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
Roman numerals#7
Easy
Fibonacci Numbers#73
Very easy
First non-palindrome#205
Very easy
Type printer#274
Medium
Champion Word#330
Medium
Mysterious Note#378
Very easy
Incorrect addition#463
Very easy
Super palindromes#470
Very easy
Inexact string#486
Very hard
Coding#490
Very easy
AEIOUY#494
Very easy
New compiler#506
Very easy
Funny Language#526
Very hard
Playfair Cipher#550
Medium