Adding Tim Sort sorting algorithm

Adding some Leetcode Hashtable related solutions

Dynamic Programming solns

Adding iterative tree traversals

New array problems

first non-repeating and first duplicate prblms

Adding longest palindromic substr

Some more problems

Adding a way to print matrix in a spiral way

Adding bubble and selection sort

Middle node of linked list

Adding binary search tree comparator

Updating anagram description

Adding ternary search tree impl

Adding Trie data structure