I have some problem with my code.It can accept the simple data.but I got wrong answer on test 3.So who can help me?

this is my code.

include

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include

using namespace std;

vector< long long > graph[200022]; bool visit[200022]; long long n;

long long dfs(long long v) { visit[v]=true; for (long long it=*graph[v].begin();it!=*graph[v].end();++it) { if (!visit[it]) { return dfs(it)+1; } } return 0; }

int main() { long long treev,roadv; cin>>n>>treev>>roadv; for(long long i=1;i<n;i++) { long long x,y; cin>>x>>y; graph[x].push_back(y);
graph[y].push_back(x); } long long maxn=0,t=0,minn=200000000; for(long long i=1;i<=n;i++) { if(graph[i].size()==1) { memset(visit,0,sizeof(visit)); t=dfs(i); cout<<i<<" "<<t<<endl; } maxn=max(maxn,t); minn=min(minn,t); }

if(treev<roadv) 
    cout<<(maxn*treev+(n-maxn-1)*roadv);
else
    cout<<(minn*treev+(n-minn-1)*roadv);

return 0;

}