Submission #837049

#	Time	Username	Problem	Language	Result	Execution time	Memory
837049		aZvezda	Cyberland (APIO23_cyberland)	C++17	15 / 100	1008 ms	67712 KiB

cyberland

#include "cyberland.h"

#include <bits/stdc++.h>

const int MAX_N = 1e5 + 10;
const int MAX_K = 31;

typedef long double ld;

ld dist[2][MAX_N][MAX_K];

std::vector<std::pair<int, int> > g[MAX_N];

bool used[MAX_N];

void dfs(int x) {
	if(used[x]) { return; }
	used[x] = true;

	for(const auto &it : g[x]) {
		dfs(it.first);
	}
}

ld pw[MAX_K];

double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr) {
	for(int i = 0; i < N; i ++) {
		g[i].resize(0);
		used[i] = false;
	}
	for(int i = 0; i < M; i ++) {
		g[x[i]].push_back({y[i], c[i]});
		g[y[i]].push_back({x[i], c[i]});
	}

	dfs(0);

	K = std::min(K, MAX_K - 1);

	pw[0] = 1;
	for(int i = 1; i <= K; i ++) {
		pw[i] = (pw[i - 1] * 2.0);
	}

	for(int i = 0; i < N; i ++) {
		for(int j = 0; j <= K; j ++) {
			dist[0][i][j] = dist[1][i][j] = 1e18;
		}
	}

	dist[0][0][K] = 0;

	for(int left = K; left >= 0; left --) {
		std::priority_queue<std::pair<ld, int> > pq;

		if(left != K) {
			for(int i = 0; i < N; i ++) {
				if((used[i] && arr[i] == 0) || i == 0) {
					dist[0][i][left] = 0;
				}
				if(dist[0][i][left] < 1e17) {
					pq.push({-dist[0][i][left], i});
				}
				if(dist[1][i][left] < 1e17) {
					pq.push({-dist[1][i][left], i + MAX_N});
				}
			}
		}

		while(!pq.empty()) {
			auto curr = pq.top(); pq.pop();
			curr.first *= -1;
			bool used = curr.second / MAX_N;
			curr.second %= MAX_N;
			if(curr.first > dist[used][curr.second][left]) {
				continue;
			}
			if(curr.second == H) { continue; }
			for(const auto &it : g[curr.second]) {
				ld new_cost = curr.first + it.second / pw[left];
				if(dist[0][it.first][left] > new_cost) {
					dist[0][it.first][left] = new_cost;
					pq.push({-new_cost, it.first});
				}
			}
		}

		for(int i = 0; i < N; i ++) {
			if(arr[i] == 2) {
				dist[1][i][left - 1] = dist[0][i][left];
			}
		}
	}

	ld ret = std::min(dist[0][H][0], dist[1][H][0]);
	if(ret > 1e17) {
		return -1;
	}

	return ret;
}

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