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| #include<bits/stdc++.h>
#define maxn 210
using namespace std;
int n,m;
struct Edge{
int from,to,cap,flow;
};
struct Dinic
{
int n,m,s,t;
vector<Edge> edges;
vector<int> G[maxn];
bool vis[maxn];
int d[maxn];
int cur[maxn];
int an[maxn];
int u=0;
void AddEdge(int from,int to,int cap)
{
edges.push_back((Edge){from,to,cap,0});
edges.push_back((Edge){to,from,0,0});
m=edges.size();
G[from].push_back(m-2);
G[to].push_back(m-1);
}
bool bfs()
{
memset(vis,0,sizeof(vis));
queue<int> Q;
Q.push(s);
d[s]=0;
vis[s]=1;
while(!Q.empty())
{
int x=Q.front(); Q.pop();
for(int i=0;i<G[x].size();i++)
{
Edge& e=edges[G[x][i]];
if(!vis[e.to]&&e.cap>e.flow)
{
vis[e.to]=1;
d[e.to]=d[x]+1;
Q.push(e.to);
}
}
}
return vis[t];
}
int dfs(int x,int a)
{
if(x==t||a==0) return a;
int flow=0,f;
for(int& i=cur[x];i<G[x].size();i++)
{
Edge& e=edges[G[x][i]];
if(d[x]+1==d[e.to]&&(f=dfs(e.to,min(a,e.cap-e.flow)))>0)
{
e.flow+=f;
edges[G[x][i]^1].flow-=f;
flow+=f;
a-=f;
if(a==0) break;
}
}
return flow;
}
int Maxflow(int s,int t)
{
this->s=s;
this->t=t;
int flow=0;
while(bfs())
{
memset(cur,0,sizeof(cur));
flow+=dfs(s,2147483600);
}
return flow;
}
void ff(int x,int h)
{
if(1<=x&&x<=h)
{
u++;
an[u]=x;
}
vis[x]=1;
for(int i=0;i<G[x].size();i++)
{
Edge& e=edges[G[x][i]];
if(!vis[e.to]&&e.cap==e.flow&&e.cap)
{
ff(e.to,h);
}
}
}
void ans(int a,int b,int h)
{
memset(vis,0,sizeof(vis));
ff(s,h);
bool vv[maxn]={};
int nu=0;
bool bj=0;
for(int i=u;i>=1;i--)
{
if(an[i]==a) bj=1;
if(an[i]==b) bj=0;
if(bj==1) cout<<an[i]<<" ",vv[i]=1,nu++;
}
for(int i=1;i<=u;i++)
{
if(vv[i]==0)
{
cout<<an[i];
nu++;
if(nu!=u) cout<<" ";
}
}
cout<<endl;
}
};
void work()
{
Dinic dinic;
int a,b,mid;
int x,y;
cin>>n>>m;
cin>>a>>b>>mid;
for(int i=1;i<=n;i++)
{
if(i!=mid) dinic.AddEdge(i,i+n,1);
else dinic.AddEdge(i,i+n,2);
}
dinic.AddEdge(a+n,0,1);
dinic.AddEdge(b+n,0,1);
for(int i=1;i<=m;i++)
{
cin>>x>>y;
dinic.AddEdge(x+n,y,1);
dinic.AddEdge(y+n,x,1);
}
int o=dinic.Maxflow(mid,0);
dinic.ans(a,b,n);
}
int main()
{
int T;
cin>>T;
while(T--) work();
return 0;
}
|