typedef struct
{  int key;
   int link;
}SD;
typedef struct
{  int key;
   float info;
}JD;

int blocksrch(JD r[],SD nd[],int b,int k,int n)
{  int i=1,j;
   while((k>nd[i].key)&&(i<=b)  i++;
   if(i>b) {  printf("\nNot found");
              return(0);
           }
   j=nd[i].link;
   while((j<n)&&(k!=r[j].key)&&(r[j].key<=nd[i].key))
      j++;
   if(k!=r[j].key) { j=0; printf("\nNot found"); }
   return(j);
}