제출 #983309

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
983309		feev1x	사이버랜드 (APIO23_cyberland)	C++17	15 / 100	1286 ms	2097152 KiB

cyberland

#include "cyberland.h"

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

const double INF = numeric_limits<double>::max();

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) {
    vector<vector<pair<int, double>>> g(N);
    for (int i = 0; i < M; ++i) {
		g[x[i]].emplace_back(y[i], c[i]);
		g[y[i]].emplace_back(x[i], c[i]);
	}
	vector<vector<double>> dis(N, vector<double>(K + 1, INF));
	dis[0][0] = 0;
	set<tuple<double, int, int>> q;
	q.emplace(dis[0][0], 0, 0);
	while (!q.empty()) {
		auto [w, nearest, i] = *q.begin();
		q.erase(q.begin());
		for (auto [to, weight]: g[nearest]) {
			if (arr[to] == 0) weight = -dis[nearest][i];
			if (dis[to][i] > dis[nearest][i] + weight) {
				q.erase(tuple{dis[to][i], to, i});
				dis[to][i] = dis[nearest][i] + weight;
				q.emplace(dis[to][i], to, i);
			}
			if (arr[to] == 2 && i < K && dis[to][i + 1] > (dis[nearest][i] + weight) / 2.) {
				q.erase(tuple{dis[to][i + 1], to, i + 1});
				dis[to][i + 1] = (dis[nearest][i] + weight) / 2.;
				q.emplace(dis[to][i + 1], to, i + 1);
			}
		}
	}
	double res = INF;
	for (int i = 0; i <= K; ++i) res = min(dis[H][i], res);
	if (res == INF) res = -1;
	return res;
}

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