Leetcode video time

May 24, 2015

Spent time to watch the video about stack. Very good video. on May 24, 2015

http://www.julyedu.com/video/play/id/30

There is a lecture to explain the question to find last k number maximum number.

Look up Catalan combination problem.

http://en.wikipedia.org/wiki/Catalan_number

http://www.geeksforgeeks.org/k-largestor-smallest-elements-in-an-array/