Registration System

data structures, hashing, implementation

Winner

hashing, implementation

OR in Matrix

greedy, hashing, implementation

Vitaliy and Pie

greedy, hashing, strings

Password

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

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Equivalent Strings

divide and conquer, hashing, sortings, strings

Zero Quantity Maximization

hashing, math, number theory

Gargari and Bishops

greedy, hashing, implementation

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Prefix-Suffix Palindrome (Hard version)

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

Common Divisors

brute force, hashing, implementation, math, strings

Watto and Mechanism

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

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Kostya the Sculptor

data structures, hashing

Power Products

hashing, math, number theory

King's Path

dfs and similar, graphs, hashing, shortest paths

Treasure Island

dfs and similar, dp, flows, hashing

Camp Schedule

greedy, hashing, strings

Sasha and One More Name

constructive algorithms, hashing, strings

Compress Words

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

Queries for Number of Palindromes

dp, hashing, strings

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Palindromic characteristics

brute force, dp, hashing, strings

New Year and Conference

binary search, data structures, hashing, sortings

Felicity is Coming!

data structures, hashing, sortings, strings

New Year and Ancient Prophecy

dp, hashing, strings

Palindrome Degree

hashing, strings

Let's Play the Words?

data structures, hashing, implementation, math

Palindrome Pairs

hashing, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Ray Tracing

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

Spy Syndrome 2

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

Petr#

brute force, data structures, hashing, strings

Correcting Mistakes

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

String

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

Two strings

binary search, hashing, strings, two pointers

Sets

constructive algorithms, hashing, implementation

Messenger

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

Double Profiles

graphs, hashing, sortings

Spelling Check

hashing, implementation, strings

Om Nom and Necklace

hashing, string suffix structures, strings

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

LIS of Sequence

data structures, dp, greedy, hashing, math

Beaver

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

Test

hashing, strings

Make Them Similar

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

Check Transcription

brute force, data structures, hashing, strings

Kefa and Watch

data structures, hashing, strings

Bear and Polynomials

hashing, implementation, math

President and Roads

dfs and similar, graphs, hashing, shortest paths

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Instant Noodles

graphs, hashing, math, number theory

The Untended Antiquity

data structures, hashing

Sereja and Squares

binary search, data structures, hashing

Swapping Characters

brute force, hashing, implementation, strings

Isomorphic Strings

hashing, strings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Good Substrings

hashing, strings

Zip-line

binary search, data structures, dp, hashing

Acyclic Organic Compounds

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

Frequency of String

hashing, string suffix structures, strings

Restoring the Expression

brute force, hashing, math

Death Stars (medium)

hashing, strings

Marbles

hashing, strings

Deletion of Repeats

greedy, hashing, string suffix structures

Encoding

hashing, string suffix structures, strings

Peterson Polyglot

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

Reachable Strings

data structures, hashing, strings

String Compression

dp, hashing, string suffix structures, strings

Abbreviation

dp, hashing, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

The Supersonic Rocket

geometry, hashing, strings

Labelling Cities

dfs and similar, graphs, hashing

Morse Code

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

Ann and Books

data structures, flows, hashing

String Set Queries

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

Cutting Jigsaw Puzzle

hashing, implementation

The Number of Subpermutations

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

Complete Mirror

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

Regular Forestation

hashing, trees

Permutation

data structures, divide and conquer, hashing

Games on a CD

data structures, hashing, string suffix structures, strings

DZY Loves Strings

binary search, hashing, strings, two pointers

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Two Permutations

data structures, hashing, strings

Liar

binary search, dp, hashing, string suffix structures

Fractal Detector

dp, hashing

Superhero's Job

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

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Largest Submatrix 3

dp, hashing

Tricky and Clever Password

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

Indie Album

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

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Space Isaac

hashing, number theory

And Yet Another Bracket Sequence

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

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Have You Ever Heard About the Word?

greedy, hashing, string suffix structures, strings

Simplified Nonogram

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