@[CoCo_Candy](/user/337878)
我太弱了[哭]
by HC_Lin @ 2022-08-27 17:00:40
@[HC_Lin](/user/730477) 你忘了return 0了吧
by gmy_coding @ 2022-10-12 21:02:45
`你空间复杂度爆了!`
```cpp
#include <bits/stdc++.h>
using namespace std;
long long f[25][25][25];
long long w(long long a,long long b,long long c)
{
if(a<=0||b<=0||c<=0) return 1;
else if(a>20||b>20||c>20) return w(20,20,20);
else if(f[a][b][c]!=0) return f[a][b][c];
else if(a<b&&b<c) f[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
else f[a][b][c]=w(a-1,b,c)+w(a-1,b-1,c)+w(a-1,b,c-1)-w(a-1,b-1,c-1);
return f[a][b][c];
}
int main()
{
long long a,b,c;
while(cin>>a>>b>>c)
{
if(a==-1&&b==-1&&c==-1) break;
cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<<w(a,b,c)<<endl;
}
return 0;
}
```
by int_stl @ 2022-11-16 14:38:19