@[Harry_Haiyun](/user/977778) 都define了怎么不用ull？
by 2011FYCCCTA @ 2023-08-08 15:33:27
还有要记忆化
by 2011FYCCCTA @ 2023-08-08 15:34:24
不行，全TLE
by __Harry_Haiyun__ @ 2023-08-08 19:13:21
@[__Harry_Haiyun__](/user/977778) 这么写就对
```cpp
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int ans[25][25][25];
long long w(long long a,long long b,long long c)
{
if(a<=0||b<=0||c<=0)
return 1;
if(a>20||b>20||c>20)
a=b=c=21;
if(ans[a][b][c])
return ans[a][b][c];
if(a>20||b>20||c>20)
return ans[a][b][c]=w(20,20,20);
if(a<b&&b<c)
return ans[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
return ans[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()
{
while(1)
{
long long x,y,z;
cin>>x>>y>>z;
if(x==-1&&y==-1&&z==-1)break;
printf("w(%lld, %lld, %lld) = %d\n",x,y,z,w(x,y,z));
}
return 0;
}
```
by Li_wc0802 @ 2023-08-18 08:06:45