Registration System

data structures, hashing, implementation

Same Differences

data structures, hashing, math

Winner

hashing, implementation

OR in Matrix

greedy, hashing, implementation

Weight of the System of Nested Segments

greedy, hashing, implementation, sortings

Password

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

String Equality

dp, greedy, hashing, implementation, strings

Reverse String

brute force, dp, hashing, implementation, strings

Diluc and Kaeya

data structures, dp, hashing, number theory

Vitaliy and Pie

greedy, hashing, strings

Sequence Pair Weight

hashing, implementation, math

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Spy-string

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

Erase and Extend (Easy Version)

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

Equivalent Strings

divide and conquer, hashing, sortings, strings

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

Going Home

brute force, hashing, implementation, math

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

Power Products

hashing, math, number theory

Strange Definition

bitmasks, graphs, hashing, math, number theory

Required Length

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

Watto and Mechanism

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

Compress Words

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

Camp Schedule

greedy, hashing, strings

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Sasha and One More Name

constructive algorithms, hashing, strings

Erase and Extend (Hard Version)

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

Kostya the Sculptor

data structures, hashing

Queries for Number of Palindromes

dp, hashing, strings

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

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

Full Turn

geometry, hashing, number theory

Palindrome Pairs

hashing, strings

Let's Play the Words?

data structures, hashing, implementation, math

Palindrome Degree

hashing, strings

New Year and Conference

binary search, data structures, hashing, sortings

Funny Substrings

data structures, hashing, implementation, matrices, strings

New Year and Ancient Prophecy

dp, hashing, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Felicity is Coming!

data structures, hashing, sortings, strings

Spelling Check

hashing, implementation, strings

Spy Syndrome 2

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

String

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

Petr#

brute force, data structures, hashing, strings

Two strings

binary search, hashing, strings, two pointers

Double Profiles

graphs, hashing, sortings

Correcting Mistakes

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

Ray Tracing

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

Pattern Matching

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

Messenger

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

Preorder

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

Sets

constructive algorithms, hashing, implementation

LIS of Sequence

data structures, dp, greedy, hashing, math

Om Nom and Necklace

hashing, string suffix structures, strings

Instant Noodles

graphs, hashing, math, number theory

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

A Bit Similar

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

Make Them Similar

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

Test

hashing, strings

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Beaver

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

Kefa and Watch

data structures, hashing, strings

Check Transcription

brute force, data structures, hashing, strings

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Isomorphic Strings

hashing, strings

President and Roads

dfs and similar, graphs, hashing, shortest paths

Frequency of String

hashing, string suffix structures, strings

Sereja and Squares

binary search, data structures, hashing

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Bear and Polynomials

hashing, implementation, math

Counter Attack

data structures, dsu, graphs, hashing, sortings

The Untended Antiquity

data structures, hashing

Swapping Characters

brute force, hashing, implementation, strings

String Set Queries

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

Ann and Books

data structures, flows, hashing

The Number of Subpermutations

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

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Zip-line

binary search, data structures, dp, hashing

Reachable Strings

data structures, hashing, strings

Acyclic Organic Compounds

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

String Compression

dp, hashing, string suffix structures, strings

Restoring the Expression

brute force, hashing, math

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Abbreviation

dp, hashing, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Deletion of Repeats

greedy, hashing, string suffix structures

Good Substrings

hashing, strings

Games on a CD

data structures, hashing, string suffix structures, strings

Encoding

hashing, string suffix structures, strings

Permutation

data structures, divide and conquer, hashing

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Death Stars (medium)

hashing, strings