Pagini recente » Cod sursa (job #930577) | Cod sursa (job #2198896) | Cod sursa (job #472255) | Cod sursa (job #939610) | Cod sursa (job #2901007)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int NMax = 50005;
const int oo = (1 << 30);
int N,M;
int D[NMax];
bool viz[NMax];
vector < pair <int,int> > G[NMax];
struct compara
{
bool operator() (int x,int y)
{
return D[x]>D[y];
}
};
priority_queue<int, vector<int>, compara> coada;
void citire()
{
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 nod)
{
for(int i=1; i<=N; i++)
D[i]=oo;
D[nod]=0;
coada.push(nod);
while(!coada.empty())
{
int nodcurent=coada.top();
coada.pop();
viz[nodcurent] = 1;
for(size_t i=0; i<G[nodcurent].size(); i++)
{
int vecin=G[nodcurent][i].first;
int cost=G[nodcurent][i].second;
if(D[vecin]>D[nodcurent]+cost)
{
D[vecin]=D[nodcurent]+cost;
}
if(!viz[vecin])
coada.push(vecin);
}
}
}
void afisare()
{
for(int i=2; i<=N; i++)
{
if(D[i]!=oo)g<<D[i]<<" ";
else g<<0<<" ";
}
}
int main()
{
citire();
Dijkstra(1);
afisare();
return 0;
}