Cod sursa(job #2102257)
Utilizator | Data | 8 ianuarie 2018 16:34:11 | |
---|---|---|---|
Problema | Sum | Scor | 95 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.49 kb |
#include <fstream>
using namespace std;
ifstream in("sum.in");
ofstream out("sum.out");
int phi[100002];
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;
in>>n;
while(n--)
{
int valuare;
in>>valuare;
out<<1LL*2*valuare*phi[valuare]<<'\n';
}
return 0;
}