Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Atilla's Favorite Problem

greedy, implementation, strings

Yes-Yes?

implementation, strings

SSeeeeiinngg DDoouubbllee

constructive algorithms, strings

Majority

combinatorics, dp, math, strings

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Diverse Substrings

brute force, implementation, strings

Smaller

constructive algorithms, greedy, strings

Compare T-Shirt Sizes

implementation, implementation, strings

Keyboard Design

bitmasks, data structures, dp, string suffix structures, strings

Palindrome Addicts

data structures, strings

Ela Sorting Books

greedy, implementation, strings

Equal Binary Subsequences

constructive algorithms, geometry, greedy, implementation, strings

Phase Shift

dfs and similar, dsu, graphs, greedy, implementation, strings

Prefixes and Suffixes

constructive algorithms, strings, two pointers

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Jumping on Tiles

constructive algorithms, strings

Decode String

greedy, strings

Prefix Function Queries

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

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Color with Occurrences

brute force, data structures, dp, greedy, strings

Recover an RBS

constructive algorithms, greedy, implementation, strings

Another String Minimization Problem

2-sat, constructive algorithms, greedy, string suffix structures, strings

Mio and Lucky Array

constructive algorithms, fft, math, strings

Double Strings

brute force, data structures, strings

Cypher

brute force, implementation, strings

YES or YES?

brute force, implementation, strings

Text Editor

brute force, dp, greedy, strings

awoo's Favorite Problem

binary search, constructive algorithms, data structures, greedy, implementation, strings, two pointers

Sum of Substrings

brute force, constructive algorithms, greedy, math, strings

Shifting String

graphs, math, number theory, strings

Manipulating History

constructive algorithms, greedy, strings

Linguistics

greedy, implementation, sortings, strings

Digit Minimization

constructive algorithms, games, math, strings

Palindromic Indices

greedy, strings

Binary String

binary search, greedy, strings, two pointers

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Most Similar Words

brute force, greedy, implementation, implementation, math, strings

Replace With the Previous, Minimize

dsu, greedy, strings

Infinite Replacement

combinatorics, implementation, strings

A Perfectly Balanced String?

brute force, greedy, strings

Subtle Substring Subtraction

games, greedy, strings

Dorms War

brute force, implementation, strings

2-Letter Strings

data structures, math, strings

Six Characters

*special problem, constructive algorithms, strings

In Every Generation...

*special problem, strings

Evolution of Weasels

greedy, implementation, strings

Toys

greedy, strings

Promising String (hard version)

data structures, implementation, math, strings

Promising String (easy version)

brute force, implementation, math, strings

Get an Even String

dp, greedy, strings

Bit Flipping

bitmasks, constructive algorithms, greedy, strings

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Prefix Removals

strings

Deletions of Two Adjacent Letters

implementation, strings

Infinite Set

bitmasks, dp, math, matrices, number theory, strings

Reverse and Concatenate

greedy, strings

Peculiar Movie Preferences

greedy, strings

Minor Reduction

greedy, strings

Masha-forgetful

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

Palindromes Coloring

binary search, greedy, sortings, strings

Middle Duplication

data structures, dfs and similar, greedy, strings, trees

Square String?

implementation, strings

Reverse

bitmasks, constructive algorithms, dfs and similar, implementation, math, strings

Forbidden Subsequence

constructive algorithms, greedy, sortings, strings

Lexicographically Small Enough

brute force, data structures, greedy, strings

Mirror in the String

greedy, strings

William the Vigilant

implementation, strings

Alphabetic Tree

binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees

Linear Keyboard

implementation, strings

AB Balance

strings

Dominant Character

brute force, greedy, implementation, strings

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Make Them Equal

brute force, greedy, math, strings

Strange LCS

bitmasks, dp, graphs, greedy, strings

Grandma Capa Knits a Scarf

brute force, data structures, greedy, strings, two pointers

Casimir's String Solitaire

math, strings

Higher Order Functions

implementation, strings

Holiday Wall Ornaments

dp, strings

Another Sorting Problem

data structures, sortings, strings

Domino Disaster

implementation, strings

Rescue Niwen!

dp, greedy, string suffix structures, strings

Polycarp and String Transformation

binary search, implementation, sortings, strings

Make a Power of Two

greedy, math, strings

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Diane

constructive algorithms, greedy, strings

Backspace

dp, greedy, strings, two pointers

Reverse String

brute force, dp, hashing, implementation, strings

Subsequence Permutation

sortings, strings

Interesting Story

greedy, sortings, strings

Wonderful Coloring - 1

greedy, strings

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

Alphabetical Strings

greedy, implementation, strings

Love Song

dp, implementation, strings

Funny Substrings

data structures, hashing, implementation, matrices, strings

Erase and Extend (Hard Version)

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