Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Instant Noodles

graphs, hashing, math, number theory

Pattern Matching

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

Double Profiles

graphs, hashing, sortings

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

BinCoin

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

Deletion of Repeats

greedy, hashing, string suffix structures

Abbreviation

dp, hashing, strings

Bear and Polynomials

hashing, implementation, math

Swapping Characters

brute force, hashing, implementation, strings

Division + LCP (hard version)

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

President and Roads

dfs and similar, graphs, hashing, shortest paths

Prefix Function Queries

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

Symmetree

dfs and similar, hashing, implementation, trees

LIS of Sequence

data structures, dp, greedy, hashing, math

Om Nom and Necklace

hashing, string suffix structures, strings

Test

hashing, strings

Palindrome Degree

hashing, strings

Erase and Extend (Hard Version)

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

Counter Attack

data structures, dsu, graphs, hashing, sortings

Check Transcription

brute force, data structures, hashing, strings

Messenger

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

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Two strings

binary search, hashing, strings, two pointers

String

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

Preorder

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

Funny Substrings

data structures, hashing, implementation, matrices, strings

New Year and Conference

binary search, data structures, hashing, sortings

GCD of an Array

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

Fractal Detector

dp, hashing

Death Stars (medium)

hashing, strings

Tree-String Problem

*special problem, dfs and similar, hashing, strings

New Year and Ancient Prophecy

dp, hashing, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Petr#

brute force, data structures, hashing, strings

No Palindromes

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

Non-Palindromic Substring

hashing, implementation, math, strings

Masha-forgetful

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

The Strongest Build

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

Watto and Mechanism

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

Compress Words

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

Felicity is Coming!

data structures, hashing, sortings, strings

Spy Syndrome 2

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

Let's Play the Words?

data structures, hashing, implementation, math

Division + LCP (easy version)

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

Shuffling Songs

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

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

Kirei and the Linear Function

hashing, math

Magical Array

constructive algorithms, hashing, implementation, math

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Strange Definition

bitmasks, graphs, hashing, math, number theory

Gargari and Bishops

greedy, hashing, implementation

Cutting Jigsaw Puzzle

hashing, implementation

Beaver

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

Ray Tracing

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

Correcting Mistakes

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

Sasha and One More Name

constructive algorithms, hashing, strings

Queries for Number of Palindromes

dp, hashing, strings

Power Products

hashing, math, number theory

King's Path

dfs and similar, graphs, hashing, shortest paths

Going Home

brute force, hashing, implementation, math

Prefix-Suffix Palindrome (Hard version)

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

Good Substrings

hashing, strings

Sets

constructive algorithms, hashing, implementation

Full Turn

geometry, hashing, number theory

Meta-set

brute force, combinatorics, data structures, hashing, math

Fixed Prefix Permutations

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

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Required Length

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

Equivalent Strings

divide and conquer, hashing, sortings, strings

Spy-string

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

Password

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

Kostya the Sculptor

data structures, hashing

Palindrome Pairs

hashing, strings

Camp Schedule

greedy, hashing, strings

Character Blocking

data structures, hashing, implementation

Binary String Copying

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

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

Spelling Check

hashing, implementation, strings

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Zero Quantity Maximization

hashing, math, number theory

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Diluc and Kaeya

data structures, dp, hashing, number theory

Winner

hashing, implementation

Common Divisors

brute force, hashing, implementation, math, strings

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

String Equality

dp, greedy, hashing, implementation, strings

Yarik and Musical Notes

hashing, math, number theory

Reverse String

brute force, dp, hashing, implementation, strings

OR in Matrix

greedy, hashing, implementation

Registration System

data structures, hashing, implementation

Weight of the System of Nested Segments

greedy, hashing, implementation, sortings

Remove Two Letters

data structures, greedy, hashing, strings

Same Differences

data structures, hashing, math

Vitaliy and Pie

greedy, hashing, strings