public static void main(String[] args) { In in = new In(args[0]); // input file int N = in.readInt(); // N-by-N percolation system // turn on animation mode StdDraw.show(0); // repeatedly read in sites to open and draw resulting system Percolation perc = new Percolation(N); draw(perc, N); StdDraw.show(DELAY); while (!in.isEmpty()) { int i = in.readInt(); int j = in.readInt(); perc.open(i, j); draw(perc, N); StdDraw.show(DELAY); } }