GCJ2010 Round1B A "File Fix-It"

問題：http://code.google.com/codejam/contest/dashboard?c=635101#s=p0

import java.io.File;
import java.io.PrintWriter;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class FileFixIt {
	public static void main(String[] args) throws Exception {
		String filename = "A-large-practice";
		Scanner scan = new Scanner(new File(filename + ".in"));
		PrintWriter out = new PrintWriter(new File(filename + ".out"));
		int T = scan.nextInt();
		for (int t = 0; t++ < T;) {
			int N = scan.nextInt();
			int M = scan.nextInt();
			int count = 0;
			Set<String> set = new HashSet<String>();
			for (int i = N + M; i-- > 0;) {
				String dir = scan.next() + "/";
				for (int sp = dir.indexOf('/', 1); sp >= 0; sp = dir.indexOf('/',
						sp + 1)) {
					if (set.add(dir.substring(0, sp)) && i < M) {
						count++;
					}
				}
			}
			String result = "" + count;
			out.printf("Case #%d: %s\n", t, result);
		}
		out.flush();
	}
}