Substring and Subsequence

bitmasks, brute force, dp, graphs, greedy, hashing, strings, trees

Yasya and the Mysterious Tree

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

Collapsing Strings

data structures, strings, trees

Guess Game

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

Queries for the Array

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

Lisa and the Martians

bitmasks, greedy, math, strings, trees

Comfortably Numb

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

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

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

Middle Duplication

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

Alphabetic Tree

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

Death DBMS

data structures, string suffix structures, strings, trees

XOR Inverse

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

String Transformation 1

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

Dr. Evil Underscores

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

Find String in a Grid

data structures, dp, strings, trees

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Indie Album

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

Speed Dial

dp, strings, trees

Tree and XOR

strings, trees

Moonwalk challenge

data structures, strings, trees

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Short Code

data structures, dp, greedy, strings, trees

Autocompletion

*special problem, strings, trees

Perfect Security

data structures, greedy, strings, trees

Upside Down

data structures, string suffix structures, strings, trees

Similar Words

dp, hashing, strings, trees

Rap God

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

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Generating Sets

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

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Xors on Segments

data structures, strings, trees

Running Track

dp, greedy, strings, trees

Acyclic Organic Compounds

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

Matching Names

dfs and similar, strings, trees

Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

Mike and Friends

data structures, string suffix structures, strings, trees

Work Group

dfs and similar, dp, graphs, strings, trees

A Lot of Games

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

e-Government

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