Assignment Specification
http://coursera.cs.princeton.edu/algs4/assignments/percolation.html
Checklist
https://coursera.cs.princeton.edu/algs4/assignments/percolation/faq.php
http://coursera.cs.princeton.edu/algs4/assignments/percolation.html
https://coursera.cs.princeton.edu/algs4/assignments/percolation/faq.php