Submission #963951

#	Time	Username	Problem	Language	Result	Execution time	Memory
963951		vjudge1	Meetings 2 (JOI21_meetings2)	C++17	0 / 100	1 ms	456 KiB

meetings2

// #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 segTreeSum
{
	vector<int> tree;
	int sz;

	void init(int n)
	{
		sz = n;
		tree.resize(2 * sz, -1);
	}

	int get(int l, int r) // [l, r)
	{
		l += sz;
		r += sz;
		int res = 0;

		while (l < r)
		{
			if (l & 1)
				res = max(res, tree[l++]);
			if (r & 1)
				res = max(res, tree[--r]);
			l >>= 1;
			r >>= 1;
		}

		return res;
	}

	void set(int pos, int val)
	{
		pos += sz;
		tree[pos] = max(val, tree[pos]);
		pos >>= 1;
		while (pos)
		{
			tree[pos] = max(tree[pos << 1], tree[(pos << 1) + 1]);
			pos >>= 1;
		}
	}
};

struct test
{
	vector<vector<int>> tree;
	vector<int> answers, used, sz;
	segTreeSum rng;
	int n;

	void dfsSz(int v, int pr = -1)
	{
		sz[v] = 1;
		for (auto tov : tree[v])
			if (tov != pr and !used[tov])
			{
				dfsSz(tov, v);
				sz[v] += sz[tov];
			}
	}

	int dfsC(int v, int szA, int pr = -1)
	{
		for (auto tov : tree[v])
			if (!used[tov] and tov != pr and szA < sz[tov] * 2)
				return dfsC(tov, szA, v);
		return v;
	}

	vector<int> els;

	void dfs(int v, int d, int pr)
	{
		els.pb(sz[v]);
		if (sz[v] * 2 <= n)
		{
			int cur = rng.get(sz[v], n);
			if (cur != -1)
				answers[sz[v] * 2] = max(answers[sz[v] * 2], cur + d + 1);
		}
		rng.set(sz[v], d);
		for (auto tov : tree[v])
		{
			if (tov != pr and !used[tov])
				dfs(tov, d + 1, v);
		}
	}

	void getAns(int v)
	{
		dfsSz(v);
		v = dfsC(v, sz[v]);
		dfsSz(v);

		for (auto tov : tree[v])
			if (!used[tov])
			{
				dfs(tov, 1, v);
			}

		for (auto el : els)
			rng.set(el, -1);
		els.clear();
		els.shrink_to_fit();
		used[v] = 1;
		for (auto tov : tree[v])
			if (!used[tov])
				getAns(tov);
	}

	void solve(int testcase)
	{
		boost();

		cin >> n;

		used.resize(n);
		sz.resize(n);
		rng.init(n);
		tree.resize(n);
		answers.resize(n + 1);
		for (int i = 0; i < n - 1; ++i)
		{
			int v, tov;
			cin >> v >> tov;
			--v, --tov;
			tree[v].pb(tov);
			tree[tov].pb(v);
		}

		getAns(0);
		for (int i = (n / 2) * 2 - 2; i > 0; i -= 2)
		{
			answers[i] = max(answers[i], answers[i + 2]);
		}

		for (int i = 1; i <= n; ++i)
		{
			cout << max(1, answers[i]) << "\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)

meetings2.cpp:238:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  238 | main()
      | ^~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 16
• Subtask 3: 0 / 80