Cod sursa(job #1434483)
| Utilizator | Data | 10 mai 2015 18:14:46 | |
|---|---|---|---|
| Problema | Sum | Scor | 90 |
| Compilator | cpp | Status | done |
| Runda | Arhiva de probleme | Marime | 0.39 kb |
#include<fstream>
#include<algorithm>
using namespace std;
int i,j,t,x,phi[100005];
int main()
{
ifstream cin("sum.in");
ofstream cout("sum.out");
ios_base::sync_with_stdio(0);
for(i=1;i<=(int)1e5;++i) phi[i]=i;
for(i=2;i<=(int)1e5;++i)
if(phi[i]==i) for(j=i;j<=(int)1e5;j+=i) phi[j]-=phi[j]/i;
for(cin>>t;t;--t) cin>>x,cout<<2LL*x*phi[x]<<'\n';
return 0;
}
