Tree of Life (medium)

constructive algorithms, hashing, trees

Palindromic Magic

data structures, hashing, strings

Two Sequences

data structures, hashing, string suffix structures

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

Frequency Mismatch (Hard Version)

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

Frequency Mismatch (Easy Version)

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

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

Shrink-Reverse

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

Pumping Lemma

hashing, strings

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Twilight and Ancient Scroll (harder version)

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

AmShZ Wins a Bet

data structures, greedy, hashing

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

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 Searching

*special problem, hashing

String Distance

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

Simplified Nonogram

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

Fractal Detector

dp, hashing

Button Pressing

bitmasks, constructive algorithms, hashing

Puzzle Lover

dp, hashing, strings

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

The Next Good String

data structures, greedy, hashing, strings

Concatenation with intersection

data structures, hashing, strings, two pointers

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

And Yet Another Bracket Sequence

data structures, greedy, hashing, string suffix structures, 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

Have You Ever Heard About the Word?

greedy, hashing, string suffix structures, strings

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

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

Liar

binary search, dp, hashing, string suffix structures

DZY Loves Strings

binary search, hashing, strings, two pointers

Labelling Cities

dfs and similar, graphs, hashing

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

Misha and LCP on Tree

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

Encoding

hashing, string suffix structures, strings

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Regular Forestation

hashing, trees

Death Stars (medium)

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

Two Arrays

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

Deletion of Repeats

greedy, hashing, string suffix structures

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

Palindrome Partition

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

Restoring the Expression

brute force, hashing, math

Zip-line

binary search, data structures, dp, hashing

Bear and Polynomials

hashing, implementation, math

Reachable Strings

data structures, hashing, strings

Light Bulbs (Hard Version)

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

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

Counter Attack

data structures, dsu, graphs, hashing, sortings

Three Occurrences

data structures, divide and conquer, hashing, two pointers

The Untended Antiquity

data structures, hashing

Kazaee

data structures, hashing, probabilities

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

Fibonacci Additions

brute force, data structures, hashing, implementation, math