1.请编程实现哈希表的创建存储数组{12,24,234,234,23,234,23},输入key查找的值,实现查找功能。
源代码:
#include
#include
#include
#include
typedef struct Node
{
int data;
struct node *next;
}*list;
int max_prime(int m)
{
int i=m;
for(i;i>1;i--)
{
int flag=0;
for(int j=2;j<=sqrt(i);j++)
{
if(i%j==0)
{
flag=-1;
break;
}
}
if(flag==0)
return i;
}
}
list create_node()
{
list s=(list)malloc(sizeof(struct Node));
if(NULL==s)
return NULL;
s->data=0;
s->next=NULL;
return s;
}
void insert_hash(int arr,int p,list hash[])
{
int value=arr%p;
list s=create_node();
s->data=arr;
if(NULL==hash[value])
{
hash[value]=s;
}
else
{
s->next=hash[value];
hash[value]=s;
}
}
void output_hash(list hash[],int m)
{
for(int i=0;idata);
p=p->next;
}
puts("end");
}
}
int search_hash(list hash[],int p,int key)
{
int value=key%p;
list head=hash[value];
while(head)
{
if(head->data==key)
return 0;
head=head->next;
}
return -1;
}
int main(int argc, const char *argv[])
{
int arr[]={12,24,234,234,23,234,23};
int len=sizeof(arr)/sizeof(arr[0]);
int m=len*4/3;//哈希表长
list hash[m];
for(int i=0;i
效果显示:
2.现有数组{12,23,45,56,445,5676,6888},请输入key实现二分查找。
源代码:
#include
#include
#include
int half(int key,int arr[],int low,int high)
{
while(low<=high)//存在元素
{
int mid=(low+high)/2;
if(arr[mid]key)
{
high=mid-1;
}
else
{
return mid;
}
}
return -1;
}
int main(int argc, const char *argv[])
{
int arr[]={12,23,45,56,445,5676,6888};
int key;
int len=sizeof(arr)/sizeof(arr[0]);
printf("please enter key:");
scanf("%d",&key);
int index=half(key,arr,0,len-1);
if(index==-1)
puts("unexists");
else
printf("exists in %d\n",index);
return 0;
}
效果显示: