#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("Ofast,unroll-loops")
#define pii pair<int,int>
using namespace __gnu_pbds;
using namespace std;
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long
#define f first
#define s second
#define pii pair<int,int>
template<class T>bool umax(T &a,T b){if(a<b){a=b;return true;}return false;}
template<class T>bool umin(T &a,T b){if(b<a){a=b;return true;}return false;}
typedef tree<int, null_type, less_equal<int>, rb_tree_tag,
tree_order_statistics_node_update> ordered_set;
const int mod= 1e9 +7;
const int N=1e5*4;
int binpow (int a, int n) {
if (n == 0)
return 1;
if (n % 2 == 1)
return binpow (a, n-1) * a;
else {
int b = binpow (a, n/2);
return b * b;
}
}
vector<int>v[N],pred(N);
vector<int>col(N),vis(N);
void dfs(int x,int pr){
vis[x] = 1;
for(auto to:v[x]){
if(to==pr||col[to])continue;
dfs(to,x);
}
}
void solve(){
int n,m,k;
cin>>n;
for(int i = 1;i<=n;i++){
v[i].clear();
vis[i] = 0;
col[i] = 0;
}
for(int i = 1;i<n;i++){
int a,b;
cin>>a>>b;
v[a].pb(b);
v[b].pb(a);
}
cin>>m;
vector<pii>g;
for(int i = 0;i<m;i++){
int a,b;
cin>>a>>b;
g.pb({a,b});
}
if(m>=6){
vector<int>ind;
for(int i = 0;i<m;i++)ind.pb(i);
do
{
//~ cout<<1<<endl;
for(int i = 1;i<=n;i++)col[i] = 0;
for(auto to:g){
col[to.f] += 1;
}
//~ cout<<1<<endl;
bool flag = true;
for(auto to:ind){
//~ cout<<1<<endl;
int a = g[to].f;
int b = g[to].s;
//~ cout<<to<<endl;
col[a]--;
for(int i = 1;i<=n;i++)vis[i] = 0;
if(col[a]>=1){
//~ cout<<ind[0]<<"-\n";
flag = false;
break;
}
//~ if(ind[0]==2&&ind[1]==1)
//~ cout<<col[b]<<endl;
dfs(a,-1);
//~ cout<<to<<endl;
col[b] ++;
if(vis[b]==0){
//~ cout<<ind[0]<<"=\n";
flag = false;
break;
}
}
if(flag){
//~ for(auto to:ind)cout<<to<<" ";
cout<<"Yes\n";
return;
}
} while (next_permutation(all(ind)));
cout<<"No\n";
}
else{
for(int i = 0;i<m;i++){
int l = min(g[i].f,g[i].s);
int r = max(g[i].f,g[i].s);
for(int j = 0;j<m;j++){
if(i==j)continue;
if(l<g[i].f&&g[i].f<r){
cout<<"No\n";
return;
}
}
}
cout<<"Yes\n";
}
}
signed main()
{
// freopen("seq.in", "r", stdin);
// freopen("seq.out", "w", stdout);
ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
int tt=1;cin>>tt;
while(tt--)solve();
}
Compilation message
jail.cpp: In function 'void solve()':
jail.cpp:47:11: warning: unused variable 'k' [-Wunused-variable]
47 | int n,m,k;
| ^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
19036 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
19036 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
19036 KB |
Output is correct |
| 2 |
Incorrect |
5 ms |
19036 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
19036 KB |
Output is correct |
| 2 |
Incorrect |
5 ms |
19036 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
19036 KB |
Output is correct |
| 2 |
Incorrect |
5 ms |
19036 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
19036 KB |
Output is correct |
| 2 |
Incorrect |
5 ms |
19036 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
19036 KB |
Output is correct |
| 2 |
Incorrect |
5 ms |
19032 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
19036 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
19036 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
