Cod sursa(job #3272242)

Utilizator robertanechita1Roberta Nechita robertanechita1 Data 28 ianuarie 2025 23:43:38
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.12 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <set>

using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

vector<pair<int, int>>h[50005];
int n, m, p;
int d[50001];

void Dijkstra(int p)
{
    set <pair<int, int> >S;
    for (int i = 1; i <= n; i++)
        d[i] = 2e9;
    d[p] = 0;
    S.insert({ 1, p });
    while (!S.empty())
    {
        int cost = S.begin()->first;
        int nod = S.begin()->second;
        S.erase(S.begin());

        for (auto i : h[nod])
            if (d[nod] + i.first < d[i.second])
            {
                S.erase({ d[i.second],i.second });
                d[i.second] = d[nod] + i.first;
                S.insert({ d[i.second], i.second });
            }
    }

}

int main()
{
    int x, y, z;
    fin >> n >> m;
    for (int i = 1; i <= m; i++)
    {
        fin >> x >> y >> z;
        h[x].push_back({ z, y });
        ///   h[y].push_back({x, z});
    }
    Dijkstra(1);
    for (int i = 2; i <= n; i++)
        if (d[i] == 2e9) fout << "0 ";
        else fout << d[i] << " ";

    return 0;
}