Submission #975644

#	Time	Username	Problem	Language	Result	Execution time	Memory
975644		XXBabaProBerkay	Cyberland (APIO23_cyberland)	C++17	0 / 100	1556 ms	2097264 KiB

cyberland

#include "cyberland.h"

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

#define F first
#define S second

const double INF = 1e18 + 7;

vector<vector<pair<int, double>>> adj;
vector<bool> vis;

void DFS(int k, int& H)
{
	if (vis[k] || k == H)
		return;

	vis[k] = 1;

	for (pair<int, double> i : adj[k])
		DFS(i.F, H);
}

double solve(int N, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr)
{
	adj.resize(N);
	for (int i = 0; i < M; i++)
	{
		adj[x[i]].emplace_back(y[i], c[i]);
		adj[y[i]].emplace_back(x[i], c[i]);
	}

	vis.resize(N);
	DFS(0, H);

	priority_queue<pair<double, int>, vector<pair<double, int>>, greater<pair<double, int>>> PQ;
	vector<vector<double>> dist(N, vector<double>(K + 1, INF));
	for (int i = 0; i < N; i++)
		if (vis[i] && arr[i] == 0)
		{
			dist[i][0] = 0;
			PQ.emplace(0, i);
		}

	dist[0][0] = 0;
	PQ.emplace(0, 0);
	while (!PQ.empty())
	{
		double d;
		int u;
		tie(d, u) = PQ.top();
		PQ.pop();

		if (d != dist[u][0] || u == H)
			continue;

		for (pair<int, double> i : adj[u])
		{
			int v;
			double w;
			tie(v, w) = i;
			if (dist[v][0] > dist[u][0] + w)
				PQ.emplace(dist[v][0] = dist[u][0] + w, v);
		}
	}

	for (int i = 1; i <= K; i++)
	{
		for (int j = 0; j < N; j++)
			if (vis[j] && arr[j] == 0)
			{
				dist[j][i] = 0;
				PQ.emplace(0, j);
			}

		dist[0][i] = 0;
		PQ.emplace(0, 0);
		while (!PQ.empty())
		{
			int u;
			double d;
			tie(d, u) = PQ.top();
			PQ.pop();
			if (d != dist[u][i] || u == H)
				continue;

			for (pair<int, double> j : adj[u])
			{
				int v;
				double w;
				tie(v, w) = j;
				if (dist[v][i] > (dist[u][i - 1] + w) / 2.0 && arr[v] == 2)
					PQ.emplace(dist[v][i] = (dist[u][i - 1] + w) / 2.0, v);

				if (dist[v][i] > dist[u][i] + w)
					PQ.emplace(dist[v][i] = dist[u][i] + w, v);
			}
		}
	}

	return (dist[H][K] == INF ? -1 : dist[H][K]);
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 19
• Subtask 5: 0 / 7
• Subtask 6: 0 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3