# Prefix & each position substring

- [2707. Extra Characters in a String](/cracking-leetcode/dynamic-programming/prefix-and-each-position-substring/2707.-extra-characters-in-a-string.md)
- [3291. Minimum Number of Valid Strings to Form Target I](/cracking-leetcode/dynamic-programming/prefix-and-each-position-substring/3291.-minimum-number-of-valid-strings-to-form-target-i.md)
