背包问题递归java

 public boolean PackageProblem(int[] arr,int start,int targetLeft,int target)
     {
         if(arr.length==0)
         {
             System.out.println("no Answer");
             return false;
         }
         if(start==arr.length)
         {
             int[] tempArr=new int[arr.length-1];
             System.arraycopy(arr, 1, tempArr, 0, arr.length-1);

             return PackageProblem(tempArr, 0, target, target);
         }
         else if(arr[start]>targetLeft)
         {
             return PackageProblem(arr, start+1, targetLeft, target);
         }
         else if(arr[start]==targetLeft)
         {
             System.out.println("yes has answer");
             return true;
         }
         else{
             return PackageProblem(arr, start+1, targetLeft-arr[start], target);
         }

     }

int[] arr={11,10,8,7,5,3};
int target=21;

但是这个数组要是从大到小排好的？

int[] arr={11,8,7,5,3,10};就不行