(UVA) Wedding Shopping - Solution

Link to the problem: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem&problem=2445

The solution below used Dynamic Programming to solve this problem.


import java.io.*;
import java.util.*;

class Main {
    public ArrayList<ArrayList<Integer>> garments;
    public int[][] matrix;
    public int maxMoney;
    public int totalMoney;
    public int numGarments;
   
    public void rec(int garment, int necessaryMoney) {
        if (necessaryMoney > maxMoney) {
            return;
        }
       
        if (garment == numGarments) {
            totalMoney = Math.max(totalMoney, necessaryMoney);
            return;
        }
       
        if (matrix[garment][necessaryMoney] != 0) {
            return;
        }
        matrix[garment][necessaryMoney] = 1;
       
        for (int i = 0; i < garments.get(garment).size(); i++) {
            // go to the next garment considering the ith model of the current garment
            rec(garment+1, necessaryMoney+garments.get(garment).get(i));
        }
    }
   
    public void process() throws NumberFormatException, IOException {
        Scanner sc = new Scanner(System.in);
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
       
        int numTests = sc.nextInt();
        for (int i = 0; i < numTests; i++) {
            maxMoney = sc.nextInt();
            numGarments = sc.nextInt();
           
            garments = new ArrayList<>();
            for (int j = 0; j < numGarments; j++) {
                garments.add(new ArrayList<Integer>());
            }
           
            for (int j = 0; j < numGarments; j++) {
                int numModels = sc.nextInt();
                for (int k = 0; k < numModels; k++) {
                    garments.get(j).add(sc.nextInt());
                }
            }
           
            matrix = new int[numGarments][maxMoney+1];
           
            totalMoney = -1;
            rec(0, 0);
           
            String answer = (totalMoney == -1) ? "no solution\n" : (totalMoney+"\n");
            bw.write(answer);
        }       
                                              
        bw.flush();
        bw.close();
       
        return;
    }
   
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main m = new Main();
        m.process();
       
        System.exit(0);
    }
}