Cod sursa(job #3130427)

Utilizator vlvdVlad Hosu vlvd Data 17 mai 2023 19:25:33
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.51 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int n,m;
const int Nmax=50005;
const int oo=(1<<30);
int D[Nmax];
bool viz[Nmax];
vector <pair <int,int>>G[Nmax];
struct comparaDistante
{
    bool operator()(int x , int y){
        if(D[x]>D[y])
            return true;
        return false;
    }
};
priority_queue <int, vector<int>, comparaDistante> Coada;

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

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

void dijkstra(int start)
{
    for(int i=1;i<=n;i++)
        D[i]=oo;
    D[start]=0;
    Coada.push(start);
    viz[start]=true;
    while(!Coada.empty())
    {
        int nod_curent = Coada.top();
        Coada.pop();
        viz[nod_curent]=false;
        for(size_t i=0;i<G[nod_curent].size();i++)
        {
            int vecin= G[nod_curent][i].first;
            int cost = G[nod_curent][i].second;
            if(D[nod_curent]+cost<D[vecin])
                D[vecin]=D[nod_curent]+cost;
            if(viz[vecin]==false)
            {
                Coada.push(vecin);
                viz[vecin]=true;
            }
        }
    }
}

int main()
{
    citire();
    dijkstra(1);
    afisare();
    return 0;
}