private static int Partition(List <IComparable> list, int lo, int hi)
{
int i = lo;
int j = hi + 1;
IComparable v = list[lo];
while (true)
{
//向右扫描直到找到大于v的值
while (list[i++].Less(v))
{
if (i == hi)
{
break;
}
}
//向左扫描直到找到小于v的值
while (v.Less(list[--j]))
{
if (j == lo)
{
break;
}
}
//i与j相遇
if (i >= j)
{
break;
}
list.Exch(i, j);
}
list.Exch(lo, j);
return(j);
}