考虑输入 `50 50 50`。
by ud2_ @ 2021-09-26 21:38:59
这样还是不对
```cpp
#include<bits/stdc++.h>
using namespace std;
long long w[50][50][50];
long long dfs(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 dfs(20,20,20);
}
else if(w[a][b][c]!=-1)
{
return w[a][b][c];
}
else
{
if(a<b&&b<c)
{
w[a][b][c]=dfs(a,b,c-1)+dfs(a,b-1,c-1)-dfs(a,b-1,c);
}
else
{
w[a][b][c]=dfs(a-1,b,c)+dfs(a-1,b-1,c)+dfs(a-1,b,c-1)-dfs(a-1,b-1,c-1);
}
}
}
signed main()
{
memset(w,-1,sizeof(w));
long long a,b,c;
cin>>a>>b>>c;
do
{
dfs(a,b,c);
printf("w(%lld, %lld, %lld) = %lld\n",a,b,c,w[a][b][c]);
cin>>a>>b>>c;
}
while(a!=-1||b!=-1||c!=-1);
}
```
by Li_wenjie @ 2021-09-26 21:45:06
```plain
main.cpp: In function 'long long int dfs(long long int, long long int, long long int)':
main.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type]
30 | }
| ^
```
编译器说你忘 `return` 了。
by ud2_ @ 2021-09-26 21:48:36