This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
const int maxn=120000+10,maxl=18;
vector<int>adj[maxn];
int res=1,n,m,timea=0,sz[maxn],alln[maxn],lca[maxl][maxn],ted[maxn],high[maxn],parh[maxn],vas[maxn];
pair<int,int>allq[maxn],stf[maxn];
int dfs(int u);
int kaf=(1<<18);
struct segment{
set<int>st[(1<<19)];
vector<int>v;
void clear(){
for(auto x:v){
st[x].clear();
}
v.clear();
}
void add(int i,int l,int r,int tl,int tr,int w){
if(l>r||l>tr||r<tl||tl>tr){
return ;
}
if(l>=tl&&r<=tr){
v.push_back(i);
st[i].insert(w);
return ;
}
int m=(l+r)>>1;
add((i<<1),l,m,tl,tr,w);
add((i<<1)^1,m+1,r,tl,tr,w);
return ;
}
void pors(int i,int w){
if(i==0){
return ;
}
int now=0;
while(true){
if((int)st[i].size()==0||(*st[i].rbegin())<=now){
break;
}
auto x=*st[i].upper_bound(now);
if(x==w){
st[i].erase(x);
now=x;
continue;
}
if(dfs(x)){
st[i].erase(x);
}
now=x;
}
pors((i>>1),w);
}
}seg;
struct segmentn{
set<int>st[(1<<19)];
vector<int>v;
void clear(){
for(auto x:v){
st[x].clear();
}
v.clear();
}
void add(int i,int w){
if(i==0){
return ;
}
v.push_back(i);
st[i].insert(w);
return add(i>>1,w);
}
void pors(int i,int l,int r,int tl,int tr,int w){
if(l>r||l>tr||r<tl||tl>tr){
return ;
}
if(l>=tl&&r<=tr){
int now=0;
while(true){
//cout<<"chy: "<<l<<" "<<r<<" "<<now<<" "<<(int)st[i].size()<<endl;
if((int)st[i].size()==0||(*st[i].rbegin())<=now){
break;
}
auto x=*st[i].upper_bound(now);
//cout<<"aha: "<<i<<" "<<l<<" "<<r<<" "<<x<<endl;
if(x==w){
//st[i].erase(x);
now=x;
continue;
}
if(dfs(x)){
//cout<<"nago: "<<i<<" "<<l<<" "<<r<<" "<<x<<endl;
st[i].erase(x);
}
now=x;
}
return ;
}
int m=(l+r)>>1;
pors((i<<1),l,m,tl,tr,w);
pors((i<<1)^1,m+1,r,tl,tr,w);
}
}segn;
bool cmp(int a,int b){
return sz[a]>sz[b];
}
int zird(int u,int v){
return stf[v].first<=stf[u].first&&stf[v].second>=stf[u].second;
}
int getlca(int u,int v){
if(zird(u,v)){
return v;
}
if(zird(v,u)){
return u;
}
for(int i=maxl-1;i>=0;i--){
if(lca[i][u]!=0&&zird(v,lca[i][u])==0){
u=lca[i][u];
}
}
return lca[0][u];
}
void callca(){
for(int i=1;i<maxl;i++){
for(int j=1;j<=n;j++){
lca[i][j]=lca[i-1][lca[i-1][j]];
}
}
}
void dfs1(int u=1,int par=0){
lca[0][u]=par;
sz[u]=1;
for(auto x:adj[u]){
if(x!=par){
high[x]=high[u]+1;
dfs1(x,u);
sz[u]+=sz[x];
}
}
if(u!=1){
sort(adj[u].begin(),adj[u].end());
adj[u].erase(lower_bound(adj[u].begin(),adj[u].end(),par));
}
sort(adj[u].begin(),adj[u].end(),cmp);
}
void dfs2(int u=1,int par=1){
parh[u]=par;
timea++;
stf[u].first=timea;
for(auto x:adj[u]){
dfs2(x,x==adj[u][0]?par:x);
}
stf[u].second=timea;
}
void vorod(){
segn.clear();
seg.clear();
timea=0;
memset(vas,0,sizeof(vas));
memset(ted,0,sizeof(ted));
cin>>n;
for(int i=1;i<=n;i++){
adj[i].clear();
alln[i]=-1;
}
for(int i=0;i<n-1;i++){
int u,v;
cin>>u>>v;
adj[u].push_back(v);
adj[v].push_back(u);
}
cin>>m;
for(int i=1;i<=m;i++){
ted[i]=0;
cin>>allq[i].first>>allq[i].second;
alln[allq[i].first]=i;
alln[allq[i].second]=i;
}
}
int dis(int u,int v){
int uv=getlca(u,v);
return high[u]+high[v]-2*high[uv];
}
int din(int uv,int u,int v){
int a=dis(u,v),b=dis(uv,u),c=dis(uv,v);
if(b+c==a){
return 1;
}
return 0;
}
void go(int u,int had,int ind){
////cout<<"in: "<<u<<" "<<had<<" "<<ind<<" "<<parh[u]<<" "<<lca[0][parh[u]]<<endl;
if(zird(had,parh[u])){
seg.add(1,0,kaf-1,stf[had].first+1,stf[u].first,ind);
return ;
}
go(lca[0][parh[u]],had,ind);
seg.add(1,0,kaf-1,stf[parh[u]].first,stf[u].first,ind);
}
void add(int u,int v,int ind){
int uv=getlca(u,v);
go(u,uv,ind);
go(v,uv,ind);
seg.add(1,0,kaf-1,stf[uv].first,stf[uv].first,ind);
}
void addn(int u,int ind){
segn.add(stf[u].first+kaf,ind);
}
void gop(int u,int had,int ind){
//cout<<"tof: "<<u<<" "<<had<<" "<<ind<<" "<<parh[u]<<" "<<stf[u].first<<" "<<stf[had].first<<" "<<stf[parh[u]].first<<endl;
if(zird(had,parh[u])){
segn.pors(1,0,kaf-1,stf[had].first,stf[u].first,ind);
return ;
}
gop(lca[0][parh[u]],had,ind);
segn.pors(1,0,kaf-1,stf[parh[u]].first,stf[u].first,ind);
}
void pors(int u,int v,int ind){
int uv=getlca(u,v);
gop(u,uv,ind);
gop(v,uv,ind);
}
int dfs(int u){
//cout<<"ins: "<<u<<endl;
if(vas[u]==1){
res=0;
return 1;
}
if(vas[u]==2){
return 1;
}
vas[u]=1;
seg.pors(stf[allq[u].second].first+1,u);
pors(allq[u].first,allq[u].second,u);
vas[u]=2;
//cout<<"out: "<<u<<endl;
return 0;
}
void solve(){
for(int i=1;i<=m;i++){
// //cout<<"wtf "<<i<<endl;
add(allq[i].first,allq[i].second,i);
// //cout<<i<<endl;
addn(allq[i].first,i);
// //cout<<"by: "<<i<<endl;
}
////cout<<"salam"<<endl;
res=1;
for(int i=1;i<=m;i++){
dfs(i);
}
if(res){
cout<<"Yes\n";
}
else{
cout<<"No\n";
}
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
//cout.tie(0);
int t;
cin>>t;
for(int asd=0;asd<t;asd++){
vorod();
dfs1();
dfs2();
callca();
solve();
}
}
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