~~弱弱问一句，啥是记忆化~~
by Lhy2021 @ 2023-01-06 14:28:53
@[Lhy2021](/user/632185) [记忆化搜索](https://oi-wiki.org/dp/memo/)
by qwerasdasd1 @ 2023-01-06 14:35:04
@[Lhy2021](/user/632185) 首先，加记忆化。
其次，注意空格。你的输出没加空格。
改完的代码，仅供参考，请勿直接复制：
```cpp
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<string>
#include<cstring>
#include<cstdlib>
#include<vector>
#include<stack>
#include<deque>
#include<map>
using namespace std;
long qwq[22][22][22】;
long w(long a,long b,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(qwq[a][b][c]) return qwq[a][b][c];
else if(a<b&&b<c) return qwq[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
else return qwq[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);
}
int main(）
{
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 114514；
}
```
by Hughpig @ 2023-01-06 14:46:24
@Hughpig太感谢了
by Lhy2021 @ 2023-01-06 14:52:51