```cpp
// luogu-judger-enable-o2
#include <bits/stdc++.h>
using namespace std;
int n,m,ans;
void cmp(int a,int b){
if(a==n&&b==m)ans++;
if(a>n||b>m||a<0)return ;
cmp(a+2,b+1);
cmp(a+1,b+2);
cmp(a-1,b+2);
cmp(a-2,b+1);
}
int main(){
cin>>n>>m;
cmp(0,0);
cout<<ans;
return 0;
}
```
@[12345679a](/space/show?uid=85933) 代码给你
by Kiel @ 2018-04-11 21:25:16
@[something](/space/show?uid=84025) O2？？一定要？？
by ⚡GG⚡ @ 2018-04-13 21:14:05