//#pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>
//#define int long long
//#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define NHP ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
#define modwwe int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".ans","w",stdout)
#define pb push_back
#define checktime cerr << (double)clock() / CLOCKS_PER_SEC * 1000 << " ms";
using namespace std;
void phongbeo();
const int inf=1e9;
const int mod2=1e9+7;
const int mod1=998244353;
struct icd
{
long double a;
int b;
};
struct ib
{
int a;
int b;
};
struct ic
{
int a,b,c;
};
struct id
{
int a,b,c,d;
};
struct ie
{
int a,b,c,d,e;
};
int n,m,s1,s2,s4,s3,sf,k,s5,s6,mx,s7,s8,s9,mx2,res,dem2=0,dem=0,s33,dem3,dem4,l,r,mid;
int i,s10,s12;
int kk;
int el=29;
#define getchar_unlocked getchar
inline int scan(){
char c = getchar_unlocked();
int x = 0;
while(c<'0'||c>'9'){
c=getchar_unlocked();
}
while(c>='0'&&c<='9'){
x=(x<<1)+(x<<3)+c-'0';
c=getchar_unlocked();
}
return x;
}
main()
{
#ifndef ONLINE_JUDGE
//fin(task),fou(task);
#endif
NHP
/// cin>>s1;
int xx=scan();
// modwwe
while(xx--)
phongbeo(),down
//checktime
}
const int N=1e5+2e4+1;
int depth[N];
int head[N];
int pos[N];
int tout[N];
vector<int> v2[N];
vector<ib> v[N*8][2];
int heavy[N];
ib a[N];
int sz[N];
int mxz[N];
int c[N*8][2];
int par[N];
void dfs(int x,int y)
{
sz[x]=1;
mxz[x]=0;
par[x]=y;
depth[x]=depth[y]+1;
for(auto f:v2[x])
{
if(f!=y)
{
dfs(f,x);
sz[x]+=sz[f];
if(sz[f]>sz[x])
heavy[x]=f,mxz[x]=sz[f];
}
}
}
void des(int x,int y)
{
head[x]=y;
pos[x]=++dem;
if(heavy[x]!=0)
des(heavy[x],y);
for(auto f:v2[x])
if(pos[f]==0)
des(f,f);
tout[x]=dem;
}
struct IT
{
void setup(int node,int l,int r)
{
// cout<<node<<" "<<l<<" "<<r,debug
if(node!=1)v[node>>1][0].pb({node,0});
if(node!=1) v[node][1].pb({node>>1,1});
if(l==r)
{
return;
}
int mid=l+r>>1;
setup(node<<1,l,mid);
setup(node<<1|1,mid+1,r);
}
void upd(int node,int l,int r,int l1,int r1,int x)
{
if(l>=l1&&r<=r1)
{
v[x][0].pb({node,0});
// cout<<x<<" "<<node<<" "<<0,down
// if(x==5) cout<<node,debug
return;
}
int mid=l+r>>1;
if(l1<=mid)upd(node<<1,l,mid,l1,r1,x);
if(r1>=mid+1) upd(node<<1|1,mid+1,r,l1,r1,x);
}
void upd2(int node,int l,int r,int l1,int r1,int x)
{
if(l>=l1&&r<=r1)
{
v[node][1].pb({x,0});
return;
}
int mid=l+r>>1;
if(l1<=mid)upd2(node<<1,l,mid,l1,r1,x);
if(r1>=mid+1)upd2(node<<1|1,mid+1,r,l1,r1,x);
}
void upd_hld(int u, int v, int i,int dd){
while (head[u]!=head[v]){
if (depth[head[u]]<depth[head[v]]) swap(u, v);
upd(1, 1, n, pos[head[u]], pos[u], i);
u=par[head[u]];
}
if (depth[u]>depth[v]) swap(u, v);
upd(1, 1, n, pos[u]+dd, pos[v], i);
}
void upd_hld2(int u, int v, int i,int dd){
while (head[u]!=head[v]){
if (depth[head[u]]<depth[head[v]]) swap(u, v);
upd2(1, 1, n, pos[head[u]], pos[u], i);
u=par[head[u]];
}
if (depth[u]>depth[v]) swap(u, v);
if(pos[u]+dd<=pos[v])
upd2(1, 1, n, pos[u]+dd, pos[v], i);
}
} stt;
bool de;
bool check(int x,int y)
{
if(pos[x]<=pos[y]&&tout[x]>=pos[y]) return 1;
return 0;
}
void dfs2(int x,int y)
{
c[x][y]=1;
for(auto f:v[x][y]){
if(c[f.a][f.b ]==1){de=1; return;}
if(c[f.a][f.b]) continue;
dfs2(f.a,f.b);
if(de)return;
}
c[x][y]=2;
}
void phongbeo()
{
n=scan();
/// cach 1
de=0;
dem=0;
for(int i=1; i<=n; i++)
v2[i].clear(),heavy[i]=0,pos[i]=0,head[i]=0,depth[i]=0;
for(int i=1; i<=n*4; i++)
v[i][0].clear(),v[i][1].clear(),c[i][0]=c[i][1]=0;
for(int i=1; i<n; i++)
l=scan(),r=scan(),v2[l].pb(r),v2[r].pb(l);
dfs(1,0);
des(1,0);
stt.setup(1,1,n);
m=scan();
for(int i=1; i<=m; i++){
a[i].a=scan(),a[i].b=scan();
v[f[pos[a[i].a]]][0].pb({f[pos[a[i].b]],1});
if(check(a[i].a,a[i].b)){
stt.upd_hld(a[i].a,par[a[i].b],f[pos[a[i].a]],1);}
else if(check(a[i].b,a[i].a)){
stt.upd_hld(par[a[i].a],a[i].b,f[pos[a[i].a]],1);}
else {
stt.upd_hld(par[a[i].a],par[a[i].b],f[pos[a[i].a]],0);}
if(check(a[i].b,a[i].a))
stt.upd_hld2(a[i].a,a[i].b,f[pos[a[i].a]],1);
else stt.upd_hld2(a[i].a,par[a[i].b],f[pos[a[i].a]],0);
}
for(int i=1; i<=m; i++)
{
if(!c[f[pos[a[i].a]]][0]) dfs2(f[pos[a[i].a]],0);
if(de)break;
}
if(de) cout<<"No";
else cout<<"Yes";
}
Compilation message
jail.cpp:63:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
63 | main()
| ^~~~
jail.cpp: In function 'void des(int, int)':
jail.cpp:114:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
114 | if(pos[f]==0)
| ^~
jail.cpp:116:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
116 | tout[x]=dem;
| ^~~~
jail.cpp: In member function 'void IT::setup(int, int, int)':
jail.cpp:129:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
129 | int mid=l+r>>1;
| ~^~
jail.cpp: In member function 'void IT::upd(int, int, int, int, int, int)':
jail.cpp:142:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
142 | int mid=l+r>>1;
| ~^~
jail.cpp: In member function 'void IT::upd2(int, int, int, int, int, int)':
jail.cpp:154:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
154 | int mid=l+r>>1;
| ~^~
jail.cpp: In function 'void phongbeo()':
jail.cpp:214:10: error: 'f' was not declared in this scope
214 | v[f[pos[a[i].a]]][0].pb({f[pos[a[i].b]],1});
| ^
jail.cpp:228:15: error: 'f' was not declared in this scope
228 | if(!c[f[pos[a[i].a]]][0]) dfs2(f[pos[a[i].a]],0);
| ^
