Cod sursa(job #2136081)
Utilizator | VasileOctavian OctavianVasile | Data | 19 februarie 2018 17:01:21 |
---|---|---|---|
Problema | Sum | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.49 kb |
#include <fstream>
using namespace std;
int phi [ 100003 ] ;
ifstream cin ( "sum.in" ) ;
ofstream cout ( "sum.out" ) ;
int main()
{
for ( int i = 1 ; i <= 100002 ; i ++ )
phi [ i ] = i - 1 ;
for(int i = 2 ; i < 100002 ; i ++ )
for(int j = i * 2 ; j < 100002 ; j += i )
phi [ j ] -= phi [ i ] ;
int n ;
cin >> n ;
while( n -- )
{
int a ;
cin >> a ;
cout << 1LL * 2 * a * phi [ a ] << '\n' ;
}
}