Day 24: More Linked Lists
https://www.hackerrank.com/challenges/30-linked-list-deletion/problem
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Day 23: BST Level-Order Traversal
https://www.hackerrank.com/challenges/30-binary-trees/problem
Day 22: Binary Search Trees
https://www.hackerrank.com/challenges/30-binary-search-trees/problem
Day 21: Generics
https://www.hackerrank.com/challenges/30-generics/problem
Day 20: Sorting
https://www.hackerrank.com/challenges/30-sorting/problem