HackerRank: Matrix Rotation (Series 3 of 5) - using extra space - an array

April 18, 2016 
Rotate array - HackerRank

problem statement:
https://www.hackerrank.com/challenges/matrix-rotation-algo

Study other's code:

https://gist.github.com/jianminchen/9005cbbbbbd60e307759747856e3a35a

Write a solution using the same idea. Try to practice 20 - 30 minutes.

Just be simple; Read other people's code, like it; and then, write exactly same idea, and see if you can make it work as well.

Write same algorithm again and again, use various ideas; same idea, write again and again, see if you can improve the performance, more concentration - write the program from hours to 30 minutes, less than 10 minutes. Practice makes perfect.

To be continued:
Action item:

Will write my own version of implementation.