back

data structures, strings

Puzzle Lover

dp, hashing, strings

Digits of Number Pi

dp, implementation, strings

Birthday

graph matchings, strings

String Theory

geometry, math, strings

Cutting the Line

string suffix structures, strings

Expected Value Again

combinatorics, strings

Find String in a Grid

data structures, dp, strings, trees

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Appleman and a Game

binary search, shortest paths, strings

String Distance

binary search, brute force, data structures, hashing, implementation, strings

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Duff is Mad

data structures, strings

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Cyclic Shifts

*special problem, strings

Mahmoud and Ehab and the final stage

data structures, strings

Wrap Around

dp, strings

Tree and XOR

strings, trees

Palindrome Partition

dp, string suffix structures, strings

Palisection

strings

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

AB-Strings

constructive algorithms, strings

Au Pont Rouge

binary search, dp, strings

Speed Dial

dp, strings, trees

The Next Good String

data structures, greedy, hashing, strings

Have You Ever Heard About the Word?

greedy, hashing, string suffix structures, strings

Tricky and Clever Password

binary search, constructive algorithms, data structures, greedy, hashing, strings

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

Xors on Segments

data structures, strings, trees

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

e-Government

data structures, dfs and similar, dp, strings, trees

Mike and Friends

data structures, string suffix structures, strings, trees

Fibonacci Suffix

strings

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Concatenation with intersection

data structures, hashing, strings, two pointers

Construct the String

data structures, dp, strings

Dreamoon and Binary

dp, strings

Expensive Strings

string suffix structures, strings

And Yet Another Bracket Sequence

data structures, greedy, hashing, string suffix structures, strings

Two Permutations

data structures, hashing, strings

Minlexes

dp, greedy, implementation, strings

Indie Album

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

Rusty String

fft, math, strings

Cyclical Quest

data structures, string suffix structures, strings

Fibonacci Strings

matrices, strings

Moonwalk challenge

data structures, strings, trees

Two Prefixes

strings

Scissors

brute force, strings

Mission Impassable

dp, strings

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Strange LCS

bitmasks, dp, graphs, greedy, strings

Death DBMS

data structures, string suffix structures, strings, trees

Enormous XOR

bitmasks, constructive algorithms, greedy, math, strings, two pointers

Song of the Sirens

combinatorics, divide and conquer, hashing, math, string suffix structures, strings

Paper task

data structures, string suffix structures, strings

Koala and Notebook

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

Awesome Substrings

math, strings

Rotating Substrings

dp, strings

Wilbur and Strings

dfs and similar, dp, graphs, strings

String Transformation

hashing, strings

DZY Loves Strings

binary search, hashing, strings, two pointers

Alphabet Permutations

data structures, strings

Codeword

combinatorics, strings

Marbles

hashing, strings

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

Middle Duplication

data structures, dfs and similar, greedy, strings, trees

Legen...

data structures, dp, matrices, strings

Reachable Strings

data structures, hashing, strings

Rescue Niwen!

dp, greedy, string suffix structures, strings

Picking Strings

constructive algorithms, implementation, strings

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

Frequency of String

hashing, string suffix structures, strings

Kefa and Watch

data structures, hashing, strings

Fibonacci Strings

strings

Refactoring

greedy, implementation, strings

The Supersonic Rocket

geometry, hashing, strings

Sonya and Matrix Beauty

strings

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Morse Code

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

Encoding

hashing, string suffix structures, strings

Three strings

data structures, dsu, string suffix structures, strings

String Compression

dp, hashing, string suffix structures, strings

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

Forbidden Indices

dsu, string suffix structures, strings