Cod sursa(job #2309951)
Utilizator | Data | 30 decembrie 2018 12:16:37 | |
---|---|---|---|
Problema | Sum | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.46 kb |
#include <bits/stdc++.h>
using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
int E[100005];
void euler(int N=100000)
{
for(int i=2;i<=N;i++) E[i]=i;
for(int i=2;i<=N;i++)
{
if(E[i]==i)
for(int j=i;j<=N;j+=i)
E[j]=E[j]/i*(i-1);
}
}
int main()
{
euler();
int N; f>>N;
for(int i=1,x;i<=N;i++)
{
f>>x;
g<<2LL*x*E[x]<<'\n';
}
return 0;
}