Cod sursa(job #1617379)
Utilizator | Data | 27 februarie 2016 13:14:06 | |
---|---|---|---|
Problema | Sum | Scor | 5 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.49 kb |
#include<cstdio>
using namespace std;
int v[100001],n,t;
int main(){
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
for(int i=1;i<=100000;i++)
v[i]=i-1;
for(int i=2;i<=100000;i++)
if(v[i]==i-1){
for(int j=2*i;j<=100000;j+=i)
v[j]-=v[i];
}
scanf("%d",&t);
for(int i=1;i<=t;i++){
scanf("%d",&n);
long long rez=2*n*v[n];
printf("%d\n",rez);
}
return 0;
}