Pagini recente » Cod sursa (job #1483726) | Cod sursa (job #2091900) | Cod sursa (job #2567208) | Cod sursa (job #68225) | Cod sursa (job #2165859)
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int NMAX = 50005;
const int oo = (1 << 31) - 1;
int n, m;
int D[NMAX];
bool InCoada[NMAX];
struct Compara
{
bool operator()(int x, int y){
return D[x] > D[y];
}
};
vector < pair < int, int > > G[NMAX];
priority_queue <int, vector <int>, Compara> Coada;
void Citeste()
{
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));
}
}
void Dijkstra(int nodStart)
{
for(int i = 1;i <= n;i++)
D[i] = oo;
D[nodStart] = 0;
Coada.push(nodStart);
InCoada[nodStart] = true;
while (!Coada.empty())
{
int nodCurent = Coada.top();
Coada.pop();
InCoada[nodCurent] = false;
for(unsigned i = 0;i < G[nodCurent].size();i++){
int Vecin = G[nodCurent][i].first;
int Cost = G[nodCurent][i].second;
if(D[nodCurent] + Cost < D[Vecin])
{
D[Vecin] = D[nodCurent] + Cost;
if(!InCoada[Vecin])
{
InCoada[Vecin] = true;
Coada.push(Vecin);
}
}
}
}
}
void Afiseaza()
{
for(int i = 2;i <= n;i++)
{
if(D[i]!=oo)
g<<D[i]<<" ";
else g<<0<<" ";
}
}
int main()
{
Citeste();
Dijkstra(1);
Afiseaza();
return 0;
}