@[13833925596mm](/user/486441)
```cpp
#include <bits/stdc++.h>
using namespace std;
long long k[21][21][21]={0};
long long f(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 f(20,20,20);
else if(k[a][b][c]!=0) return k[a][b][c];
else if(a<b && b<c){
k[a][b][c]=f(a,b,c-1)-f(a,b-1,c)+f(a,b-1,c-1);
return k[a][b][c];
}
else k[a][b][c]=f(a-1,b,c)-f(a-1,b-1,c-1)+f(a-1,b-1,c)+f(a-1,b,c-1);
return k[a][b][c];
}
int main(){
long long a,b,c;
cin>>a>>b>>c;
while(a!=-1 || b!=-1 || c!=-1){
memset(k,0,sizeof(k));
cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<<f(a,b,c)<<endl;
cin>>a>>b>>c;
}
return 0;
}
```
自行找不同
by _Andy_Lin_ @ 2022-07-15 16:22:11
@[Andy_Lin](/user/261370)
谢谢！
by 13833925596mm @ 2022-07-15 16:33:40