Basic essential data structures and coding problems for tech interviews.

Data structures:
String
Array 1D and 2D
LinkedList
Trees

Coding problems:
A. Arrays

1. TOP K Frequent elements
2. Rotate array
3. Intersection of arrays

B. String

1. Non-repeating character in a string
2. Edit distance

C. Trees and Linkedlist

1. Binary tree search
2. Validate binary search tree
3. Lowest common ancestor of a binary tree
4. Nth element of a linkedlist ( close similar problem)

Best references for practice:

1. Cracking the Coding Interview
2. Leetcode

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