Editing 2015 Dec Bronze Problem 3 Contaminated Milk (section)

=== Java ===
<pre>
import java.io.*;
import java.util.*;

public class badmilk {
    private static int[] personDrink;
    private static int[] milkDrink;
    private static int[] timeDrink;
    private static int[] personSick;
    private static int[] timeSick;
    
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader("badmilk.in"));
        PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("badmilk.out")));

        StringTokenizer st = new StringTokenizer(br.readLine());
        int n = Integer.parseInt(st.nextToken());
        int m = Integer.parseInt(st.nextToken());
        int d = Integer.parseInt(st.nextToken());
        int s = Integer.parseInt(st.nextToken());

        initializeDrinkArrays(d, br);
        initializeSickArrays(s, br);
        
        int maxSick = 0;
        for(int i = 1; i <= m; i++) {
            if(isMilkBad(i)) {
                int sickCount = countPeopleWhoDrank(i);
                maxSick = Math.max(maxSick, sickCount);
            }
        }
        
        pw.println(maxSick);
        pw.close();
    }
    
    private static void initializeDrinkArrays(int d, BufferedReader br) throws IOException {
        personDrink = new int[d];
        milkDrink = new int[d];
        timeDrink = new int[d];
        for(int i = 0; i < d; i++) {
            StringTokenizer st = new StringTokenizer(br.readLine());
            personDrink[i] = Integer.parseInt(st.nextToken());
            milkDrink[i] = Integer.parseInt(st.nextToken());
            timeDrink[i] = Integer.parseInt(st.nextToken());
        }
    }
    
    private static void initializeSickArrays(int s, BufferedReader br) throws IOException {
        personSick = new int[s];
        timeSick = new int[s];
        for(int i = 0; i < s; i++) {
            StringTokenizer st = new StringTokenizer(br.readLine());
            personSick[i] = Integer.parseInt(st.nextToken());
            timeSick[i] = Integer.parseInt(st.nextToken());
        }
    }

    private static boolean isMilkBad(int milkType) {
        for(int i = 0; i < personSick.length; i++) {
            if(!didPersonDrinkBefore(personSick[i], milkType, timeSick[i])) {
                return false;
            }
        }
        return true;
    }

    private static boolean didPersonDrinkBefore(int person, int milkType, int time) {
        for(int i = 0; i < personDrink.length; i++) {
            if(personDrink[i] == person && milkDrink[i] == milkType && timeDrink[i] < time) {
                return true;
            }
        }
        return false;
    }

    private static int countPeopleWhoDrank(int milkType) {
        boolean[] didDrink = new boolean[51];
        for(int i = 0; i < personDrink.length; i++) {
            if(milkDrink[i] == milkType) {
                didDrink[personDrink[i]] = true;
            }
        }
        int drinkCount = 0;
        for(boolean drank : didDrink) {
            if(drank) {
                drinkCount++;
            }
        }
        return drinkCount;
    }
}

</pre>