Submission #965120

#	Time	Username	Problem	Language	Result	Execution time	Memory
965120		vjudge1	Jail (JOI22_jail)	C++17	0 / 100	93 ms	880 KiB

jail

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #include <x86intrin.h>

#include <bits/stdc++.h>
#include <chrono>
#include <random>

// @author: Vlapos

namespace operators
{
	template <typename T1, typename T2>
	std::istream &operator>>(std::istream &in, std::pair<T1, T2> &x)
	{
		in >> x.first >> x.second;
		return in;
	}

	template <typename T1, typename T2>
	std::ostream &operator<<(std::ostream &out, std::pair<T1, T2> x)
	{
		out << x.first << " " << x.second;
		return out;
	}

	template <typename T1>
	std::istream &operator>>(std::istream &in, std::vector<T1> &x)
	{
		for (auto &i : x)
			in >> i;
		return in;
	}

	template <typename T1>
	std::ostream &operator<<(std::ostream &out, std::vector<T1> &x)
	{
		for (auto &i : x)
			out << i << " ";
		return out;
	}

	template <typename T1>
	std::ostream &operator<<(std::ostream &out, std::set<T1> &x)
	{
		for (auto &i : x)
			out << i << " ";
		return out;
	}
}

// name spaces
using namespace std;
using namespace operators;
// end of name spaces

// defines
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define f first
#define s second
#define uint unsigned int
#define all(vc) vc.begin(), vc.end()
// end of defines

// usefull stuff

void boost()
{
	ios_base ::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
}

inline int getbit(int &x, int &bt) { return (x >> bt) & 1; }

const int dx4[4] = {-1, 0, 0, 1};
const int dy4[4] = {0, -1, 1, 0};
const int dx8[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
const int dy8[8] = {-1, -0, 1, -1, 1, -1, 0, 1};

const ll INF = (1e18) + 500;
const int BIG = (1e9) * 2 + 100;
const int MAXN = (1e5) + 5;
const int MOD7 = (1e9) + 7;
const int MOD9 = (1e9) + 9;
const uint MODFFT = 998244353;

// #define int ll

struct test
{
	vector<vector<int>> tree, G;
	vector<vector<int>> jump, IDS;
	vector<int> tin, tout, was;
	int CNT = 0;

	int timer = 0;

	bool isP(int pr, int v)
	{
		return tin[pr] <= tin[v] and tout[v] <= tout[pr];
	}

	void dfs(int v, int pr = 0)
	{
		tin[v] = ++timer;
		jump[v][0] = pr;
		{
			IDS[v][0] = CNT;
			G[CNT].pb(v);
			G[CNT].pb(pr);
			CNT++;
		}

		for (int k = 1; k < 20; ++k)
		{
			jump[v][k] = jump[jump[v][k - 1]][k - 1];
			{
				IDS[v][k] = CNT;
				G[CNT].pb(IDS[v][k - 1]);
				G[CNT].pb(IDS[jump[v][k - 1]][k - 1]);
				CNT++;
			}
		}

		for (auto tov : tree[v])
			if (tov != pr)
				dfs(tov, v);

		tout[v] = ++timer;
	}

	void makeEdges(int ST, int E)
	{

		if (!isP(ST, E))
		{
			int v = jump[ST][0];
			for (int k = 19; k >= 0; --k)
				if (!isP(jump[v][k], E))
				{
					G[ST].pb(IDS[v][k]);
					v = jump[v][k];
				}
			if (!isP(v, E))
			{
				G[ST].pb(v);
				v = jump[v][0];
			}
			assert(isP(v, E));
			G[ST].pb(v);
		}
		if (!isP(E, ST))
		{
			int v = E;
			for (int k = 19; k >= 0; --k)
				if (!isP(jump[v][k], ST))
				{
					G[ST].pb(IDS[v][k]);
					v = jump[v][k];
				}
			G[ST].pb(v);
		}
	}

	bool DFS(int v)
	{
		was[v] = 1;
		for (auto tov : G[v])
			if (was[tov] == 1 or (!was[tov] and DFS(tov)))
				return true;

		was[v] = 2;
		return false;
	}

	void solve(int testcase)
	{
		boost();

		int n;
		cin >> n;
		CNT = n;
		G.resize(n * 21);
		was.resize(n * 21);
		jump.resize(n, vector<int>(20));
		IDS.resize(n, vector<int>(20));
		tree.resize(n);
		tin.resize(n);
		tout.resize(n);

		for (int i = 1; i < n; ++i)
		{
			int v, tov;
			cin >> v >> tov;
			--v, --tov;
			tree[v].pb(tov);
			tree[tov].pb(v);
		}

		dfs(0);
		int m;
		cin >> m;
		vector<pii> els;
		for (int i = 0; i < m; ++i)
		{
			int v, tov;
			cin >> v >> tov;
			--v, --tov;
			// els.pb({v, tov});
			// makeEdges(v, tov);
			if (!isP(v, tov))
			{
				int st = jump[v][0];
				while (!isP(st, tov))
				{
					G[v].pb(st);
					st = jump[st][0];
				}
				G[v].pb(st);
			}
			if (!isP(tov, v))
			{
				int st = tov;
				while (!isP(st, v))
				{
					G[v].pb(st);
					st = jump[st][0];
				}
			}
		}

		bool good = true;

		for (int i = 0; i < n; ++i)
			if (!was[i] and DFS(i))
			{
				good = false;
				break;
			}

		if (good)
			cout << "Yes\n";
		else
			cout << "No\n";
	}
};

main()
{
	boost();
	int q = 1;
	cin >> q;
	for (int i = 0; i < q; i++)
	{
		test t;
		t.solve(i);
	}
	return 0;
}
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//
//                                                                                    //
//                               Coded by Der_Vlἀpos                                  //
//                                                                                    //
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//

Compilation message (stderr)

jail.cpp:254:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  254 | main()
      | ^~~~

• 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