Cod sursa(job #2860314)

Utilizator Seress26Seres Artur Seress26 Data 2 martie 2022 12:50:57
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.56 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#include <limits.h>
///Dijkstra2.
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int MAX=500001;
const int oo=INT_MAX;
int n,m,D[MAX],i,j,a,b,c,p;
bool InCoada[MAX];
vector < pair< int,int> >G[MAX];
struct comp
{
    bool operator()(int x,int y)
    {
        return D[x]>D[y];
    }
};
priority_queue <int, vector <int> ,comp >q;
void Citire()
{
    f>>n;
    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>a;
        f>>b;
        f>>c;
        G[a].push_back(make_pair(b,c));
        G[b].push_back(make_pair(a,c));
    }
}
void Rezolvare(int Start)
{
    int Curent,Vecin,Cost;
    for(i=1;i<=n;i++)
        D[i]=oo;
    D[Start]=0;
    q.push(Start);
    InCoada[Start]=true;
    while(!q.empty())
    {
        Curent=q.top();
        q.pop();
        InCoada[Curent]=false;
        for(size_t i=0;i<=G[Curent].size();i++)
        {
            Vecin=G[Curent][i].first;
            Cost=G[Curent][i].second;
            if(D[Curent]+Cost<D[Vecin])
            {
                D[Vecin]=D[Curent]+Cost;
                if(InCoada[Vecin]==false)
                {
                    q.push(Vecin);
                    InCoada[Vecin]=true;
                }
            }
        }
    }
}
void Afisare()
{
    for(i=1;i<=n;i++)
    {
        if(D[i]!=oo)
            g<<D[i]<<' ';
        else
            g<<0<<' ';
    }
}
int main()
{
    Citire();
    Rezolvare(1);
    Afisare();

    return 0;
}