```
#include<bits/stdc++.h>
using namespace std;
long long w[100][100][100];
long long s(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 s(20,20,20);
}
if(w[a][b][c]!=0)return w[a][b][c];
else if(a<b&&b<c)
{
w[a][b][c]=s(a,b,c-1)+s(a,b-1,c-1)-s(a,b-1,c);
return w[a][b][c];
}
else
{
w[a][b][c]=s(a-1,b,c)+s(a-1,b-1,c)+s(a-1,b,c-1)-s(a-1,b-1,c-1);
return w[a][b][c];
}
}
int main()
{
memset(w,0,sizeof(w));
for(int i=1;;i++)
{
long long a,b,c;
cin>>a>>b>>c;
if(a==-1&&b==-1&&c==-1)return 0;
printf("w(%lld, %lld, %lld) = %lld\n",a,b,c,s(a,b,c));
}
return 0;
}
```
by _liujunming_ @ 2024-07-25 14:49:47