Registration System

data structures, hashing, implementation

Same Differences

data structures, hashing, math

Winner

hashing, implementation

OR in Matrix

greedy, hashing, implementation

String Equality

dp, greedy, hashing, implementation, strings

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

Sequence Pair Weight

hashing, implementation, math

Diluc and Kaeya

data structures, dp, hashing, number theory

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

Going Home

brute force, hashing, implementation, math

Common Divisors

brute force, hashing, implementation, math, strings

King's Path

dfs and similar, graphs, hashing, shortest paths

Power Products

hashing, math, number theory

Strange Definition

bitmasks, graphs, hashing, math, number theory

Watto and Mechanism

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

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Camp Schedule

greedy, hashing, strings

Compress Words

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

Kostya the Sculptor

data structures, hashing

Sasha and One More Name

constructive algorithms, hashing, strings

Queries for Number of Palindromes

dp, hashing, strings

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Palindromic characteristics

brute force, dp, hashing, strings

Erase and Extend (Easy Version)

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

Let's Play the Words?

data structures, hashing, implementation, math

Full Turn

geometry, hashing, number theory

New Year and Conference

binary search, data structures, hashing, sortings

Palindrome Pairs

hashing, strings

Palindrome Degree

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

Spelling Check

hashing, implementation, strings

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

Ray Tracing

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

Double Profiles

graphs, hashing, sortings

Messenger

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

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Sets

constructive algorithms, hashing, implementation

Funny Substrings

data structures, hashing, implementation, matrices, strings

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

LIS of Sequence

data structures, dp, greedy, hashing, math

Om Nom and Necklace

hashing, string suffix structures, strings

A Bit Similar

bitmasks, brute force, hashing, string suffix structures, strings, two pointers

Make Them Similar

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

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Beaver

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

Instant Noodles

graphs, hashing, math, number theory

Test

hashing, strings

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

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Bear and Polynomials

hashing, implementation, math

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Isomorphic Strings

hashing, strings

Sereja and Squares

binary search, data structures, hashing

The Untended Antiquity

data structures, hashing

Swapping Characters

brute force, hashing, implementation, strings

Frequency of String

hashing, string suffix structures, strings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Zip-line

binary search, data structures, dp, hashing

Reachable Strings

data structures, hashing, strings

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Restoring the Expression

brute force, hashing, math

Acyclic Organic Compounds

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

Good Substrings

hashing, strings

String Compression

dp, hashing, string suffix structures, strings

String Set Queries

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

The Number of Subpermutations

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

Ann and Books

data structures, flows, hashing

Deletion of Repeats

greedy, hashing, string suffix structures

Abbreviation

dp, hashing, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Encoding

hashing, string suffix structures, strings

Peterson Polyglot

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

Death Stars (medium)

hashing, strings

Marbles

hashing, strings

Games on a CD

data structures, hashing, string suffix structures, strings

Morse Code

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

Labelling Cities

dfs and similar, graphs, hashing

The Supersonic Rocket

geometry, hashing, strings

Song of the Sirens

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

Complete Mirror

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

Regular Forestation

hashing, trees

Permutation

data structures, divide and conquer, hashing

Cutting Jigsaw Puzzle

hashing, implementation