Mai intai trebuie sa te autentifici.
Cod sursa(job #2684792)
Utilizator | Data | 14 decembrie 2020 20:48:52 | |
---|---|---|---|
Problema | Algoritmul lui Dijkstra | Scor | 20 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 1.15 kb |
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream cin ("dijkstra.in");
ofstream cout ("dijkstra.out");
vector <pair <int,int> > lista[50010]; ///first=nod; second=cost
priority_queue <pair <int,int> > dmin; ///first=nod; second=distanta
int dist[50010],viz[50010],n;
int main()
{
int m,i,a,b,c,nod,vecin,cost;
cin>>n>>m;
for (i=1; i<=m; i++)
{
cin>>a>>b>>c;
lista[a].push_back({b,c});
}
for (i=1; i<=n; i++)
dist[i]=1e9+5;
dist[1]=0;
dmin.push({1,0});
while (dmin.size()>0)
{
nod=dmin.top().first;
dmin.pop();
if (viz[nod]==0)
{
viz[nod]=1;
for (i=0; i<lista[nod].size(); i++)
{
vecin=lista[nod][i].first;
cost=lista[nod][i].second;
if (dist[nod]+cost<dist[vecin])
{
dist[vecin]=dist[nod]+cost;
dmin.push({vecin,-dist[vecin]});
}
}
}
}
for (i=2; i<=n; i++)
{
if (dist[i]==1e9+5)
dist[i]=0;
cout<<dist[i]<<" ";
}
return 0;
}