/**
* Reads in a an integer <tt>N</tt> and a sequence of pairs of integers (between <tt>0</tt> and
* <tt>N-1</tt>) from standard input, where each integer in the pair represents some site; if the
* sites are in different components, merge the two components and print the pair to standard
* output.
*/
public static void main(String[] args) {
for (int N = 250; N <= 10000000; N *= 1.25) {
double time = quickUnion(N);
StdOut.printf("%7d %5.1f\n", N, time);
FileOut.print(N);
FileOut.print("\t");
FileOut.println(time);
}
}
private static double quickUnion(int n) {
Stopwatch timer = new Stopwatch();
UFQuickUnion uf = new UFQuickUnion(n);
for (int i = 0; i < n; i++) {
int p = StdRandom.uniform(n);
int q = StdRandom.uniform(n);
if (uf.connected(p, q)) continue;
uf.union(p, q);
// StdOut.println(p + " " + q);
}
StdOut.println(uf.count() + " components");
return timer.elapsedTime();
}
/** Unit tests the <tt>TransitiveClosure</tt> data type. */
public static void main(String[] args) {
In in = new In(args[0]);
Digraph G = new Digraph(in);
TransitiveClosure tc = new TransitiveClosure(G);
// print header
StdOut.print(" ");
for (int v = 0; v < G.V(); v++) StdOut.printf("%3d", v);
StdOut.println();
StdOut.println("--------------------------------------------");
// print transitive closure
for (int v = 0; v < G.V(); v++) {
StdOut.printf("%3d: ", v);
for (int w = 0; w < G.V(); w++) {
if (tc.reachable(v, w)) StdOut.printf(" T");
else StdOut.printf(" ");
}
StdOut.println();
}
}