Cod sursa(job #2797702)

Utilizator BlaugranasEnal Gemaledin Blaugranas Data 10 noiembrie 2021 14:21:06
Problema Sum Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.32 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
ifstream F("sum.in");
ofstream G("sum.out");
#define N 100001
int i,j,e[N];
int main()
{
    for(i=2;i<N;++i)
        e[i]=i-1;
    for(i=2;i<N;++i)
        for(j=2*i;j<N;j+=i)
            e[j]-=e[i];
    for(F>>i;i;--i)
        F>>j,G<<1LL*e[j]*2*j<<'\n';
    return 0;
}