Infinite Set

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

Queries for Number of Palindromes

dp, hashing, strings

Xor-Subsequence (easy version)

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

Make Palindrome

constructive algorithms, greedy, strings

Lisa and the Martians

bitmasks, greedy, math, strings, trees

Cloud of Hashtags

binary search, greedy, implementation, strings

Irreducible Anagrams

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

Sasha and One More Name

constructive algorithms, hashing, strings

Perfect Security

data structures, greedy, strings, trees

Circus

brute force, greedy, math, strings

ZgukistringZ

brute force, constructive algorithms, implementation, strings

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

Reberland Linguistics

dp, implementation, strings

Lexicography

constructive algorithms, strings

Exponential notation

implementation, strings

Correcting Mistakes

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

Beaver

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

Palindromic Cut

brute force, implementation, strings

Anagram

greedy, strings

Vasya and Types

implementation, strings

Ali goes shopping

*special problem, brute force, strings

Longest Regular Bracket Sequence

constructive algorithms, data structures, dp, greedy, sortings, strings

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

String Reversal

data structures, greedy, strings

Binary Literature

constructive algorithms, greedy, implementation, strings, two pointers

AB-string

binary search, combinatorics, dp, strings

A Lot of Games

dfs and similar, dp, games, implementation, strings, trees

Print a 1337-string...

combinatorics, constructive algorithms, math, strings

Archaeology

brute force, constructive algorithms, greedy, strings

Median String

bitmasks, math, number theory, strings

Palindromic characteristics

brute force, dp, hashing, strings

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Collapsing Strings

data structures, strings, trees

Dasha and Nightmares

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

Unique Palindromes

constructive algorithms, math, strings

Professor Higashikata

data structures, dsu, greedy, implementation, strings

Alyona and Strings

dp, strings

Generating Sets

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

Shuffling Songs

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

Subsequences (hard version)

dp, strings

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Chladni Figure

brute force, strings

Spy Syndrome 2

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

Fancy Number

brute force, greedy, sortings, strings

Felicity is Coming!

data structures, hashing, sortings, strings

Dense Subsequence

data structures, greedy, strings

Jabber ID

implementation, strings

Two Strings

data structures, dp, strings

Logging

implementation, strings

Palindromes

dp, strings

Autocompletion

*special problem, strings, trees

Name

greedy, strings

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

Compress Words

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

Watto and Mechanism

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

Number of Subsequences

combinatorics, dp, strings

K-beautiful Strings

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

XOR Inverse

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

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Reverse

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

Masha-forgetful

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

Lucky Common Subsequence

dp, strings

Linguistics

greedy, implementation, sortings, strings

Non-Palindromic Substring

hashing, implementation, math, strings

Equalizing Two Strings

constructive algorithms, sortings, strings

Kirk and a Binary String (easy version)

brute force, greedy, strings

Famil Door and Brackets

dp, strings

Petr#

brute force, data structures, hashing, strings

Ability To Convert

constructive algorithms, dp, greedy, math, strings

No Palindromes

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

Obsessive String

dp, strings

New Year and Ancient Prophecy

dp, hashing, strings

Work Group

dfs and similar, dp, graphs, strings, trees

Running Track

dp, greedy, strings, trees

The Fair Nut and Strings

greedy, strings

Pretty Song

math, strings

Sereja and Periods

binary search, dfs and similar, strings

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Last Chance

data structures, implementation, strings

Death Stars (medium)

hashing, strings

Log Stream Analysis

binary search, brute force, implementation, strings

Calendar

greedy, strings

Diverse Substrings

dp, strings, two pointers

Subsequences of Length Two

dp, strings

Bracket Walk

data structures, greedy, strings

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Minimax

constructive algorithms, greedy, strings

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Funny Substrings

data structures, hashing, implementation, matrices, strings

Hossam and (sub-)palindromic tree

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

Promising String (hard version)

data structures, implementation, math, strings

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

String

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

Grime Zoo

brute force, greedy, implementation, strings

Two strings

binary search, hashing, strings, two pointers

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Unstable String Sort

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

Rearrange Brackets

brute force, dp, greedy, sortings, strings

Cut Substrings

combinatorics, dp, hashing, strings, two pointers