[LC] Update solution for jump game 2.
[LC] Update solution for wildcard matching.
Add string calculator.
Binary tree serialization and deserialization.
Add solution to count working years.
Add solution to box challenge.
Add topological sort.
Add solution to count number appearances in sorted array.
Add solution to min chars to apppend to make palindrome.
Add solution to longest common subsequence.
Add solution to longest common substring.
Add solution to minimum insertions to form a palindrome.
Add solution to minimum window substring.
[LC] Add solution to wildcard matching.
[LC] Add time limited exceeded solution to word ladder 2.
Add solution to pattern string matching.
[LC] Add solution to word ladder.
Add solution to letter combinations of phone number.
Add solution to sort colors.
Add solution to one edit apart.