Cod sursa(job #1757439)
Utilizator | Data | 15 septembrie 2016 01:31:33 | |
---|---|---|---|
Problema | Sum | Scor | 40 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.42 kb |
#include <fstream>
using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
int n,v[200002],i,j;
void sum(int x)
{
for(i=1;i<=2*x;i++) v[i]=i;
for(i=2;i<=2*x;i++)
{
if(v[i])
if(x%i==0)
for(j=i;j<=2*x;j+=i) v[j]=0;
}
}
int main()
{
f>>n;
int x;
while(n--)
{f>>x;
sum(x);
int s=0;
for(i=1;i<2*x;i++) s+=v[i];
g<<s<<endl;
}
}