Cod sursa(job #1205735)
Utilizator | Pavlov Ion pavlov.ion | Data | 7 iulie 2014 22:40:12 |
---|---|---|---|
Problema | Sum | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.41 kb |
#include<fstream>
using namespace std;
ifstream cin("sum.in");
ofstream cout("suma.out");
int N,X,phi[100000];
int main() {
int i,j,k;
for(i=1;i<=100000;i++)
phi[i]=i-1;
for(i=2;i<=100000;i++)
for(j=2*i;j<=100000;j+=i)
phi[j]-=phi[i];
cin>>N;
for(i=1;i<=N;i++){
cin>>X;
cout<<2*phi[X]*X;
}
return 0;
}