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 Q2;
public class ChooseCalc {
	private long[][] chooseCache;

	public ChooseCalc(int cacheSize, boolean readyCache) {
		chooseCache = new long[cacheSize][cacheSize];
		for(int i=0;i<cacheSize;i++){
			for(int j=0;j<cacheSize;j++){
				chooseCache[i][j] = readyCache ? perm(i, j) : -1;
			}
		}
	}

	public static long perm(int n, int k){
		if(n < k) return 0;
		long $=1;
		for(int i=n;i>Math.max(k, n-k);i--){
			$ *= i;
		}
		for(int i=1;i<=Math.min(k, n-k);i++){
			$ /= i;
		}
		return $;
	}

	public long choose(int k, int n) {
		if(chooseCache[n][k] == -1) chooseCache[n][k] = perm(n, k);
		return chooseCache[n][k];
	}

	public long cached(int k, int n){
		return chooseCache[n][k];
	}
	
	public long choosewithRep(int k, int n){
		return choose(k, n)*(n-k);
	}
}
