1、第9行，```w(a,b-1,c-1)```和```w(a,b-1,c)```之间是```-```号连接；
2、第20行，输出格式不对，注意要加空格。
by IRIDESCENTqwq @ 2023-04-29 09:26:07
while循环的判断换成cin>>a>>b>>c会不会更好一点（雾）
by bj12z_liuzhengyue @ 2023-04-29 19:52:58
@[YiLino](/user/597004) 谢谢大佬，成功AC了
by bj12z_JiaTangchen @ 2023-04-30 09:24:47
@[bj12z_liuzhengyue](/user/757522) 好像可以，放里面之后AC了，谢谢大佬！
by bj12z_JiaTangchen @ 2023-04-30 09:26:00
```cpp
#include <bits/stdc++.h>
using namespace std;
int f[21][21][21];
int w(long long a,long long b,long long c){
if(a<=0||b<=0||c<=0) return 1;
if(a>20||b>20||c>20) return w(20,20,20);
int k;
if(f[a][b][c]) return f[a][b][c];
if(a<b&&b<c) k=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
else k=w(a-1,b,c)+w(a-1,b-1,c)+w(a-1,b,c-1)-w(a-1,b-1,c-1);
f[a][b][c]=k;
return k;
}
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 << ") = " ;
cout<<w(a,b,c)<<endl;
}
return 0;
}
```
by bj12z_JiaTangchen @ 2023-04-30 09:26:44