// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h>
using namespace std;
template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
#define REP(i, s, e) for (int i = s; i < e; i++)
#define RREP(i, s, e) for (int i = s; i >= e; i--)
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;
#ifndef DEBUG
#define cerr if (0) cerr
#endif
const int INF = 1000000005;
const ll LINF = 1000000000000000005ll;
const int MAXN = 200005;
const int MAXL = 20;
int q;
int n, m;
vi adj[MAXN], radj[MAXN * 50];
int s[MAXN], t[MAXN];
int mps[MAXN], mpt[MAXN];
int p[MAXL][MAXN], id[MAXL][MAXN], ptr;
int lvl[MAXN];
void dfs(int u, int cp) {
p[0][u] = cp;
cerr << u << '\n';
REP (k, 1, MAXL) {
if (p[k - 1][u] == -1) {
p[k][u] = -1;
} else {
cerr << ' ' << k << '\n';
p[k][u] = p[k - 1][p[k - 1][u]];
id[k][u] = ptr;
radj[id[k - 1][u]].pb(id[k][u]);
radj[id[k][u] ^ 1].pb(id[k - 1][u] ^ 1);
cerr << id[k - 1][u] << " -> " << id[k][u] << '\n';
cerr << (id[k][u] ^ 1) << " -> " << (id[k - 1][u] ^ 1) << '\n';
if (p[k][u] != -1) {
radj[id[k - 1][p[k - 1][u]]].pb(id[k][u]);
radj[id[k][u] ^ 1].pb(id[k - 1][p[k - 1][u]] ^ 1);
cerr << id[k - 1][p[k - 1][u]] << " -> " << id[k][u] << '\n';
cerr << (id[k][u] ^ 1) << " -> " << (id[k - 1][p[k - 1][u]] ^ 1) << '\n';
}
ptr += 2;
}
}
for (int v : adj[u]) {
if (v == cp) continue;
lvl[v] = lvl[u] + 1;
dfs(v, u);
}
}
int vis[MAXN * 60];
bool cyc;
void rdfs(int u) {
vis[u] = 1;
for (int v : radj[u]) {
cerr << u << ' ' << v << '\n';
if (vis[v] == 1) {
cyc = 1;
} else if (!vis[v]) {
rdfs(v);
}
}
vis[u] = 2;
}
int main() {
#ifndef DEBUG
ios::sync_with_stdio(0), cin.tie(0);
#endif
cin >> q;
while (q--) {
cin >> n;
REP (i, 0, n + 1) {
adj[i].clear();
mps[i] = 0, mpt[i] = 0;
}
REP (i, 1, n) {
int a, b; cin >> a >> b;
adj[a].pb(b);
adj[b].pb(a);
}
cin >> m;
ptr = m;
if (ptr & 1) {
ptr++;
}
REP (i, 1, n + 1) {
id[0][i] = ptr;
ptr += 2;
}
REP (i, 0, m) {
cin >> s[i] >> t[i];
mps[s[i]] = i, mpt[t[i]] = i;
radj[i].pb(id[0][s[i]]);
radj[id[0][t[i]] ^ 1].pb(i);
cerr << i << " -> " << id[0][s[i]] << '\n';
cerr << (id[0][t[i]] ^ 1) << " -> " << i << '\n';
}
dfs(n / 2, -1);
REP (i, 0, m) {
int u = s[i], v = t[i];
if (mpt[u] != 0) {
radj[i].pb(mpt[u]);
cerr << i << " -> " << mpt[u] << '\n';
}
if (mps[v] != 0) {
radj[mps[v]].pb(i);
cerr << mps[v] << " -> " << i << '\n';
}
if (lvl[u] < lvl[v]) {
swap(u, v);
}
auto jump = [&] (int &u, int k) {
radj[id[k][u]].pb(i);
radj[i].pb(id[k][u] ^ 1);
cerr << id[k][u] << " -> " << i << '\n';
cerr << i << " -> " << (id[k][u] ^ 1) << '\n';
u = p[k][u];
};
u = p[0][u];
RREP (k, MAXL - 1, 0) {
if (p[k][u] == -1) continue;
if (lvl[p[k][u]] >= lvl[v]) {
jump(u, k);
}
}
bool hasj = 0;
if (lvl[u] < lvl[v]) {
hasj = 1;
v = p[0][v];
}
if (u == v) {
continue;
}
if (hasj) {
jump(v, 0);
} else {
v = p[0][v];
}
jump(u, 0);
RREP (k, MAXL - 1, 0) {
if (p[k][u] != p[k][v]) {
jump(u, k);
jump(v, k);
}
}
jump(u, 0); jump(v, 0);
jump(u, 0);
}
cyc = 0;
REP (i, 0, m) {
if (vis[i]) continue;
rdfs(i);
if (cyc) {
break;
}
}
if (cyc) {
cout << "No\n";
} else {
cout << "Yes\n";
}
REP (i, 0, ptr) {
radj[i].clear();
vis[i] = 0;
}
}
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
118 ms |
239940 KB |
Output is correct |
| 2 |
Incorrect |
124 ms |
240008 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
110 ms |
240008 KB |
Output is correct |
| 2 |
Correct |
112 ms |
239976 KB |
Output is correct |
| 3 |
Incorrect |
108 ms |
240076 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
110 ms |
240008 KB |
Output is correct |
| 2 |
Correct |
112 ms |
239976 KB |
Output is correct |
| 3 |
Incorrect |
108 ms |
240076 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
110 ms |
240008 KB |
Output is correct |
| 2 |
Correct |
112 ms |
239976 KB |
Output is correct |
| 3 |
Incorrect |
108 ms |
240076 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
110 ms |
240008 KB |
Output is correct |
| 2 |
Correct |
112 ms |
239976 KB |
Output is correct |
| 3 |
Incorrect |
108 ms |
240076 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
116 ms |
240008 KB |
Output is correct |
| 2 |
Incorrect |
127 ms |
240024 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
118 ms |
239940 KB |
Output is correct |
| 2 |
Incorrect |
124 ms |
240008 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
