Registration System

data structures, hashing, implementation

Winner

hashing, implementation

OR in Matrix

greedy, hashing, implementation

Password

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

Vitaliy and Pie

greedy, hashing, strings

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Spy-string

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

Equivalent Strings

divide and conquer, hashing, sortings, strings

Zero Quantity Maximization

hashing, math, number theory

Prefix-Suffix Palindrome (Hard version)

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

Gargari and Bishops

greedy, hashing, implementation

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Common Divisors

brute force, hashing, implementation, math, strings

King's Path

dfs and similar, graphs, hashing, shortest paths

Watto and Mechanism

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

Power Products

hashing, math, number theory

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Kostya the Sculptor

data structures, hashing

Camp Schedule

greedy, hashing, strings

Compress Words

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

Sasha and One More Name

constructive algorithms, hashing, 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

Let's Play the Words?

data structures, hashing, implementation, math

New Year and Conference

binary search, data structures, hashing, sortings

Palindrome Degree

hashing, strings

Palindrome Pairs

hashing, strings

New Year and Ancient Prophecy

dp, hashing, strings

Felicity is Coming!

data structures, hashing, sortings, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Spy Syndrome 2

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

Petr#

brute force, data structures, hashing, strings

Ray Tracing

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

Two strings

binary search, hashing, strings, two pointers

String

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

Correcting Mistakes

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

Messenger

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

Spelling Check

hashing, implementation, strings

Sets

constructive algorithms, hashing, implementation

Double Profiles

graphs, hashing, sortings

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Om Nom and Necklace

hashing, string suffix structures, strings

LIS of Sequence

data structures, dp, greedy, hashing, math

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Beaver

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

Make Them Similar

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

Test

hashing, strings

Instant Noodles

graphs, hashing, math, number theory

Check Transcription

brute force, data structures, hashing, strings

Kefa and Watch

data structures, hashing, strings

President and Roads

dfs and similar, graphs, hashing, shortest paths

Bear and Polynomials

hashing, implementation, math

Tree-String Problem

*special problem, dfs and similar, hashing, strings

The Untended Antiquity

data structures, hashing

Sereja and Squares

binary search, data structures, hashing

Isomorphic Strings

hashing, strings

Swapping Characters

brute force, hashing, implementation, strings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Zip-line

binary search, data structures, dp, hashing

Frequency of String

hashing, string suffix structures, strings

Good Substrings

hashing, strings

Acyclic Organic Compounds

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

Reachable Strings

data structures, hashing, strings

Restoring the Expression

brute force, hashing, math

Deletion of Repeats

greedy, hashing, string suffix structures

String Compression

dp, hashing, string suffix structures, strings

Abbreviation

dp, hashing, strings

Death Stars (medium)

hashing, strings

Marbles

hashing, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Encoding

hashing, string suffix structures, strings

String Set Queries

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

Peterson Polyglot

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

Three Occurrences

data structures, divide and conquer, hashing, two pointers

The Number of Subpermutations

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

Ann and Books

data structures, flows, hashing

Morse Code

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

Labelling Cities

dfs and similar, graphs, hashing

Games on a CD

data structures, hashing, string suffix structures, strings

The Supersonic Rocket

geometry, hashing, strings

Cutting Jigsaw Puzzle

hashing, implementation

Complete Mirror

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

Regular Forestation

hashing, trees

Permutation

data structures, divide and conquer, hashing

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

DZY Loves Strings

binary search, hashing, strings, two pointers

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Two Permutations

data structures, hashing, strings

Indie Album

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

Liar

binary search, dp, hashing, 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

Superhero's Job

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

Fractal Detector

dp, hashing

Largest Submatrix 3

dp, hashing

Misha and LCP on Tree

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

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Space Isaac

hashing, number theory