```cpp
#include <bits/stdc++.h>
using namespace std;
int p[31][31];
int main()
{
int n,m;//n,mans,m,rounds
cin>>n>>m;
p[0][1]=1;
for (int i=1;i<=m;i++)
{
for (int j=1;j<=n;j++)
{
if (j==1) p[i][j]=p[i-1][n]+p[i-1][2];
else if (j==n) p[i][j]=p[i-1][n-1]+p[i-1][1];
else p[i][j]=p[i-1][j-1]+p[i-1][j+1];
}
}
cout<<p[m][1];
return 0;
}
```
by 几何之舞丶 @ 2020-02-26 21:07:45
过了.自己看吧.
by 几何之舞丶 @ 2020-02-26 21:07:56