Add algorithm notes and revise header

Add algorithm comments to XOR Operation solution

Document running sum algorithm and mark revised

Compute max manually and rename vars

Add numpy import and algorithm explanation

revised 905. Sort Array By Parity

Update Binary Search file comments and algorithm

Add algorithm comments to Baseball Game solution

Add algorithm comments and 'revised' note

revised and Document algorithm in Max Consecutive Ones

add the revised 412. Fizz Buzz problem

Solve 387. First Unique Character in a String with another approach

Document solution: add revision note and algorithm

Add notes and algorithm to reverse string

Document algorithm and add alternate approach