Cod sursa(job #1392963)

Utilizator andrei.arnautuAndi Arnautu andrei.arnautu Data 19 martie 2015 00:02:29
Problema Suma divizorilor Scor 50
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.91 kb
#include <cstdio>
#define MOD 9901
using namespace std;
FILE *fin=freopen("sumdiv.in","r",stdin);
FILE *fout=freopen("sumdiv.out","w",stdout);

inline int POW(int x, int y)
{
    int i, aux = x, ret = 1;
    for(i = 1; i <= y; i <<= 1)
    {
        if( i & y )
            ret = (1LL * ret * aux) % MOD;
        aux = (1LL * aux * aux) % MOD;
    }
    return ret;
}

int main()
{
    int a, b, sol = 1, cnt;
    scanf("%d%d", &a, &b);
    for(int i = 2; i * i <= a; i++)
        if( a % i == 0 )
        {
            cnt = 0;
            while( a % i == 0 )
            {
                ++cnt, a /= i;
            }
            cnt *= b;
            sol *= (POW(i, cnt + 1) - 1) * POW(i - 1, MOD - 2); sol %= MOD;
        }
    if( a > 1 )
    {
        cnt = b;
        sol = 1LL * sol * ((POW(a, cnt + 1) - 1) * POW(a - 1, MOD - 2)) % MOD;
    }
    printf("%d", sol);
    return 0;
}