The Number of Subpermutations

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

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

President and Roads

dfs and similar, graphs, hashing, shortest paths

Ann and Books

data structures, flows, hashing

A-Z Graph

constructive algorithms, data structures, graphs, hashing

String Set Queries

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

Isomorphic Strings

hashing, strings

Beaver

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

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Frequency of String

hashing, string suffix structures, strings

Prefix Function Queries

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

A Bit Similar

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

Symmetree

dfs and similar, hashing, implementation, trees

Make Them Similar

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

Kefa and Watch

data structures, hashing, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Check Transcription

brute force, data structures, hashing, strings

Messenger

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

LIS of Sequence

data structures, dp, greedy, hashing, math

Sets

constructive algorithms, hashing, implementation

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Instant Noodles

graphs, hashing, math, number theory

Om Nom and Necklace

hashing, string suffix structures, strings

Ray Tracing

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

Test

hashing, strings

Correcting Mistakes

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

Pattern Matching

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

Felicity is Coming!

data structures, hashing, sortings, strings

Two strings

binary search, hashing, strings, two pointers

String

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

New Year and Ancient Prophecy

dp, hashing, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Spy Syndrome 2

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

Preorder

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

Double Profiles

graphs, hashing, sortings

Petr#

brute force, data structures, hashing, strings

Spelling Check

hashing, implementation, strings

Funny Substrings

data structures, hashing, implementation, matrices, strings

No Palindromes

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

New Year and Conference

binary search, data structures, hashing, sortings

Let's Play the Words?

data structures, hashing, implementation, math

Non-Palindromic Substring

hashing, implementation, math, strings

Shuffling Songs

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

Palindrome Degree

hashing, strings

Full Turn

geometry, hashing, number theory

Dasha and Nightmares

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

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Palindromic characteristics

brute force, dp, hashing, strings

Masha-forgetful

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

Kirei and the Linear Function

hashing, math

Palindrome Pairs

hashing, strings

Kostya the Sculptor

data structures, hashing

Sasha and One More Name

constructive algorithms, hashing, strings

The Strongest Build

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

GCD of an Array

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

Magical Array

constructive algorithms, hashing, implementation, math

Treasure Island

dfs and similar, dp, flows, hashing

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Erase and Extend (Hard Version)

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

Meta-set

brute force, combinatorics, data structures, hashing, math

Camp Schedule

greedy, hashing, strings

Fixed Prefix Permutations

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

Queries for Number of Palindromes

dp, hashing, strings

Strange Definition

bitmasks, graphs, hashing, math, number theory

Watto and Mechanism

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

Compress Words

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

Power Products

hashing, math, number theory

Character Blocking

data structures, 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

Gargari and Bishops

greedy, hashing, implementation

Going Home

brute force, hashing, implementation, math

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Required Length

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

Prefix-Suffix Palindrome (Hard version)

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

Binary String Copying

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

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Equivalent Strings

divide and conquer, hashing, sortings, strings

Zero Quantity Maximization

hashing, math, number theory

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Spy-string

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

Yarik and Musical Notes

hashing, math, number theory

Erase and Extend (Easy Version)

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

Sequence Pair Weight

hashing, implementation, math

Diluc and Kaeya

data structures, dp, hashing, number theory

Reverse String

brute force, dp, hashing, implementation, strings

Vitaliy and Pie

greedy, hashing, strings

String Equality

dp, greedy, hashing, implementation, strings

Weight of the System of Nested Segments

greedy, hashing, implementation, sortings

OR in Matrix

greedy, hashing, implementation

Password

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

Remove Two Letters

data structures, greedy, hashing, strings

Winner

hashing, implementation

Same Differences

data structures, hashing, math

Registration System

data structures, hashing, implementation