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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	static int[] input = {1,2,3,4,5,-6,7,8,9,10,200,-1000,100,250,-720,1080,200,300,400,500,50,74};
  8.  
  9. 	public static void main(String[] args) {	
  10. 		int[] two = new int[input.length/2];
  11. 		int[] one = new int[input.length - two.length];
  12.  
  13. 		int totalSum = 0;
  14. 		for(int i=0;i<input.length;i++){
  15. 			totalSum += input[i];
  16. 			if(i<one.length)
  17. 				one[i] = input[i];
  18. 			else
  19. 				two[i-one.length] = input[i];
  20. 		}
  21.  
  22. 		float goal = totalSum / 2f; 
  23.  
  24. 		boolean swapped;
  25. 		do{
  26. 			swapped = false;
  27. 			for(int j=0;j<one.length;j++){
  28. 				int curSum = sum(one);
  29. 				float curBestDiff = Math.abs(goal - curSum);
  30. 				int curBestIndex = -1;
  31.  
  32. 				for(int i=0;i<two.length;i++){
  33. 					int testSum = curSum - one[j] + two[i];
  34. 					float diff = Math.abs(goal - testSum);
  35. 					if(diff < curBestDiff){
  36. 						curBestDiff = diff;
  37. 						curBestIndex = i;
  38. 					}
  39. 				}
  40.  
  41. 				if(curBestIndex >= 0){	
  42. 					swapped = true;
  43. 					System.out.println("swapping " + one[j] + " and " + two[curBestIndex]);
  44. 					int tmp = one[j];
  45. 					one[j] = two[curBestIndex];
  46. 					two[curBestIndex] = tmp;
  47. 				}
  48. 			}
  49. 		} while(swapped);
  50.  
  51. 		System.out.println(Arrays.toString(one));
  52. 		System.out.println(Arrays.toString(two));
  53. 		System.out.println("diff = " + Math.abs(sum(one) - sum(two)));
  54. 	}
  55.  
  56. 	static int sum(int[] list){
  57. 		int sum = 0;
  58. 		for(int i=0;i<list.length;i++)
  59. 			sum += list[i];
  60. 		return sum;
  61. 	}
  62. }
Success #stdin #stdout 0.07s 380224KB
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stdin
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Standard input is empty
stdout
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swapping 1 and 500
swapping 2 and 1
swapping 3 and 2
swapping 4 and 3
[500, 1, 2, 3, 5, -6, 7, 8, 9, 10, 200]
[-1000, 100, 250, -720, 1080, 200, 300, 400, 4, 50, 74]
diff = 1
https://ideone.com/5Epzig
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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