Cod sursa(job #1392994)

Utilizator andrei.arnautuAndi Arnautu andrei.arnautu Data 19 martie 2015 00:27:31
Problema Suma divizorilor Scor 60
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.09 kb
#include <cstdio>
#define MOD 9901
using namespace std;
FILE *fin=freopen("sumdiv.in","r",stdin);
FILE *fout=freopen("sumdiv.out","w",stdout);

inline long long int POW(long long int x,long long int y)
{
    long long 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;
}

inline long long int verif(long long int x)
{
    if( x < 0 )
        x += MOD;
    return x;
}

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