#include#define MAXL 100 //数据表的最大长度 #define MAXI 20 //索引表的最大长度 typedef int KeyType; typedef char InfoType[10]; typedef struct { KeyType key; //KeyType为关键字的数据类型 InfoType data; //其他数据 } NodeType; typedef NodeType SeqList[MAXL]; //顺序表类型 typedef struct { KeyType key; //KeyType为关键字的类型 int link; //指向对应块的起始下标 } IdxType; typedef IdxType IDX[MAXI]; //索引表类型 int IdxSearch(IDX I,int m,SeqList R,int n,KeyType k) { int low=0,high=m-1,mid,i; int b=n/m; //b为每块的记录个数 while (low<=high) //在索引表中进行二分查找,找到的位置存放在low中 { mid=(low+high)/2; if (I[mid].key>=k) high=mid-1; else low=mid+1; } //应在索引表的high+1块中,再在线性表中进行顺序查找 i=I[high+1].link; while (i<=I[high+1].link+b-1 && R[i].key!=k) i++; if (i<=I[high+1].link+b-1) return i+1; else return 0; } int main() { int i,n=56,m=7,j; SeqList R; IDX I= {{22,0},{45,8},{98,16},{158,24},{243,32},{492,40},{856,48}}; KeyType a[]= {22 ,4 ,23 ,11 ,20 ,2 ,15 ,13 , 30 ,45 ,26 ,34 ,29 ,35 ,26 ,36 , 55 ,98 ,56 ,74 ,61 ,90 ,80 ,96 , 127,158,116,114,128,113,115,102, 184,211,243,188,187,218,195,210, 279,307,492,452,408,361,421,399, 856,523,704,703,697,535,534,739}; KeyType x=200; for (i=0; i
分块查找算法的验证。