Cod sursa(job #1886431)
| Utilizator | Data | 20 februarie 2017 21:25:47 | |
|---|---|---|---|
| Problema | Sum | Scor | 100 |
| Compilator | cpp | Status | done |
| Runda | Arhiva de probleme | Marime | 0.55 kb |
#include <iostream>
#include <fstream>
#include <cstdio>
using namespace std;
ifstream fin("sum.in");
int ind[100100];
int n,x,ans,j,i;
int main()
{
fin>>n;
for(i=1; i<=100000; ++i)
ind[i]=i;
for(j=2; j<=100000; j+=2)
ind[j]=ind[j]/2;
for(i=3; i<=100000; i+=2)
if(ind[i]==i)
{
for(j=i; j<=100000; j+=i)
ind[j]=ind[j]/i*(i-1);
}
freopen("sum.out","w",stdout);
while(n--)
{
fin>>x;
printf("%lld\n",1LL*x*ind[x]*2);
}
}
