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

Erase and Extend (Easy Version)

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

Prinzessin der Verurteilung

brute force, constructive algorithms, strings

String Distance

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

Unstable String

binary search, dp, greedy, implementation, strings, two pointers

Prefixes and Suffixes

*special problem, strings

Minimax

constructive algorithms, greedy, strings

Kill Anton

brute force, constructive algorithms, data structures, math, strings

A-B Palindrome

constructive algorithms, implementation, strings

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Min Cost String

brute force, constructive algorithms, graphs, greedy, strings

Binary Literature

constructive algorithms, greedy, implementation, strings, two pointers

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Double-ended Strings

brute force, implementation, strings

Déjà Vu

constructive algorithms, strings

Chaotic Merge

combinatorics, dp, math, strings

Split it!

brute force, constructive algorithms, greedy, strings

Enormous XOR

bitmasks, constructive algorithms, greedy, math, strings, two pointers

K-beautiful Strings

binary search, brute force, constructive algorithms, greedy, strings

Space Navigation

greedy, strings

Yet Another String Game

games, greedy, strings

Pattern Matching

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

Program

data structures, dp, implementation, strings

String LCM

brute force, math, number theory, strings

A Bit Similar

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

Song of the Sirens

combinatorics, divide and conquer, hashing, math, string suffix structures, strings

Canine poetry

dp, greedy, strings

Last Year's Substring

dp, implementation, strings

String Equality

dp, greedy, hashing, implementation, strings

Non-Substring Subsequence

dp, greedy, implementation, strings

Catching Cheaters

dp, strings

Death DBMS

data structures, string suffix structures, strings, trees

Cyclic Shifts

*special problem, strings

String Reversal

data structures, greedy, strings

ABBB

brute force, data structures, greedy, strings

Number of Subsequences

combinatorics, dp, strings

Minlexes

dp, greedy, implementation, strings

Palindromifier

constructive algorithms, strings

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Poman Numbers

bitmasks, greedy, math, strings

Grime Zoo

brute force, greedy, implementation, strings

Subsequences of Length Two

dp, strings

Balanced Bitstring

implementation, strings

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

String Similarity

constructive algorithms, strings

Juggling Letters

greedy, strings

Boboniu and Banknote Collection

strings

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Common Prefixes

constructive algorithms, greedy, strings

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Acacius and String

brute force, implementation, strings

Move Brackets

greedy, strings

AccurateLee

greedy, implementation, strings

Codeforces Subsequences

brute force, constructive algorithms, greedy, math, strings

Short Substrings

implementation, strings

Construct the String

data structures, dp, strings

Rotating Substrings

dp, strings

Subsequence Hate

implementation, strings

Spy-string

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

Phoenix and Distribution

constructive algorithms, greedy, sortings, strings

Binary Period

constructive algorithms, strings

Kaavi and Magic Spell

dp, strings

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Elementary!

*special problem, brute force, dp, strings

Prefix-Suffix Palindrome (Hard version)

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

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings