Password

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

String Transformation

hashing, strings

Petr#

brute force, data structures, hashing, strings

Sets

constructive algorithms, hashing, implementation

Beaver

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

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Cutting Jigsaw Puzzle

hashing, implementation

Spelling Check

hashing, implementation, strings

Tricky and Clever Password

binary search, constructive algorithms, data structures, greedy, hashing, strings

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Test

hashing, strings

Deletion of Repeats

greedy, hashing, string suffix structures

Palindrome Degree

hashing, strings

Registration System

data structures, hashing, implementation

Winner

hashing, implementation