```cpp
#include<iostream>
#include<cstdio>
using namespace std;
int sum;
void pingfan(int u,int l)
{
int s=1; for(int z=1;z<=l;z++) s*=u; return s;
}
int main()
{
int x,n; cin>>x>>n;
for(int i=1;i<=n;i++) {
sum=pingfan(x,i-1)+pingfan(x,i);
}
cout<<sum;
return 0;
}
```
by AC_Dolphin @ 2018-05-06 12:26:43
```cpp
#include<iostream>
#include<cstdio>
using namespace std;
int sum;
void pingfan(int u,int l)
{
int s=1;
for(int z=1;z<=l;z++) s*=u;
return s;
}
int main()
{
int x,n;
cin>>x>>n;
for(int i=1;i<=n;i++)
sum=pingfan(x,i-1)+pingfan(x,i);
cout<<sum;
return 0;
}
```
这题不用用函数吧。。。数据不大直接用for循环乘就行了
by AC_Dolphin @ 2018-05-06 12:30:13