请问下列程序在删除节点时一定要用pt指针吗Status PolyDifferential(LinkedPoly &L){LinkedPoly p,q,pt;q=L;p=L->next;while(p!=L){if(p->data.exp==0){pt=p;p=p->next;q->next=p;free(pt);//为什么在删除这个结点时要先用pt指向它
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![请问下列程序在删除节点时一定要用pt指针吗Status PolyDifferential(LinkedPoly &L){LinkedPoly p,q,pt;q=L;p=L->next;while(p!=L){if(p->data.exp==0){pt=p;p=p->next;q->next=p;free(pt);//为什么在删除这个结点时要先用pt指向它](/uploads/image/z/14165632-64-2.jpg?t=%E8%AF%B7%E9%97%AE%E4%B8%8B%E5%88%97%E7%A8%8B%E5%BA%8F%E5%9C%A8%E5%88%A0%E9%99%A4%E8%8A%82%E7%82%B9%E6%97%B6%E4%B8%80%E5%AE%9A%E8%A6%81%E7%94%A8pt%E6%8C%87%E9%92%88%E5%90%97Status+PolyDifferential%28LinkedPoly+%26L%29%7BLinkedPoly+p%2Cq%2Cpt%3Bq%3DL%3Bp%3DL-%3Enext%3Bwhile%28p%21%3DL%29%7Bif%28p-%3Edata.exp%3D%3D0%29%7Bpt%3Dp%3Bp%3Dp-%3Enext%3Bq-%3Enext%3Dp%3Bfree%28pt%29%3B%2F%2F%E4%B8%BA%E4%BB%80%E4%B9%88%E5%9C%A8%E5%88%A0%E9%99%A4%E8%BF%99%E4%B8%AA%E7%BB%93%E7%82%B9%E6%97%B6%E8%A6%81%E5%85%88%E7%94%A8pt%E6%8C%87%E5%90%91%E5%AE%83)
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