Cod sursa(job #2866214)

Utilizator tibi25Ned Edu tibi25 Data 9 martie 2022 14:15:16
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.53 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>

using namespace std;

ifstream f("dijkstra.in");
ofstream g("dijkstra.out");

const int NMAX=50005;
const int oo=(1 << 30);
int n,m;
int D[NMAX];
bool Incoada[NMAX];
vector < pair < int,int > > G[NMAX];
struct comparaDistante
{
    bool operator()(int x,int y )
        {return D[x]>D[y];}
};
priority_queue < int , vector < int >, comparaDistante > Coada;
void Citeste()
{
    f>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y,c;
        f>>x>>y>>c;
        G[x].push_back(make_pair(y,c));
    }
}
void Dijkstra(int nodstart)
{
    for(int i=1;i<=n;i++)
        D[i]=oo;
    D[nodstart]=0;
    Coada.push(nodstart);
    Incoada[nodstart]=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)
            g<<D[i]<<" ";
    else
        g<<"0 ";
}
int main()
{
    Citeste();
    Dijkstra(1);
    Afiseaza();
    return 0;
}