Registration System

data structures, hashing, implementation

Same Differences

data structures, hashing, math

Winner

hashing, implementation

Remove Two Letters

data structures, greedy, hashing, strings

Password

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

OR in Matrix

greedy, hashing, implementation

Weight of the System of Nested Segments

greedy, hashing, implementation, sortings

String Equality

dp, greedy, hashing, implementation, strings

Vitaliy and Pie

greedy, hashing, strings

Reverse String

brute force, dp, hashing, implementation, strings

Diluc and Kaeya

data structures, dp, hashing, number theory

Sequence Pair Weight

hashing, implementation, math

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

Spy-string

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

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Zero Quantity Maximization

hashing, math, number theory

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Equivalent Strings

divide and conquer, hashing, sortings, strings

Binary String Copying

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

Prefix-Suffix Palindrome (Hard version)

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

Required Length

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

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Going Home

brute force, hashing, implementation, math

Gargari and Bishops

greedy, hashing, implementation

King's Path

dfs and similar, graphs, hashing, shortest paths

Common Divisors

brute force, hashing, implementation, math, strings

Character Blocking

data structures, hashing, implementation

Power Products

hashing, math, number theory

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Compress Words

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

Watto and Mechanism

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

Queries for Number of Palindromes

dp, hashing, strings

Strange Definition

bitmasks, graphs, hashing, math, number theory

Fixed Prefix Permutations

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

Camp Schedule

greedy, hashing, strings

Fixing a Binary String

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

Meta-set

brute force, combinatorics, data structures, hashing, math

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Erase and Extend (Hard Version)

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

Magical Array

constructive algorithms, hashing, implementation, math

GCD of an Array

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

The Strongest Build

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

Sasha and One More Name

constructive algorithms, hashing, strings

Palindrome Pairs

hashing, strings

Kostya the Sculptor

data structures, hashing

Kirei and the Linear Function

hashing, math

Masha-forgetful

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

Palindromic characteristics

brute force, dp, hashing, strings

Shuffling Songs

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

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Division + LCP (easy version)

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

Dasha and Nightmares

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

Full Turn

geometry, hashing, number theory

Palindrome Degree

hashing, strings

Non-Palindromic Substring

hashing, implementation, math, 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

Spelling Check

hashing, implementation, strings

''a'' String Problem

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

Funny Substrings

data structures, hashing, implementation, matrices, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Petr#

brute force, data structures, hashing, strings

Double Profiles

graphs, hashing, sortings

Spy Syndrome 2

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

Preorder

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

New Year and Ancient Prophecy

dp, hashing, strings

String

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

Two strings

binary search, hashing, strings, two pointers

Instant Noodles

graphs, hashing, math, number theory

Felicity is Coming!

data structures, hashing, sortings, strings

Test

hashing, strings

Pattern Matching

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

Correcting Mistakes

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

Check Transcription

brute force, data structures, hashing, strings

LIS of Sequence

data structures, dp, greedy, hashing, math

Ray Tracing

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

Om Nom and Necklace

hashing, string suffix structures, strings

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Sets

constructive algorithms, hashing, implementation

Messenger

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

Kefa and Watch

data structures, hashing, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Symmetree

dfs and similar, hashing, implementation, trees

Make Them Similar

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

A Bit Similar

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

Prefix Function Queries

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

Frequency of String

hashing, string suffix structures, strings

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Isomorphic Strings

hashing, strings

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

String Set Queries

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

Beaver

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

Division + LCP (hard version)

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

Ann and Books

data structures, flows, hashing

President and Roads

dfs and similar, graphs, hashing, shortest paths

A-Z Graph

constructive algorithms, data structures, graphs, hashing