Cod sursa(job #2171611)

Utilizator DR27092000Bilcu Dragos Gabriel DR27092000 Data 15 martie 2018 12:53:42
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.39 kb
#include <bits/stdc++.h>

using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
vector<pair<int,int> >Lista[50001];
int d[50001],n,m;
const int inf=(1<<30);
bool viz[50001];
struct comp
{ bool operator()(int x,int y){return d[x]>d[y];}

};
priority_queue<int,vector<int>,comp>Coada;
void Citire()
{
    f>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y,c;
        f>>x>>y>>c;
        Lista[x].push_back({y,c});
    }

}
void Dijkstra(int nodStart)
{
    for(int i=1;i<=n;i++)
        d[i]=inf;
        d[nodStart]=0;
        Coada.push(nodStart);
        viz[nodStart]=true;

        while(!Coada.empty())
        {
            int nod=Coada.top();
            Coada.pop();
            viz[nod]=false;
            for(int i=0;i<Lista[nod].size();i++)
            {
                int vecin=Lista[nod][i].first;
                int cost=Lista[nod][i].second;
                if(d[vecin]>d[nod]+cost)
                    {
                        d[vecin]=d[nod]+cost;
                        if(viz[vecin]==false)
                        {
                        Coada.push(vecin);
                        viz[vecin]=true;

                         }
                    }
            }
        }

}
int main()
{Citire();
Dijkstra(1);
for(int i=2;i<=n;i++)
    if(d[i]!=inf) g<<d[i]<<" ";
    else g<<'0'<<" ";

    return 0;
}