Vitaliy and Pie

greedy, hashing, strings

Same Differences

data structures, hashing, math

Weight of the System of Nested Segments

greedy, hashing, implementation, sortings

Registration System

data structures, hashing, implementation

OR in Matrix

greedy, hashing, implementation

Reverse String

brute force, dp, hashing, implementation, strings

String Equality

dp, greedy, hashing, implementation, strings

Common Divisors

brute force, hashing, implementation, math, strings

Winner

hashing, implementation

Diluc and Kaeya

data structures, dp, hashing, number theory

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

Sequence Pair Weight

hashing, implementation, math

Erase and Extend (Easy Version)

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

Camp Schedule

greedy, hashing, strings

Kostya the Sculptor

data structures, hashing

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

Full Turn

geometry, hashing, number theory

Sets

constructive algorithms, hashing, implementation

Good Substrings

hashing, strings

Prefix-Suffix Palindrome (Hard version)

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

Going Home

brute force, hashing, implementation, math

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

Correcting Mistakes

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

Ray Tracing

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

Beaver

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

Cutting Jigsaw Puzzle

hashing, implementation

Gargari and Bishops

greedy, hashing, implementation

Strange Definition

bitmasks, graphs, hashing, math, number theory

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

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Masha-forgetful

brute force, constructive algorithms, dp, hashing, implementation, 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

GCD of an Array

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

New Year and Conference

binary search, data structures, hashing, sortings

Funny Substrings

data structures, hashing, implementation, matrices, strings

String

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

Two strings

binary search, hashing, strings, two pointers

Messenger

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

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Check Transcription

brute force, data structures, hashing, strings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Palindrome Degree

hashing, strings

LIS of Sequence

data structures, dp, greedy, hashing, math

Om Nom and Necklace

hashing, string suffix structures, strings

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

Abbreviation

dp, hashing, strings

Deletion of Repeats

greedy, hashing, string suffix structures

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Double Profiles

graphs, hashing, sortings

Pattern Matching

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

Instant Noodles

graphs, hashing, math, number theory

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Isomorphic Strings

hashing, strings

Sereja and Squares

binary search, data structures, hashing

Ann and Books

data structures, flows, hashing

Restoring the Expression

brute force, hashing, math

Games on a CD

data structures, hashing, string suffix structures, strings

Similar Words

dp, hashing, strings, trees

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

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

A-Z Graph

constructive algorithms, data structures, graphs, hashing

The Untended Antiquity

data structures, hashing

String Set Queries

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

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

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

Complete Mirror

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

Regular Forestation

hashing, trees

Liar

binary search, dp, hashing, string suffix structures