Tree of Life (medium)

constructive algorithms, hashing, trees

Palindromic Magic

data structures, hashing, strings

Optimizer

graphs, greedy, hashing, implementation

Rap God

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

Speckled Band

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

Twilight and Ancient Scroll (harder version)

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

Nastya and CBS

brute force, data structures, hashing

String Distance

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

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Minimum Difference

data structures, hashing, sortings, two pointers

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Berland SU Computer Network

dfs and similar, hashing, trees

Andrew and Chemistry

dp, hashing, trees

Puzzle Lover

dp, hashing, strings

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Concatenation with intersection

data structures, hashing, strings, two pointers

The Next Good String

data structures, greedy, hashing, strings

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

k-substrings

binary search, hashing, string suffix structures

String Transformation

hashing, strings

Simplified Nonogram

bitmasks, dp, hashing, meet-in-the-middle

And Yet Another Bracket Sequence

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

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Space Isaac

hashing, number theory

Similar Words

dp, hashing, strings, trees

Have You Ever Heard About the Word?

greedy, hashing, string suffix structures, strings

Largest Submatrix 3

dp, hashing

Fractal Detector

dp, hashing

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Superhero's Job

dfs and similar, dp, hashing, math, number theory

Tricky and Clever Password

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

Misha and LCP on Tree

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

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Two Permutations

data structures, hashing, strings

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Liar

binary search, dp, hashing, string suffix structures

DZY Loves Strings

binary search, hashing, strings, two pointers

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Indie Album

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

Cutting Jigsaw Puzzle

hashing, implementation

Regular Forestation

hashing, trees

Permutation

data structures, divide and conquer, hashing

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Song of the Sirens

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

The Supersonic Rocket

geometry, hashing, strings

Labelling Cities

dfs and similar, graphs, hashing

Morse Code

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

Games on a CD

data structures, hashing, string suffix structures, strings

Marbles

hashing, strings

Death Stars (medium)

hashing, strings

Peterson Polyglot

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

Encoding

hashing, string suffix structures, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Abbreviation

dp, hashing, strings

Deletion of Repeats

greedy, hashing, string suffix structures

Ann and Books

data structures, flows, hashing

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

String Set Queries

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

String Compression

dp, hashing, string suffix structures, strings

Good Substrings

hashing, strings

Acyclic Organic Compounds

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

Restoring the Expression

brute force, hashing, math

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Reachable Strings

data structures, hashing, strings

Zip-line

binary search, data structures, dp, hashing

Counter Attack

data structures, dsu, graphs, hashing, sortings

Frequency of String

hashing, string suffix structures, strings

Swapping Characters

brute force, hashing, implementation, strings

The Untended Antiquity

data structures, hashing

Sereja and Squares

binary search, data structures, hashing

Isomorphic Strings

hashing, strings

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Bear and Polynomials

hashing, implementation, math

A-Z Graph

constructive algorithms, data structures, graphs, hashing

President and Roads

dfs and similar, graphs, hashing, shortest paths

Kefa and Watch

data structures, hashing, strings

Check Transcription

brute force, data structures, hashing, strings

Test

hashing, strings

Instant Noodles

graphs, hashing, math, number theory

Beaver

data structures, dp, greedy, hashing, strings, two pointers

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Make Them Similar

bitmasks, brute force, hashing, meet-in-the-middle

A Bit Similar

bitmasks, brute force, hashing, string suffix structures, strings, two pointers

Om Nom and Necklace

hashing, string suffix structures, strings

LIS of Sequence

data structures, dp, greedy, hashing, math

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Sets

constructive algorithms, hashing, implementation

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Messenger

data structures, hashing, implementation, string suffix structures, strings

Double Profiles

graphs, hashing, sortings

Ray Tracing

greedy, hashing, implementation, math, number theory, sortings

Correcting Mistakes

constructive algorithms, dp, greedy, hashing, strings, two pointers

String

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

Two strings

binary search, hashing, strings, two pointers

Spelling Check

hashing, implementation, strings

Petr#

brute force, data structures, hashing, strings

Spy Syndrome 2

data structures, dp, hashing, implementation, sortings, string suffix structures, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math