这段链表的快速排序的代码哪里出了问题，vs2010上调试不过

Question

void myquicksort( node *phead, node *pback )
{

if( phead == pback )
{
return;
}
else
{
int key = phead->data ;
node *p1 = NULL;
for( node *p2 = phead->pNext; p2 != pback; p2 = p2->pNext )
{
if( p2->data < key )
{
p1 = p1->pNext;
int temp;
temp = p1->data;
p1->data = p2->data;
p2->data = temp;
}
}
int temp;
temp = p1->data;
p1->data = phead->data;
phead->data = temp;

        myquicksort( phead, p1 );
        myquicksort( p1->pNext, pback );

}
}

Answer 1

p1空指针，没指向就使用了。