Tree of Life (medium)

constructive algorithms, hashing, trees

Palindromic Magic

data structures, hashing, strings

Two Sequences

data structures, hashing, string suffix structures

Card Pairing

dp, greedy, hashing, implementation

Optimizer

graphs, greedy, hashing, implementation

Rap God

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

Alphabetic Tree

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

Speckled Band

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

Palindromic Hamiltonian Path

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

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Palindromic Problem

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

Mars

hashing

Berland SU Computer Network

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

Pumping Lemma

hashing, strings

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Shrink-Reverse

binary search, brute force, greedy, hashing, implementation, string suffix structures, strings

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

Twilight and Ancient Scroll (harder version)

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

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

AmShZ Wins a Bet

data structures, greedy, hashing

Andrew and Chemistry

dp, hashing, trees

Most Different Tree

brute force, constructive algorithms, dfs and similar, greedy, hashing

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

String Distance

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

String Searching

*special problem, hashing

Simplified Nonogram

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

Fractal Detector

dp, hashing

Puzzle Lover

dp, hashing, strings

Button Pressing

bitmasks, constructive algorithms, hashing

Nastya and CBS

brute force, data structures, hashing

String Transformation

hashing, strings

Similar Words

dp, hashing, strings, trees

Space Isaac

hashing, number theory

Superhero's Job

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

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Concatenation with intersection

data structures, hashing, strings, two pointers

And Yet Another Bracket Sequence

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

The Next Good String

data structures, greedy, hashing, strings

Minimum Difference

data structures, hashing, sortings, two pointers

Largest Submatrix 3

dp, hashing

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Quadratic Set

constructive algorithms, hashing, math, number theory

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Have You Ever Heard About the Word?

greedy, hashing, string suffix structures, strings

k-substrings

binary search, hashing, string suffix structures

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Tricky and Clever Password

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

Vicky's Delivery Service

data structures, dsu, graphs, hashing

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Cutting Jigsaw Puzzle

hashing, implementation

DZY Loves Strings

binary search, hashing, strings, two pointers

Labelling Cities

dfs and similar, graphs, hashing

Liar

binary search, dp, hashing, string suffix structures

Two Permutations

data structures, hashing, strings

Marbles

hashing, strings

Playoff Restoration

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

Complete Mirror

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

The Supersonic Rocket

geometry, hashing, strings

Song of the Sirens

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

Peterson Polyglot

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

Encoding

hashing, string suffix structures, strings

Regular Forestation

hashing, trees

Misha and LCP on Tree

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

Death Stars (medium)

hashing, strings

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Morse Code

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

Good Substrings

hashing, strings

Indie Album

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

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Common Divisor Graph

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

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Gojou and Matrix Game

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

Deletion of Repeats

greedy, hashing, string suffix structures

Two Arrays

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

Minimal String Xoration

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

Acyclic Organic Compounds

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

Abbreviation

dp, hashing, strings

Games on a CD

data structures, hashing, string suffix structures, strings

Restoring the Expression

brute force, hashing, math

Palindrome Partition

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

Bear and Polynomials

hashing, implementation, math

Zip-line

binary search, data structures, dp, hashing

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Reachable Strings

data structures, hashing, strings

Swapping Characters

brute force, hashing, implementation, strings

Tree-String Problem

*special problem, dfs and similar, hashing, strings

String Compression

dp, hashing, string suffix structures, strings

Permutation

data structures, divide and conquer, hashing

Sereja and Squares

binary search, data structures, hashing

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Three Occurrences

data structures, divide and conquer, hashing, two pointers

The Untended Antiquity

data structures, hashing

Fibonacci Additions

brute force, data structures, hashing, implementation, math