HDU 1164 Eddy's research I【素数筛选法】

思路：将输入的这个数分成n个素数的相乘的结果，用一个数组存储起来。之后再输出就能够了

Eddy's research I

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)

Total Submission(s): 6633    Accepted Submission(s): 3971

Problem Description

Eddy's interest is very extensive, recently he is interested in prime number. Eddy discover the all number owned can be divided into the multiply of prime number, but he can't write program, so Eddy has to ask intelligent you to help him, he asks you to write
a program which can do the number to divided into the multiply of prime number factor .

Input

The input will contain a number 1 < x<= 65535 per line representing the number of elements of the set.

Output

You have to print a line in the output for each entry with the answer to the previous question.

Sample Input

11
9412

Sample Output

11
2*2*13*181

Author

eddy

#include<stdio.h>
#include<string.h>
int a[55];
int getprime(int x)
{
    memset(a,0,sizeof(a));
    int i,cnt=0;
    for(i=2; i<=x; i++)
    {
        while(x%i==0)
        {
            a[cnt++]=i;
            x=x/i;
        }
    }
    return cnt;
}
int main()
{
    int n;
    while(~scanf("%d",&n))
    {
        int k,i;
        k=getprime(n);
        for(i=0; i<k-1; i++)
            printf("%d*",a[i]);
        printf("%d\n",a[k-1]);

    }
    return 0;
}