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A.cpp
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A.cpp
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#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define endl "\n"
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
int main(){
fast;
ll n,x,y;
cin>>n;
vector<pair<ll,ll>> edges;
for(ll i=0;i<n-1;i++){
cin>>x>>y;
edges.push_back({x,y});
}
ll color[n+1];
for(ll i=1;i<=n;i++)
cin>>color[i];
map<ll,ll> mp;
ll cnt=0;
for(auto u: edges){
if(color[u.first]!=color[u.second]){
mp[u.first]++;
mp[u.second]++;
cnt++;
}
}
ll ans=0;
if(cnt){
for(auto u : mp){
if(u.second==cnt)
ans = u.first;
}
} else
ans = 1;
if(ans)
cout<<"YES"<<endl<<ans<<endl;
else
cout<<"NO"<<endl;
return 0;
}