```
#include<iostream>
using namespace std;
long long a,b,c;
long long x[50][50][50]={0};
long long w(long long d,long long e,long long f)
{
if(d<=0||e<=0||f<=0) return 1;
if(d>20||e>20||f>20) return w(20,20,20);
if(x[d][e][f]!=0)return x[d][e][f];
if(d<e&&e<f) {
x[d][e][f]= w(d,e,f-1)+w(d,e-1,f-1)-w(d,e-1,f);
return x[d][e][f];
}
x[d][e][f]= w(d-1,e,f)+w(d-1,e-1,f)+w(d-1,e,f-1)-w(d-1,e-1,f-1);
return x[d][e][f];
}
int main ()
{
while(a!=-1||b!=-1||c!=-1)
{
cin>>a>>b>>c;
if(a!=-1||b!=-1||c!=-1)
cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<<w(a,b,c)<<endl;
}
return 0;
}
```
by lndjy @ 2020-01-04 10:05:04
@[zxy1703](/user/305553) 自己看吧，我太菜不帮你改了
by lndjy @ 2020-01-04 10:06:59
@[水题淹死的鱼](/user/196899) orz跪谢神犇
by zxy1703 @ 2020-01-04 10:44:48
@[zxy1703](/user/305553) 我明明是蒟蒻qwq
by lndjy @ 2020-01-04 15:47:25