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Cod sursa(job #996808)
#include <fstream>
#include <vector>
#define NMax 50005
#define oo 2000000000
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int N,M,D[NMax],S[NMax];
vector < pair<int,int> > G[NMax];
void Read()
{
fin>>N>>M;
for(int i=1;i<=M;i++)
{
int x,y,c;
fin>>x>>y>>c;
G[x].push_back(make_pair(y,c));
}
}
inline void InitDijkstra (int Start)
{
for(int i=2;i<=N;i++)
D[i]=oo;
}
int ComputeMin()
{
int Min=oo,poz;
for(int i=1;i<=N;i++)
if((D[i]<Min) &&(!S[i]))
{
Min=D[i];
poz=i;
}
return poz;
}
inline void Relax(int Nod,int Vecin,int Cost)
{
if(D[Vecin]>D[Nod]+Cost)
D[Vecin]=D[Nod]+Cost;
}
void Dijkstra(int Start)
{
InitDijkstra(Start);
for(int i=1;i<=N;i++)
{
int Nod=ComputeMin();
S[Nod]=1;
for(unsigned int j=0;j<G[Nod].size();j++)
Relax(Nod,G[Nod][j].first,G[Nod][j].second);
}
}
void Print()
{
for(int i=2;i<=N;i++)
fout<<D[i]<<" ";
fout<<'\n';
}
int main()
{
Read();
Dijkstra(1);
Print();
return 0;
}