```cpp
#include <bits/stdc++.h>
#define int long long
using namespace std;
int n[130][130][130];
int dg(int a, int b, int c) {
if (a <= 0 || b <= 0 || c <= 0)
return 1;
else if (n[a][b][c] != 0)
return n[a][b][c];
else if (a > 20 || b > 20 || c > 20)
n[a][b][c] = dg(20, 20, 20);
else if (a < b && b < c)
n[a][b][c] = dg(a, b, c - 1) + dg(a, b - 1, c - 1) + dg(a, b - 1, c);
else return dg(a - 1, b, c) + dg(a - 1, b - 1, c) + dg(a - 1, b, c - 1) - dg(a - 1, b - 1, c - 1);
return n[a][b][c];
}
signed main() {
int a, b, c;
while (cin >> a >> b >> c) {
if (a == b && b == c && c == -1)
break;
int p = 0;
cout << "w(" << a << ", " << b << ", " << c << ") = ";
if (a > 20)
a = 21;
if (b > 20)
b = 21;
if (c > 20)
c = 21;
p = dg(a, b, c);
cout << p << endl;
}
return 0;
}
```
by Pitiless_boy @ 2023-12-30 13:51:00
@[Pitiless_boy](/user/1011137)
谢，没开long long
[记录](https://www.luogu.com.cn/record/141411594)
by hanciyang @ 2023-12-30 13:56:29
@[hanciyang](/user/927003) ok
by Pitiless_boy @ 2023-12-30 13:57:03