Vitaliy and Pie

greedy, hashing, strings

Same Differences

data structures, hashing, math

Remove Two Letters

data structures, greedy, hashing, strings

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

Yarik and Musical Notes

hashing, math, number theory

String Equality

dp, greedy, hashing, implementation, strings

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

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

Binary String Copying

binary search, brute force, data structures, hashing, strings

Character Blocking

data structures, hashing, implementation

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

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Fixed Prefix Permutations

binary search, bitmasks, data structures, hashing, math, sortings

Meta-set

brute force, combinatorics, data structures, hashing, math

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

Queries for Number of Palindromes

dp, hashing, strings

Sasha and One More Name

constructive algorithms, 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

Magical Array

constructive algorithms, hashing, implementation, math

Kirei and the Linear Function

hashing, math

Palindromic characteristics

brute force, dp, hashing, strings

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Dasha and Nightmares

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

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Division + LCP (easy version)

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

Let's Play the Words?

data structures, hashing, implementation, math

Spy Syndrome 2

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

Felicity is Coming!

data structures, hashing, sortings, strings

Compress Words

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

Watto and Mechanism

binary search, data structures, hashing, 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

Non-Palindromic Substring

hashing, implementation, math, strings

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Petr#

brute force, data structures, hashing, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

New Year and Ancient Prophecy

dp, 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

Preorder

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

String

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

Two strings

binary search, hashing, strings, two pointers

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

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

Erase and Extend (Hard Version)

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

Palindrome Degree

hashing, strings

Test

hashing, strings

Om Nom and Necklace

hashing, string suffix structures, strings

LIS of Sequence

data structures, dp, greedy, hashing, math

Symmetree

dfs and similar, hashing, implementation, trees

Prefix Function Queries

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

President and Roads

dfs and similar, graphs, hashing, shortest paths

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Swapping Characters

brute force, hashing, implementation, strings

Bear and Polynomials

hashing, implementation, math

Abbreviation

dp, hashing, strings

Deletion of Repeats

greedy, hashing, string suffix structures

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

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