Cod sursa(job #2788215)

Utilizator BlaugranasEnal Gemaledin Blaugranas Data 25 octombrie 2021 12:04:33
Problema Sum Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.36 kb
#include<fstream>
using namespace std;
ifstream F("sum.in");
ofstream G("sum.out");
#define N 100001
int i,j,n,x,e[N];
int main()
{
    for(i=2;i<N;++i)
        e[i]=i;
    for(i=2;i<N;++i)
        if(e[i]==i)
            for(j=i;j<N;j+=i)
                e[j]=e[j]/i*(i-1);
    for(F>>n,i=1;i<=n;++i)
        F>>x,G<<1LL*e[x]*2*x<<'\n';
    return 0;
}