Largest prime factor
Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5021 Accepted Submission(s): 1772
Problem Description
Everybody knows any number can be combined by the prime number.
Now, your task is telling me what position of the largest prime factor.
The position of prime 2 is 1, prime 3 is 2, and prime 5 is 3, etc.
Specially, LPF(1) = 0.
Now, your task is telling me what position of the largest prime factor.
The position of prime 2 is 1, prime 3 is 2, and prime 5 is 3, etc.
Specially, LPF(1) = 0.
Input
Each line will contain one integer n(0 < n < 1000000).
Output
Output the LPF(n).
Sample Input
12345
Sample Output
01213
Author
Wiskey
Source
#include <cstdio>
#define N 1000001
int x[N]={0};
int main()
{
int i,j,n;
n=0;
for(i=2;i<N;i++)
while(x==0)
{
n++;
for(j=i;j<N;j+=i)
x[j]=n;
}
while(scanf("%d",&n)!=EOF)
printf("%d\n",x[n]);
return 0;
}