package dancinggooglers;

import java.io.File;
import java.util.Scanner;

public class DanceScoreCalculator {


    public static void main(String[] args) {
        if(args.length <= 0 || args[0] == null) {
            System.out.println("You must enter a file to read");
            System.out.println("Usage: blah <filename>");
            System.exit(0);
        }

        File argFile = new File(args[0]);
        try {
            Scanner googleSpeakScanner = new Scanner(argFile);
            String firstLine = googleSpeakScanner.nextLine();
            Integer linesToScan = new Integer(firstLine);
            for(int i = 1; i <= linesToScan; i++) {
                String googleDancerLine = googleSpeakScanner.nextLine();
                DanceScoreCase danceCase = new DanceScoreCase(googleDancerLine);
                System.out.println(String.format("Case #%d: %d", i, danceCase.maxDancersThatCouldPass()));
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package fixjava;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

public abstract class Filter<T> {

	abstract boolean accept(T item);

	public static <U> ArrayList<U> list(Iterable<U> collection, Filter<U> filter) {
		ArrayList<U> filtered = new ArrayList<U>();
		for (U item : collection)
			if (filter.accept(item))
				filtered.add(item);
		return filtered;
	}

	public static <U> HashSet<U> set(Set<U> set, Filter<U> filter) {
		HashSet<U> filtered = new HashSet<U>();
		for (U item : set)
			if (filter.accept(item))
				filtered.add(item);
		return filtered;
	}

	public static <K, V> HashMap<K, V> mapKeys(Map<K, V> map, Filter<K> keyFilter) {
		HashMap<K, V> filtered = new HashMap<K, V>();
		for (Entry<K, V> ent : map.entrySet())
			if (keyFilter.accept(ent.getKey()))
				filtered.put(ent.getKey(), ent.getValue());
		return filtered;
	}

	public static <K, V> HashMap<K, V> mapValues(Map<K, V> map, Filter<V> valueFilter) {
		HashMap<K, V> filtered = new HashMap<K, V>();
		for (Entry<K, V> ent : map.entrySet())
			if (valueFilter.accept(ent.getValue()))
				filtered.put(ent.getKey(), ent.getValue());
		return filtered;
	}
}
