Cod sursa(job #3137186)
Utilizator | Maria Ciutea maryy | Data | 11 iunie 2023 16:20:11 |
---|---|---|---|
Problema | Sum | Scor | 70 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.58 kb |
#include <fstream>
using namespace std;
ifstream in("sum.in");
ofstream out("sum.out");
int ind[200001];
int main()
{
int n, x;
in>>n;
for(int i=1; i<=200000; i++)
{
ind[i]=i;
}
for(int i=2; i<=200000; i=i+2)
{
ind[i]=ind[i]/2;
}
for(int i=3; i<=200000; i++)
{
if(ind[i]==i)
{
for(int j=i; j<=200000; j=j+i)
{
ind[j]=ind[j]/i*(i-1);
}
}
}
for(int i=1; i<=n; i++)
{
in>>x;
out<<ind[x]*2*x<<'\n';
}
}