Hard (11)

Medium

1. Count Number of Substrings
   • GFG
   • LeetCode
2. Longest Palindromic Substring
   • Manacher’s algorithm

Hard

1. Minimum number of bracket reversals to make an expression balanced
2. Count and say
3. Hashing In Strings | Theory
4. Rabin Karp Algorithm
5. Z function
6. KMP Algorithm or LPS array
7. Shortest Palindrome
8. Longest happy prefix
9. Count Palindromic Subsequences