p=h->next; q=h->prior;
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{p=p->next; q=q->prior; j++;} else j=0; } return(j);
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Void sort (elemtype r[],int n) {int k,i;
for(k=n-1;k>=1;k- -) if(r[k]>r[k+1])
{ r[n+1]=r[k];
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