제출 #1153345

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1153345		TroySer	Cyberland (APIO23_cyberland)	C++20	15 / 100	58 ms	13124 KiB

cyberland

#include <bits/stdc++.h>
#include "cyberland.h"
#include <vector>

using namespace std;
using ll = long long;

const ll INF = 1e18;

vector<vector<ll> > adjList;
map<pair<ll, ll>, double> weightMat;

double dijkstras(ll startingNode, vector<int> &A) {

    ll N = adjList.size();
    
    priority_queue<pair<double, ll>, vector<pair<double, ll> >, greater<pair<double, ll> > > pq;
    pq.push({0.0, startingNode});

    vector<double> distances(N, (double)INF);
    distances[startingNode] = 0.0;

    while (!pq.empty()) {

        auto [currentDistance, currentNode] = pq.top();
        pq.pop();

        if (currentDistance > distances[currentNode]) {
            continue;
        }

        for (ll v: adjList[currentNode]) {
            if (currentDistance + weightMat[{currentNode, v}] < distances[v]) {
                distances[v] = currentDistance + weightMat[{currentNode, v}];
                pq.push({distances[v], v});
            }
        }

    }

    double minimumPossible = INF;
    for (ll i = 0; i < N; i++) {
        if (A[i] == 0 || i == 0) minimumPossible = min(minimumPossible, distances[i]);
    }

    return minimumPossible;

}

double solve(int N, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {

    adjList.clear();
    weightMat.clear();

    adjList.resize(N);

    for (ll i = 0; i < M; i++) {
        adjList[x[i]].push_back(y[i]);
        adjList[y[i]].push_back(x[i]);
        weightMat[{x[i], y[i]}] = (double)c[i];
        weightMat[{y[i], x[i]}] = (double)c[i];
    }

    double response = dijkstras(H, arr);

    if (response >= INF) {
        return -1.0;
    } else {
        return response;
    }

}

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