luogu 1876 开灯 约数+打表

Code:

#include <cstdio> 
#include <algorithm>
using namespace std; 
int main() 
{
    long long n; 
    scanf("%lld",&n); 
    for(long long i=1;i*i<=n;++i) printf("%lld ",(long long)i*i); 
    return 0; 
}