Submission #890833

#	Time	Username	Problem	Language	Result	Execution time	Memory
890833		Minbaev	Jail (JOI22_jail)	C++17	0 / 100	5 ms	13144 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 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;
	
	map<int,int>vis,vis1;
	vector<int>time[n+1];
	while(m--){
		int a,b;
		cin>>a>>b;
		int timer = 0;
		queue<pii>q;
		q.push({a,0});
		
		while(!q.empty()){
			auto [x,pr] = q.front();
			q.pop();
			
			for(auto to:v[x]){
				if(to==pr)continue;
				pred[to] = x;
				q.push({to,x});
			}
			
		}
		
		vector<int>vs;
		int y = b;
		
		while(y!=a){
			vs.pb(y);
			y = pred[y];
		}
		vs.pb(a);
		reverse(all(vs));
		
		for(auto to:vs){
			time[to].pb(timer);
			//~ cout<<to<<" ";
			timer++;
		}
		//~ cout<<"\n";
	}
	
	for(int i =1;i<=n;i++){
		if(time[i].empty())continue;
		sort(all(time[i]));
		for(int j = 0;j<time[i].size()-1;j++){
			if(time[i][j]==time[i][j+1]){
				//~ cout<<i<<"\n";
				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:95:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |   for(int j = 0;j<time[i].size()-1;j++){
      |                 ~^~~~~~~~~~~~~~~~~
jail.cpp:38:10: warning: unused variable 'k' [-Wunused-variable]
   38 |  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