Cod sursa(job #2209336)

Utilizator stanbianca611Stan Bianca stanbianca611 Data 2 iunie 2018 21:05:17
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.52 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream f("dijkstra.in");
ofstream fout ("dijkstra.out");
const int nmax=50005, oo=(1<<30);
int n, m;
int d[nmax];
bool inCoada[nmax];

vector < pair < int, int > > g[nmax];

struct compara
{
    bool operator() (int x, int y)
    {
        return d[x]>d[y];
    }

};
priority_queue <int, vector<int>, compara> coada;

void citeste()
{
    int x, y, c;
    f>>n>>m;
    for(int i=1; i<=m; i++)
    {
        f>>x>>y>>c;
        g[x].push_back(make_pair(y,c));
    }

}

void dijkstra(int nod)
{
    for(int i=1; i<=n; i++)
        d[i]=oo;
    d[nod]=0;
    coada.push(nod);
    inCoada[nod]= true;
    while(!coada.empty())
    {
        int nodCurent=coada.top();
        coada.pop();
        inCoada[nodCurent]=false;

        for(size_t i=0; i<g[nodCurent].size(); i++)
        {
            int vecin=g[nodCurent][i].first;
            int cost=g[nodCurent][i].second;
            if(d[nodCurent]+cost<d[vecin])
            {
                d[vecin]=d[nodCurent]+cost;
                if(inCoada[vecin]==false)
                {
                    coada.push(vecin);
                    inCoada[vecin]=true;
                }
            }
        }
    }

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

    citeste();
    dijkstra(1);
    afiseaza();
    return 0;
}