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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	List<List<Integer>> sodaPacks(int[] packs, int n, int index) {
  11. 		List<List<Integer>> result = new ArrayList<>();
  12.  
  13. 	  // Base case: we have one way to make an empty list
  14. 	  if (n == 0) {
  15. 	  	result.add(new ArrayList<>());
  16. 	  	return result;
  17. 	  }
  18.  
  19. 	  // Recursive step: we solve a smaller problem
  20. 	  for (int i = index; i < packs.length; i++) {
  21. 	    if (n - packs[i] >= 0) {
  22. 	      List<List<Integer>> ways = sodaPacks(packs, n - packs[i], i);
  23. 	      for (List<Integer> way : ways) {
  24. 	        // Tack on our solution:
  25. 	        way.add(packs[i]);
  26. 	        result.add(way);
  27. 	      }
  28. 	    }
  29. 	  }
  30. 	  return result;
  31. 	}
  32.  
  33. 	public static void main (String[] args) throws java.lang.Exception
  34. 	{
  35. 		Scanner sc = new Scanner(System.in);
  36. 		int n = sc.nextInt();
  37. 		int[] a = new int[n];
  38. 		for (int i = 0; i < n; i++) {
  39. 			a[i] = sc.nextInt();
  40. 		}
  41. 		int sodas = sc.nextInt();
  42. 		Ideone solution = new Ideone();
  43. 		System.out.println(solution.sodaPacks(a, sodas, 0));
  44. 		sc.close();
  45. 	}
  46. }
Success #stdin #stdout 0.15s 321344KB
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stdin
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1 2 3 5
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stdout
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[[1, 1, 1, 1, 1], [2, 1, 1, 1], [3, 1, 1], [2, 2, 1], [3, 2], [5]]
https://ideone.com/LfrCVK
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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