String

• Longest Substring Without Repeating Characters - https://leetcode.com/problems/longest-substring-without-repeating-characters/

• Longest Repeating Character Replacement - https://leetcode.com/problems/longest-repeating-character-replacement/

• Minimum Window Substring - https://leetcode.com/problems/minimum-window-substring/

• Valid Anagram - https://leetcode.com/problems/valid-anagram/

• Group Anagrams - https://leetcode.com/problems/group-anagrams/

• Valid Parentheses - https://leetcode.com/problems/valid-parentheses/

• Valid Palindrome - https://leetcode.com/problems/valid-palindrome/

• Longest Palindromic Substring - https://leetcode.com/problems/longest-palindromic-substring/

• Palindromic Substrings - https://leetcode.com/problems/palindromic-substrings/

• Encode and Decode Strings (Leetcode Premium) - https://leetcode.com/problems/encode-and-decode-strings/