Cod sursa(job #1613132)

Utilizator mihai2003LLL LLL mihai2003 Data 25 februarie 2016 10:58:20
Problema Sum Scor 100
Compilator c Status done
Runda Arhiva de probleme Marime 0.5 kb
#include <stdio.h>
#include <stdlib.h>
long long e[100000];
void calcul(int n){
    int p,j,i;
    p=1;
    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);
}
int main()
{
    freopen("sum.in","r",stdin);
    freopen("sum.out","w",stdout);
    int n,i,k;
    scanf("%d",&n);
    calcul(100000);
    for(i=0;i<n;i++){
        scanf("%d",&k);
        printf("%lld\n",e[k]*2*k);
    }
    return 0;
}