Cod sursa(job #2285457)

Utilizator Tibi55Ionescu Tiberiu Tibi55 Data 18 noiembrie 2018 16:49:04
Problema Suma divizorilor Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 1 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("sumdiv.in");
ofstream g("sumdiv.out");
const int mod = 9901;
long long s = 1;
int pow(long long a, int p)
{
    long long x = 1;
    while(p > 0)
        if(p % 2 == 0)
        {
            p /= 2;
            a = a * a % mod;
        }
        else
        {
            x=x*a%mod;
            p--;
        }
    return x;
}
void add(int x, int n)
{
    if(x == 0)
        return;
    if(x == 1)
        s = s * (n + 1) % mod;
    else
    {
        s = s * (pow(x, n + 1) + mod - 1) % mod * pow(x - 1, mod - 2) % mod;
    }
}
int main()
{
    int a, b;
    f >> a >> b;
    for(int i = 2; i * i <= a; i++)
        if(a % i == 0)
        {
            int p = 0;
            do
            {
                p++;
                a /= i;
            }
            while(a % i == 0);
            add(i % mod, b * p);
        }
    if(a > 1)
        add(a % mod, b);
    g<<s;
    return 0;
}