数据结构C语言版之查找（折半选择快速等）

来源：互联网发布：地图数据可视化工具编辑：程序博客网时间：2024/05/29 10:25
//查找：#include<stdio.h>#include<time.h>#include<stdlib.h>typedef struct{int *elem;int length;}SStable;typedef struct SYlist{int num;int *Key;int *start;}SYlist;void CreatSearchlist(SStable &S){int i;printf("请输入表长:\n");scanf("%d",&S.length);S.elem=(int*)malloc((S.length)*sizeof(int));for(i=1;i<S.length;i++)S.elem[i]=rand()%89+10;}int Search(SStable S,int key){S.elem[0]=key;while(S.elem[S.length]!=key)S.length--;return S.length;}void ShowSStable(SStable S){int i;for(i=1;i<S.length;i++)printf("%5d",S.elem[i]);printf("\n");}void Sort(SStable &S){int i,j,temp;for(i=1;i<S.length-1;i++){for(j=1;j<S.length-i-1;j++){if(S.elem[j]>S.elem[j+1]){temp=S.elem[j];S.elem[j]=S.elem[j+1];S.elem[j+1]=temp;}}}ShowSStable(S);}int Zbsearch(SStable S,int e){int mid,high=S.length-1,low=1;while(low<=high){mid=(low+high)/2;if(S.elem[mid]==e)return mid;else if(S.elem[mid]<e)low=mid+1;elsehigh=mid-1;}return 0;}void CreatSylist(SYlist &sy,SStable &S){int i,n;printf("\n\n\n建立索引表：\n");printf("请输入数据个数:\n");scanf("%d",&n);S.length=n+1;S.elem=(int*)malloc((S.length)*sizeof(int));printf("请输入一组数（局部有序）:\n");for(i=1;i<S.length;i++)scanf("%d",&S.elem[i]);printf("请输入关键字个数:\n");scanf("%d",&sy.num);    sy.Key=(int*)malloc(sy.num*sizeof(int));sy.start=(int*)malloc(sy.num*sizeof(int));for(i=0;i<sy.num;i++){   printf("请输入第%d个关键字:\n",i+1);scanf("%d",&sy.Key[i]);printf("请输入该关键字的位置:\n");scanf("%d",&sy.start[i]);}}int Sysearch(SYlist sy,SStable S,int m){int i=0,j;while(m>sy.Key[i])i++;if(i>0 && i<sy.num-1){for(j=sy.start[i];j<sy.start[i+1];j++){if(S.elem[j]==m)return j;}}    if(i==0){for(j=1;j<sy.start[1];j++){if(S.elem[j]==m)return j;}}if(i>=sy.num-1){for(j=sy.start[sy.num];j<S.length;j++){if(S.elem[j]==m)return j;}}}int main(){SStable S;SYlist sy;int key,e,m;srand(time(0));CreatSearchlist(S);printf("随机产生的%d个两位数构造的查找表为:\n",S.length-1);ShowSStable(S);printf("\n请输入要查找的数:");scanf("%d",&key);if(Search(S,key))printf("查找成功!该数在表中的位置为：%d\n",Search(S,key));elseprintf("查找失败!\n");    printf("对表中数据按递增进行排序后的序列为:\n");Sort(S);printf("\n请输入要查找的数:");scanf("%d",&e);if(Zbsearch(S,e))printf("折半查找成功!该数在表中的位置为：%d\n",Zbsearch(S,e));elseprintf("查找失败!\n");CreatSylist(sy,S);printf("\n请输入要查找的数:");scanf("%d",&m);Sysearch(sy,S,m);    if(Sysearch(sy,S,m))printf("查找成功!该数在表中的位置为：%d\n",Sysearch(sy,S,m));elseprintf("查找失败!\n");return 0;}
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