이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define all(x) (x).begin(),(x).end()
#define X first
#define Y second
#define sep ' '
#define endl '\n'
#define debug(x) cerr << #x << ": " << x << endl;
const ll MAXN = 1e6 + 10;
int n, m;
inline int solve() {
cin >> n;
for (int i = 1; i < n; i++) {
int u, v;
cin >> u >> v;
}
cin >> m;
vector<pll> vec;
for (int i = 1; i <= m; i++) {
int u, v;
cin >> u >> v;
vec.push_back({u, v});
}
sort(all(vec));
for (auto& e : vec)
swap(e.X, e.Y);
return cout << (is_sorted(all(vec)) ? "Yes" : "No") << endl, 0;
return 0;
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
int q;
cin >> q;
while (q--) solve();
return 0;
}
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