Cod sursa(job #1207596)

Utilizator assa98Andrei Stanciu assa98 Data 13 iulie 2014 14:27:49
Problema Sum Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.64 kb
#include <cstdio>
#include <algorithm>
using namespace std;

const int MAX_N = 100000;

long long c[MAX_N+10];

int main() {
    freopen("sum.in", "r", stdin);
    freopen("sum.out", "w", stdout);
    for(int i = 2; i <= MAX_N; i++) {
        c[i] = i;
    }

    for(int i = 2; i <= MAX_N; i++) {
        if(c[i] == i) {
            for(int j = i; j <= MAX_N; j += i) {
                c[j] *= i - 1;
                c[j] /= i;
            }
        }
    }
    
    int n;
    scanf("%d", &n);
    for(int i = 1; i <= n; i++) {
        long long x;
        scanf("%lld", &x);
        printf("%lld\n", (long long)c[x] * 2 * x);
    }
    return 0;
}