```

```
#include<bits/stdc++.h>
#pragma GCC optimize(2)
using namespace std;
int a,b,c,f[100000];
int ans[25][25][25];
void dfs(int A,int B,int C)
{
	if(ans[A][B][C]==1) return ;
	else ans[A][B][C]=1;
    if(A==0&&f[C]==0){
        f[C]=1;
    }
    if(A<a&&C>0)dfs(min(a,A+C),B,max(0,C-a+A));
    if(B<b&&C>0)dfs(A,min(b,B+C),max(0,C-b+B));
    if(A<a&&B>0)dfs(min(a,A+B),max(0,B-a+A),C);
    if(C<c&&B>0)dfs(A,max(0,B-c+C),min(c,C+B));
    if(B<b&&A>0)dfs(max(0,A+B-b),min(b,B+A),C);
    if(C<c&&A>0)dfs(max(0,A+C-c),B,min(c,C+A));
}
int main()
{
    cin>>a>>b>>c;
    dfs(0,0,c);
    for(int i=0;i<=c;i++) if(f[i]==1) cout<<i<<" ";
    return 0;
}
```
```

简单dfs

#include<bits/stdc++.h>
using namespace std;
int a,b,c,ans[10001],ans1;
bool t[61][61][61];
void dfs(int x,int y,int z)
{
	if(t[x][y][z])return;
	if(x==0)ans[++ans1]=z;
	t[x][y][z]=1;
	if(z<=a-x)dfs(x+z,y,0);
	else dfs(a,y,z-a+x);
	//z->x
	if(z<=b-y)dfs(x,y+z,0);
	else dfs(x,b,z-b+y);
	//z->y
	if(y<=a-x)dfs(x+y,0,z);
	else dfs(a,y-a+x,z);
	//y->x
	if(y<=c-z)dfs(x,0,z+y);
	else dfs(x,y-c+z,c);
	//y->z
	if(x<=b-y)dfs(0,y+x,z);
	else dfs(x-b+y,b,z);
	//x->y
	if(x<=c-z)dfs(0,y,z+x);
	else dfs(x-c+z,y,z);
	//x->z
}
int main()
{
	cin>>a>>b>>c;
	dfs(0,0,c);
	sort(ans+1,ans+ans1+1);
	for(int i=1;i<=ans1;i++)
	cout<<ans[i]<<" ";
}

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll A,B,C,f[50][50][50],h[50];
void dfs(ll a,ll b,ll c)
{
	if(f[a][b][c]==0){
		f[a][b][c]=1;
		if(a==0) h[c]=1;
		if(a<B-b) dfs(0,b+a,c); else dfs(a-(B-b),B,c);
		if(a<C-c) dfs(0,b,c+a); else dfs(a-(C-c),b,C);
		if(b<A-a) dfs(a+b,0,c); else dfs(A,b-(A-a),c);
		if(b<C-c) dfs(a,0,c+b); else dfs(a,b-(C-c),C);
		if(c<A-a) dfs(a+c,b,0); else dfs(A,b,c-(A-a));
		if(c<B-b) dfs(a,b+c,0); else dfs(a,B,c-(B-b));
	}
}
int main()
{
	cin>>A>>B>>C;
	dfs(0,0,C);
	for(int i=0;i<=30;i++)
	if(h[i]==1) cout<<i<<' ';
}