1145. Hashing - Average Search Time (25)

1145. Hashing - Average Search Time (25)

#include 
using namespace std;
vector<int> v;
int tsize,n,m;
bool isprime(int n)
{
    if(n<2) return 0;
    for(int i=2;i*i<=n;++i){
        if(n%i==0) return 0;
    }
    return 1;
}
int getAddress(int val)
{
    return val%tsize;
}
void insert(int val)
{
    int i=0;
    while(iint address=getAddress(val+i*i);
        if(v[address]==0){
            v[address]=val;
            return;
        }
        ++i;
    }
    printf("%d cannot be inserted.\n",val);
}
int search(int val)
{
    int i=0,cnt=0;
    while(iint address=getAddress(val+i*i);
        if(v[address]==val||v[address]==0) return cnt;
        ++i;
    }
    return cnt+1;
}
int main()
{
    scanf("%d %d %d",&tsize,&n,&m);
    while(!isprime(tsize)) ++tsize;
    v=vector<int>(tsize);
    for(int i=0;iint val;
        scanf("%d",&val);
        insert(val);
    }
    double sum=0.0;
    for(int i=0;iint val;
        scanf("%d",&val);
        sum+=search(val);
    }
    printf("%.1lf\n",sum/m);
    return 0;
}