public static int solution(int[] A)
{
CountingSort_Integer.Sort(A, -1000000, 1000000);
A = CountingSort_Integer.NewArray;
int small = 1;
for (int i = 0; i < A.Length; i++)
{
if (A[i] == small)
{
++small;
}
}
return(small);
}
public void Sort()
{
CountingSort_Integer.Sort(IntegerArray, -1000000, 1000000);
IntegerArray = CountingSort_Integer.NewArray;
}