Submission #890800

#	Time	Username	Problem	Language	Result	Execution time	Memory
890800		Minbaev	Jail (JOI22_jail)	C++17	0 / 100	14 ms	25972 KiB

jail

#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);

void dfs(int x,int pr){
		
	for(auto to:v[x]){
		if(to!=pr){
			pred[to] = x;
			dfs(to,x);
		}
	}	
		
}

void solve(){
	
	int n,m,k;
	
	cin>>n;
	
	//~ for(int i = 1;i<=n;i++)v[i].clear();
	
	for(int i = 1;i<n;i++){
		int a,b;
		cin>>a>>b;
		//~ v[a].pb(b);
		//~ v[b].pb(a);
	}
	
	cin>>m;
	
	vector<int>vis(n+1);
	while(m--){
		int a,b;
		cin>>a>>b;
		if(a>b)swap(a,b);
		vis[a]++;
		if(vis[a]==2){
			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 (stderr)

jail.cpp: In function 'void solve()':
jail.cpp:48:10: warning: unused variable 'k' [-Wunused-variable]
   48 |  int n,m,k;
      |          ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23