> For the complete documentation index, see [llms.txt](https://algorithm.prettylog.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string.md).

# String

- [x 76. Minimum Window Substring](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/x-76.-minimum-window-substring.md)
- [647. Palindromic Substrings](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/647.-palindromic-substrings.md)
- [x 5. Longest Palindromic Substring](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/x-5.-longest-palindromic-substring.md)
- [125. Valid Palindrome](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/125.-valid-palindrome.md)
- [20. Valid Parentheses](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/20.-valid-parentheses.md)
- [49. Group Anagrams](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/49.-group-anagrams.md)
- [242. Valid Anagram](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/242.-valid-anagram.md)
- [5. Longest Palindromic Substring](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/5.-longest-palindromic-substring.md)
- [3. Longest Substring Without Repeating Characters](https://algorithm.prettylog.com/top-75-leetcode-questions-to-save-your-time/problems/string/3.-longest-substring-without-repeating-characters.md)