Submission #891005

#	Time	Username	Problem	Language	Result	Execution time	Memory
891005		abushbandit_1	Jail (JOI22_jail)	C++17	0 / 100	5078 ms	468 KiB

jail

/*
 
author : abushbandit
contest : ---
 
*/
 
#include "bits/stdc++.h"
 
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
 
using namespace __gnu_pbds;
 
using namespace std;
 
#define int long long
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define ff first
#define ss second
#define pb push_back
#define rep(i,s,f) for(int i = s;i < f;i++)
 
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
 
#pragma GCC optimize("Ofast,no-stack-protector,fast-math",3)
 
template <class type1>
	using ordered_multiset = tree <type1, null_type, less_equal <type1>, rb_tree_tag, tree_order_statistics_node_update>;
 
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<pair<int,int>> vii;
typedef pair<int,int> pii;
 
const ll INF = 1e18;
const ll MOD7 = 1e9 + 7;
const ll MOD9 = 998244353;
const ld PI = acos(-1.0);
const int N = 120000 + 2;
 
template <class F, class _S>
bool chmin(F &u, const _S &v){
    bool flag = false;
    if ( u > v ){
        u = v; flag |= true;
    }
    return flag;
}
 
template <class F, class _S>
bool chmax(F &u, const _S &v){
    bool flag = false;
    if ( u < v ){
        u = v; flag |= true;
    }
    return flag;
    
}
 
int binpow (int a, int n) {
	int res = 1;
	while (n) {
		if (n & 1)
			res *= a;
		a *= a;
		n >>= 1;
	}
	return res;
}
 
void start_file(string file){
	freopen((file + ".in").c_str(),"r",stdin);
	freopen((file + ".out").c_str(),"w",stdout);
}

void solve() {
	
	int n;
	cin >> n;
	vector<vector<int>> g(n + 1);
	for(int i = 0;i < n - 1;i++){
		int a,b;
		cin >> a >> b;
		g[a].pb(b);
		g[b].pb(a);
	}
	int m;
	cin >> m;
	int s[m],t[m];
	vector<int> v;
	for(int i = 0;i < m;i++){
		cin >> s[i] >> t[i];
		
		v.pb(i);
	}
	//~ cout << m << endl;
	do{
		bool check = 1;
		vector<int> ans(n + 1);
		for(int i = 0;i < m;i++){
			vector<int> dis(n + 1);
			queue<pair<int,int>> q;
			q.push({s[v[i]],-1});
			dis[s[v[i]]] = 1;
			vector<int> pr(n + 1);
			pr[s[v[i]]] = -1;
			while(!q.empty()){
				auto [v,p] = q.front();
				q.pop();
				
				for(auto u : g[v]){
					if(u != p){
						dis[u] = dis[v] + 1;
						pr[u] = v;
						q.push({u,v});
					}
				}
			}
			int y = t[v[i]];
			while(y != -1){
				if(ans[y] == 1){
					check = 0;
					break;
				}
				y = pr[y];
			}
			ans[t[v[i]]] = 1;
			if(!check){
				break;
			}
		} 
		if(check){
			cout << "Yes" << '\n';
			return;
		}
	}while(next_permutation(all(v)));
	cout << "No" << '\n';
	
}

signed main() {
	
	ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
	
	int t = 1;
	cin >> t;
	while(t--){
		solve();
	}
 
}

Compilation message (stderr)

jail.cpp: In function 'void start_file(std::string)':
jail.cpp:75:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |  freopen((file + ".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jail.cpp:76:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |  freopen((file + ".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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