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
Keven#8495
Very hard
String length#8569
Very easy
Length of words#8570
Very easy
Count the letters#8571
Very easy
Square string#8697
Very easy
Magic#8720
Hard
Elections#8746
Hard
Indexes of spaces#8981
Very easy
Delete a fragment#8986
Very easy
Character replacement 2#8988
Very easy
Compose a word#8993
Very easy
Make a word 2#8994
Very easy
ABA#9594
Very easy
toUpperCase#9625
Very easy
startsWith endsWith#9626
Very easy
Candy Chain#9673
Very hard
Crosswords#9688
Hard