Tree of Life (medium)

constructive algorithms, hashing, trees

Fortnite

combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings

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

Card Pairing

dp, greedy, hashing, implementation

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

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Shrink-Reverse

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

Twilight and Ancient Scroll (harder version)

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

Frequency Mismatch (Hard Version)

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

Pumping Lemma

hashing, strings

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Andrew and Chemistry

dp, hashing, trees

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Most Different Tree

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

Frequency Mismatch (Easy Version)

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

Penacony

brute force, data structures, dp, hashing

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

AmShZ Wins a Bet

data structures, greedy, 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

Fractal Detector

dp, hashing

Puzzle Lover

dp, hashing, strings

Simplified Nonogram

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

String Transformation

hashing, strings

Button Pressing

bitmasks, constructive algorithms, hashing

Similar Words

dp, hashing, strings, trees

Nastya and CBS

brute force, data structures, hashing

Superhero's Job

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

Space Isaac

hashing, number theory

And Yet Another Bracket Sequence

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

The Next Good String

data structures, greedy, hashing, strings

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Concatenation with intersection

data structures, hashing, strings, two pointers

Largest Submatrix 3

dp, hashing

Minimum Difference

data structures, hashing, sortings, two pointers

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

Delicious Dessert

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

Vicky's Delivery Service

data structures, dsu, graphs, hashing

k-substrings

binary search, hashing, string suffix structures

Tricky and Clever Password

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

BinCoin

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

Cutting Jigsaw Puzzle

hashing, implementation

DZY Loves Strings

binary search, hashing, strings, two pointers

Two Permutations

data structures, hashing, strings

Marbles

hashing, strings

Playoff Restoration

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

Liar

binary search, dp, hashing, string suffix structures

Labelling Cities

dfs and similar, graphs, hashing

Complete Mirror

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

Permutation Problem (Hard Version)

brute force, data structures, hashing, math, number theory

Peterson Polyglot

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

Encoding

hashing, string suffix structures, strings

Death Stars (medium)

hashing, strings

Misha and LCP on Tree

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

Song of the Sirens

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

Regular Forestation

hashing, trees

Morse Code

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

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Good Substrings

hashing, strings

Indie Album

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

Common Divisor Graph

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

The Supersonic Rocket

geometry, hashing, strings

Gojou and Matrix Game

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

Hossam and Range Minimum Query

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

Labeling the Tree with Distances

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

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

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

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

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Abbreviation

dp, hashing, strings

String Compression

dp, hashing, string suffix structures, strings

Permutation

data structures, divide and conquer, hashing

Reachable Strings

data structures, hashing, strings

Sereja and Squares

binary search, data structures, hashing

Swapping Characters

brute force, hashing, implementation, strings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Three Occurrences

data structures, divide and conquer, hashing, two pointers