Cod sursa(job #1617378)
Utilizator | Jianu Mihail mihail.jianu | Data | 27 februarie 2016 13:12:49 |
---|---|---|---|
Problema | Sum | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.41 kb |
#include<cstdio>
const int N=100000;
int e[N+1];
int main(){
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
for(int i=1;i<=N;i++)
e[i]=i-1;
for(int i=2;i<=N;i++)
for(int j=i*2;j<=N;j+=i)
e[j]-=e[i];
int t;
scanf("%d",&t);
while(t--){
int n;
scanf("%d",&n);
printf("%lld\n",1LL*2*n*e[n]);
}
return 0;
}