Strings
Problems on strings, including searching for a substring, palindromes, anagrams, comparing and sorting strings, parsing and transforming text, counting characters and words, and string periods.
Narrower problem sets are under Prefix function, Z-function, Hashing and String suffix structures.
Problems
Checking for a Subsequence#3671
Very hard
Flowers Flourish from France#3750
Very easy
Line analysis#3815
Medium
Deli Deli#3836
Easy
License plates#3953
Very easy
Key Insight#4032
Hard
Word equations#4132
Very easy
Suffix automaton#4164
Medium
Pattern matching#4172
Very hard
Names#4217
Very easy
Road Series#4272
Easy
Repair#4290
Medium
Ritual Wall#4338
Hard
Game with palindromes#4366
Very easy