Cod sursa(job #2114700)

Utilizator SamySam2099Irsai Samuel SamySam2099 Data 25 ianuarie 2018 19:25:29
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.28 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int Nmax=50000,oo=2000000000;
int n,m,D[Nmax+5];

vector<pair <int,int> >G[Nmax+5];

struct cmpD{

     bool operator()(int x,int y){
     return D[x]>D[y];
     }
};
priority_queue<int, vector<int>, cmpD>Q;
void read()
{
    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));
    }
}
bool viz[Nmax+5];
void Dijkstra(int nod)
{
   for(int i=1;i<=n;i++)
      if(i!=nod) D[i]=oo;
   viz[nod]=1;
   Q.push(nod);
   while(!Q.empty())
   {
      int x=Q.top();
      Q.pop();
      viz[x]=0;
      for(int i=0;i<(int)G[x].size();i++)
      {
          int vecin=G[x][i].first;
          int cost=G[x][i].second;
          if(D[vecin]>D[x]+cost)
          {
             D[vecin]=D[x]+cost;
             if(!viz[vecin])
             {
                 Q.push(vecin);
                 viz[vecin]=1;
             }
          }
      }
   }
}
void show()
{
    for(int i=2;i<=n;i++)
       {
           if(D[i]==oo) g<<"0"<<' ';
           else g<<D[i]<<' ';
       }
}
int main()
{
    read();
    Dijkstra(1);
    show();
    return 0;
}