제출 #150200

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
150200		お前はもう死んでいる (#200)	Lokahian Relics (FXCUP4_lokahia)	C++17	0 / 100	17 ms	792 KiB

lokahia

#include "lokahia.h"
#include <bits/stdc++.h>
using namespace std;

const int N = 205;

mt19937_64 mt(969696);

int n, dsu[N], con[N][N];
vector<int> ve[N];

int rand(int l, int r)
{
	uniform_int_distribution<int> uni(l, r);
	return uni(mt);
}

int trace(int u)
{
	return dsu[u] < 0 ? u : dsu[u] = trace(dsu[u]);
}

int connect(int u, int v)
{
	if ((u = trace(u)) == (v = trace(v)))
		return -1;
	if (dsu[u] > dsu[v])
		swap(u, v);
	dsu[u] += dsu[v];
	dsu[v] = u;
	vector<int> tmp;
	for (int j = 1; j <= n; j++)
		if (con[u][j] == -1 || con[v][j] == -1)
			tmp.push_back(j);
	for (int &a : ve[u])
		for (int &b : ve[v])
			con[a][b] = con[b][a] = 1;
	for (int &b : ve[v])
		ve[u].push_back(b);
	ve[v].clear();
	for (int &a : ve[u])
		for (int &b : tmp)
			con[a][b] = con[b][a] = -1;
	if (-dsu[u] > n / 2)
		return u;
	return -1;
}

int FindBase(int _n)
{
	n = _n;
	for (int i = 0; i < n; i++)
	{
		dsu[i] = -1;
		ve[i] = {i};
		con[i][i] = 1;
	}
	for (int i = 1; i <= 300; i++)
	{
		int u, v, cnt = 0;
		do
		{
			u = rand(0, n - 1);
			v = rand(0, n - 1);
			cnt++;
		} while (con[u][v] != 0 && cnt <= 100);
		if (cnt > 100)
			break;
		u = trace(u); v = trace(v);
		int rt = CollectRelics(u, v);
		if (rt == -1)
		{
			for (int &a : ve[u])
				for (int &b : ve[v])
					con[a][b] = con[b][a] = -1;
		}
		else
		{
			connect(rt, u);
			int tmp = connect(rt, v);
			if (tmp >= 0)
				return tmp;
		}
	}
	for (int i = 0; i < n; i++)
		if (-dsu[i] > n / 2)
			return i;
	return -1;
}

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