```
#include<iostream>
#include<cstdio>
using namespace std;
int n;
inline bool sushu(int x)
{
if (x==2)
return 1;
if (x%2==0)
return 0;
for (int i=3;i*i<=x;i=i+2)
if (x%i==0)
return 0;
return 1;
}
int main()
{
scanf("%d",&n);
for (int i=2;i<=n;i++)
{
if (sushu(i))
for (int j=i;j<=n;j++)
{
if (sushu(j)&&sushu(n-j-i))
{
printf("%d %d %d",i,j,n-j-i);
return 0;
}
}
}
return 0;
}
```
事实证明我的程序并不超时……
by 准点的星辰 @ 2018-06-02 07:48:01