Cod sursa(job #2784395)

Utilizator CristiBota3Cristian Bota Avram CristiBota3 Data 16 octombrie 2021 13:27:48
Problema Sum Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.47 kb
#include <fstream>

using namespace std;
int v[100001];
int main()
{
    ifstream fin ("sum.in");
    ofstream fout ("sum.out");

    int n=100000,x,N;
    fin>>N;

    for(int i=1; i<=n; i++)
    {
        v[i]=i-1;
    }
    v[1]=1;
    for(int i=2; i<=n/2; i++)
    {
        for(int j=i+i; j<=n; j+=i)
        {
            v[j]-=v[i];
        }
    }
    while(N--)
    {
        fin>>x;
        fout<<v[x]*2LL*x<<'\n';
    }
    return 0;
}