Cod sursa(job #2830853)

Utilizator meinkampfEmanuel Pinzariu meinkampf Data 10 ianuarie 2022 12:19:23
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.24 kb
#include <bits/stdc++.h>
using namespace std;

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

//                   cost nod
priority_queue< pair<int, int> > q;
int n, m;
int d[50003], viz[50003];
vector< pair<int, int> > h[50003];
const int oo = 1e9;

void Dijkstra(int sursa)
{
    int i, k, cost, nod;
    for (i = 1; i <= n; i++)
        d[i] = oo;
    d[sursa] = 0;
    q.push( {0, sursa} );
    while (!q.empty())
    {
        k = q.top().second;
        q.pop();
        if (viz[k] == 0)
        {
            viz[k] = 1;
            for (auto e : h[k])
            {
                cost = e.first;
                nod = e.second;
                if (d[nod] > d[k] + cost)
                {
                    d[nod] = d[k] + cost;
                    q.push( {-d[nod], nod} );
                }
            }
        }
    }
}

void Afis()
{
    for (int i = 2; i <= n; i++)
        if (d[i] == oo) fout << "0 ";
        else fout << d[i] << " ";
}

void Citire()
{
    int x, y, c;
    fin >> n >> m;
    for (int i = 1; i <= m; i++)
    {
        fin >> x >> y >> c;
        h[x].push_back( {c, y} );
    }
    Dijkstra(1);
    Afis();
}

int main()
{
    Citire();
    return 0;
}