> For the complete documentation index, see [llms.txt](https://blog.yushunchen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://blog.yushunchen.com/algo/string.md).

# String

- [Longest Substring Without Repeating Characters](https://blog.yushunchen.com/algo/string/longest-substring-without-repeating-characters.md): ID: 3; medium
- [Roman to Integer](https://blog.yushunchen.com/algo/string/roman-to-integer.md): ID: 13; easy
- [Implement strStr()](https://blog.yushunchen.com/algo/string/implement-strstr.md): ID: 28; easy
- [Reverse Words in a String](https://blog.yushunchen.com/algo/string/reverse-words-in-a-string.md): ID: 151; medium
- [First Unique Character in a String](https://blog.yushunchen.com/algo/string/first-unique-character-in-a-string.md): ID: 209; easy
- [Count Unique Characters of All Substrings of a Given String](https://blog.yushunchen.com/algo/string/count-unique-characters-of-all-substrings-of-a-given-string.md): ID: 828; hard