Cod sursa(job #2293189)

Utilizator grecubogdanGrecu Bogdan grecubogdan Data 30 noiembrie 2018 17:25:56
Problema Algoritmul lui Dijkstra Scor 80
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.35 kb
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int n,nn,y,x,l,i,d[50005],viz[50005],vecin,cost;
int oo;
vector<pair<int,int> > m[50005];
struct compara
{
    bool operator()(int x,int y)
    {
        return m[x]>m[y];
    }
};
priority_queue<int, vector<int>, compara > coada;
void read()
{
    f>>n>>nn;
    for(i=1;i<=nn;i++)
    {
        f>>x>>y>>l;
        m[x].push_back(make_pair(y,l));
    }
}
void dijkstra(int nodstart)
{
    int nod;
    for(i=1;i<=n;i++)
        d[i]=oo;
    d[nodstart]=0;
    coada.push(nodstart);
    viz[nodstart]=1;
    while(!coada.empty())
    {
        nod=coada.top();
        coada.pop();
        viz[nod]=0;
        for(i=0;i<m[nod].size();i++)
        {
            vecin=m[nod][i].first;
            cost=m[nod][i].second;
            if(d[nod]+cost<d[vecin])
            {
                d[vecin]=d[nod]+cost;
                if(viz[vecin]==0)
                {
                    coada.push(vecin);
                    viz[vecin]=1;
                }
            }
        }
    }
}
void afiseaza()
{
    for(i=2;i<=n;i++)
    {
        if(d[i]!=oo)
            g<<d[i]<<" ";
        else g<<"0 ";
    }
}
int main()
{
    oo=(1<<30);
 read();
 dijkstra(1);
 afiseaza();
 return 0;
}