Vitaliy and Pie

greedy, hashing, strings

Registration System

data structures, hashing, implementation

OR in Matrix

greedy, hashing, implementation

Common Divisors

brute force, hashing, implementation, math, strings

Winner

hashing, implementation

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Zero Quantity Maximization

hashing, math, number theory

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Spelling Check

hashing, implementation, strings

Kostya the Sculptor

data structures, hashing

Camp Schedule

greedy, hashing, strings

Palindrome Pairs

hashing, strings

Password

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

Spy-string

bitmasks, brute force, constructive algorithms, dp, hashing, strings

Equivalent Strings

divide and conquer, hashing, sortings, strings

Sets

constructive algorithms, hashing, implementation

Good Substrings

hashing, strings

Prefix-Suffix Palindrome (Hard version)

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

King's Path

dfs and similar, graphs, hashing, shortest paths

Power Products

hashing, math, number theory

Sasha and One More Name

constructive algorithms, hashing, strings

Queries for Number of Palindromes

dp, hashing, strings

Ray Tracing

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

Correcting Mistakes

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

Beaver

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

Cutting Jigsaw Puzzle

hashing, implementation

Gargari and Bishops

greedy, hashing, implementation

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Palindromic characteristics

brute force, dp, hashing, strings

Let's Play the Words?

data structures, hashing, implementation, math

Felicity is Coming!

data structures, hashing, sortings, strings

Spy Syndrome 2

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

Watto and Mechanism

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

Compress Words

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

New Year and Ancient Prophecy

dp, hashing, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Petr#

brute force, data structures, hashing, strings

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Death Stars (medium)

hashing, strings

Fractal Detector

dp, hashing

New Year and Conference

binary search, data structures, hashing, sortings

Two strings

binary search, hashing, strings, two pointers

String

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

Messenger

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

Check Transcription

brute force, data structures, hashing, strings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Palindrome Degree

hashing, strings

Om Nom and Necklace

hashing, string suffix structures, strings

LIS of Sequence

data structures, dp, greedy, hashing, math

Test

hashing, strings

President and Roads

dfs and similar, graphs, hashing, shortest paths

Bear and Polynomials

hashing, implementation, math

Swapping Characters

brute force, hashing, implementation, strings

Deletion of Repeats

greedy, hashing, string suffix structures

Abbreviation

dp, hashing, strings

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Double Profiles

graphs, hashing, sortings

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Instant Noodles

graphs, hashing, math, number theory

Sereja and Squares

binary search, data structures, hashing

Isomorphic Strings

hashing, strings

Restoring the Expression

brute force, hashing, math

Ann and Books

data structures, flows, hashing

Games on a CD

data structures, hashing, string suffix structures, strings

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Make Them Similar

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

The Untended Antiquity

data structures, hashing

Acyclic Organic Compounds

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

String Compression

dp, hashing, string suffix structures, strings

Encoding

hashing, string suffix structures, strings

String Set Queries

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

Labelling Cities

dfs and similar, graphs, hashing

Morse Code

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

The Supersonic Rocket

geometry, hashing, strings

Complete Mirror

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

Regular Forestation

hashing, trees

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Liar

binary search, dp, hashing, string suffix structures

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Space Isaac

hashing, number theory

Simplified Nonogram

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

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Berland SU Computer Network

dfs and similar, hashing, trees

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Kefa and Watch

data structures, hashing, strings

Frequency of String

hashing, string suffix structures, strings

Reachable Strings

data structures, hashing, strings

Marbles

hashing, strings

The Number of Subpermutations

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

Peterson Polyglot

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

Three Occurrences

data structures, divide and conquer, hashing, two pointers

DZY Loves Strings

binary search, hashing, strings, two pointers

String Transformation

hashing, strings

Zip-line

binary search, data structures, dp, hashing

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Superhero's Job

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