递推与递归2:约数之和
作者:
总打瞌睡的天天啊
,
2024-08-04 10:55:52
,
所有人可见
,
阅读 2
#include<iostream>
using namespace std;
const int mod=9901;
int qmi(int a,int k)
{
int res=1;
a%=mod;
while(k)
{
if(k&1)res=res*a%mod;
a=a*a%mod;
k>>=1;
}
return res;
}
int sum(int p,int k)
{
if(k==1)return 1;
if(k%2==0)return (1+qmi(p,k/2))*sum(p,k/2)%mod;
return ((sum(p,k-1))+qmi(p,k-1))%mod;
}
int main()
{
int a,b;
cin>>a>>b;
int res=1;
for(int i=2;i*i<=a;i++)
if(a%i==0)
{
int s=0;
while(a%i==0)
{
s++;
a/=i;
}
res=res*sum(i,b*s+1)%mod;
}
if(a>1)res=res*sum(a,b+1)%mod;
if(a==0)res=0;
cout<<res<<endl;
}