A Tide of Riverscape

constructive algorithms, strings

A Blend of Springtime

implementation, strings

Substrings Sort

sortings, strings

Isomorphic Strings

hashing, strings

Antipalindrome

brute force, implementation, strings

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

File Name

greedy, strings

Two-gram

implementation, strings

Aramic script

implementation, strings

Short Code

data structures, dp, greedy, strings, trees

Frequency of String

hashing, string suffix structures, strings

Death Stars (medium)

hashing, strings

Scissors

brute force, strings

String Typing

implementation, strings

String Transformation

greedy, strings

Phone Numbers

constructive algorithms, implementation, strings

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

Lock Puzzle

constructive algorithms, implementation, strings

Palindrome Partition

dp, string suffix structures, strings

Game with String

implementation, probabilities, strings

Autocompletion

*special problem, strings, trees

Login Verification

*special problem, strings

Picking Strings

constructive algorithms, implementation, strings

Perfect Security

data structures, greedy, strings, trees

Radio Station

implementation, strings

Upside Down

data structures, string suffix structures, strings, trees

Substrings in a String

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

Reverses

dp, string suffix structures, strings

Shockers

implementation, strings

Swapping Characters

brute force, hashing, implementation, strings

Maximum Questions

data structures, dp, strings

Letters Removing

data structures, strings

Phone Numbers

implementation, strings

String Mark

combinatorics, math, strings

Palindromic Cut

brute force, implementation, strings

Field of Wonders

implementation, strings

Alex and broken contest

implementation, strings

Forbidden Indices

dsu, string suffix structures, strings

Huge Strings

bitmasks, brute force, dp, implementation, strings

Bark to Unlock

brute force, implementation, strings

Polycarp and Letters

brute force, implementation, strings

Mahmoud and Ehab and the final stage

data structures, strings

Similar Words

dp, hashing, strings, trees

Tom Riddle's Diary

brute force, implementation, strings

Diversity

greedy, implementation, strings

Palindromic characteristics

brute force, dp, hashing, strings

Petya and Exam

implementation, strings

Keyboard Layouts

implementation, strings

Rusty String

fft, math, strings

DNA Evolution

data structures, strings

String Reconstruction

data structures, greedy, sortings, strings

String Compression

dp, hashing, string suffix structures, strings

Crossword solving

brute force, implementation, strings

An impassioned circulation of affection

brute force, dp, strings, two pointers

Anthem of Berland

dp, strings

Fake News (medium)

constructive algorithms, strings

Fake News (easy)

implementation, strings

Valued Keys

constructive algorithms, greedy, strings

Mike and strings

brute force, dp, strings

Mike and palindrome

brute force, constructive algorithms, strings

Minimal string

data structures, greedy, strings

Rap God

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

Anton and Polyhedrons

implementation, strings

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Peterson Polyglot

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

String Game

binary search, greedy, strings

Cloud of Hashtags

binary search, greedy, implementation, strings

A Serial Killer

brute force, implementation, strings

Stepan and Vowels

*special problem, implementation, strings

Mahmoud and a Message

brute force, dp, greedy, strings

Mahmoud and Longest Uncommon Subsequence

constructive algorithms, strings

Code obfuscation

greedy, implementation, strings

Two strings

binary search, hashing, strings, two pointers

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Felicity is Coming!

data structures, hashing, sortings, strings

PolandBall and Game

binary search, data structures, games, greedy, sortings, strings

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Vladik and chat

brute force, constructive algorithms, dp, implementation, strings

Santa Claus and Keyboard Check

implementation, strings

Comments

dfs and similar, expression parsing, implementation, strings

Mammoth's Genome Decoding

implementation, strings

Decoding

implementation, strings

Hongcow Learns the Cyclic Shift

implementation, strings

Hongcow Masters the Cyclic Shift

strings, two pointers

Ostap and Grasshopper

implementation, strings

Anton and Danik

implementation, strings

Night at the Museum

implementation, strings

Interview with Oleg

implementation, strings

Games on a CD

data structures, hashing, string suffix structures, strings

Bill Total Value

expression parsing, implementation, strings

Hidden Word

brute force, constructive algorithms, implementation, strings

Dense Subsequence

data structures, greedy, strings

Text Document Analysis

expression parsing, implementation, strings

Generating Sets

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

Verse Pattern

implementation, strings

Passwords

implementation, math, sortings, strings

Memory and Trident

implementation, strings

String Set Queries

brute force, data structures, hashing, interactive, string suffix structures, strings

Letters Cyclic Shift

constructive algorithms, greedy, implementation, strings

Hard problem

dp, strings