Cod sursa(job #3273019)

Utilizator marap2011Paun Mara marap2011 Data 1 februarie 2025 09:04:55
Problema Fractii Scor 0
Compilator cpp-64 Status done
Runda cex_8 Marime 0.55 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin ("fractii.in") ;
ofstream fout ("fractii.out") ;
long long n , i , j , a[1000001] ;
long long sum , nr = 1 ;
int main()
{
    fin >> n ;
    for ( i = 2 ; i <= n ; i ++ )
    {
        if ( a[i] == 0 )
        {
            for ( int j = i ; j <= n ; j += i )
                a[j] += j / i - 1 ;
        }
        a[i] ++ ;
    }
    for ( i = 2 ; i <= n ; i ++ )
        sum += 2 * a[i] - 1  ;
    nr = n * n ;
    cout << nr << " " << sum ;
    fout << nr - sum ;

    return 0;
}