Tree of Life (medium)

constructive algorithms, hashing, trees

Palindromic Magic

data structures, hashing, strings

Two Sequences

data structures, hashing, string suffix structures

Alphabetic Tree

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

Rap God

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

Optimizer

graphs, greedy, hashing, implementation

Speckled Band

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

AmShZ Wins a Bet

data structures, greedy, hashing

Palindromic Hamiltonian Path

brute force, dfs and similar, dp, graphs, hashing

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

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Mars

hashing

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Nastya and CBS

brute force, data structures, hashing

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Berland SU Computer Network

constructive algorithms, dfs and similar, graphs, hashing, trees

String Distance

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

Minimum Difference

data structures, hashing, sortings, two pointers

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

Andrew and Chemistry

dp, hashing, trees

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

The Next Good String

data structures, greedy, hashing, strings

Puzzle Lover

dp, hashing, strings

Quadratic Set

constructive algorithms, hashing, math, number theory

String Searching

*special problem, hashing

Simplified Nonogram

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

Concatenation with intersection

data structures, hashing, strings, two pointers

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

String Transformation

hashing, strings

Similar Words

dp, hashing, strings, trees

Space Isaac

hashing, number theory

Fractal Detector

dp, hashing

Have You Ever Heard About the Word?

greedy, hashing, string suffix structures, strings

And Yet Another Bracket Sequence

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

Superhero's Job

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

Largest Submatrix 3

dp, hashing

k-substrings

binary search, hashing, string suffix structures

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Tricky and Clever Password

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

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

Misha and LCP on Tree

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

Minimal String Xoration

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

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Indie Album

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

Playoff Restoration

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

Cutting Jigsaw Puzzle

hashing, implementation

Regular Forestation

hashing, trees

Complete Mirror

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

The Supersonic Rocket

geometry, hashing, strings

Labelling Cities

dfs and similar, graphs, hashing

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Song of the Sirens

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

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

Marbles

hashing, strings

Peterson Polyglot

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

Morse Code

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

Death Stars (medium)

hashing, strings

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Permutation

data structures, divide and conquer, hashing

Encoding

hashing, string suffix structures, strings

Games on a CD

data structures, hashing, string suffix structures, strings

Good Substrings

hashing, strings

Deletion of Repeats

greedy, hashing, string suffix structures

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Abbreviation

dp, hashing, strings

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Restoring the Expression

brute force, hashing, math

String Compression

dp, hashing, string suffix structures, strings

Acyclic Organic Compounds

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

Reachable Strings

data structures, hashing, strings

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Zip-line

binary search, data structures, dp, hashing

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

Swapping Characters

brute force, hashing, implementation, strings

The Untended Antiquity

data structures, hashing

Counter Attack

data structures, dsu, graphs, hashing, sortings

Bear and Polynomials

hashing, implementation, math

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Sereja and Squares

binary search, data structures, hashing

Frequency of String

hashing, string suffix structures, strings

President and Roads

dfs and similar, graphs, hashing, shortest paths

Isomorphic Strings

hashing, strings

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Check Transcription

brute force, data structures, hashing, strings

Kefa and Watch

data structures, hashing, strings

Beaver

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

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Test

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

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Instant Noodles

graphs, hashing, math, number theory