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Cod sursa(job #594278)
#include <fstream>
#include <vector>
using namespace std;
const long Infinit=2000000005;
vector <long> G[65536];
vector <long> C[65536];
long D[65536], Heap[65536], P[65536], NH;
unsigned long N;
void Read ()
{
ifstream fin ("dijkstra.in");
long M, X, Y, Z;
fin >> N >> M;
for (; M>0; --M)
{
fin >> X >> Y >> Z;
G[X].push_back (Y);
C[X].push_back (Z);
}
fin.close ();
}
void Type ()
{
ofstream fout ("dijkstra.out");
unsigned long i;
for (i=2; i<=N; ++i)
{
if (D[i]==Infinit)
{
D[i]=0;
}
fout << D[i] << " ";
}
fout << "\n";
fout.close ();
}
inline void Swap (long X, long Y)
{
long Aux;
Aux=P[Heap[X]];
P[Heap[X]]=P[Heap[Y]];
P[Heap[Y]]=Aux;
Aux=Heap[X];
Heap[X]=Heap[Y];
Heap[Y]=Aux;
}
void Sift (long X)
{
long S=X<<1;
while (S<=NH)
{
if (((X<<1)+1<=NH)&&(D[Heap[S]]>D[Heap[(X<<1)+1]]))
{
S++;
}
if (D[Heap[S]]<D[Heap[X]])
{
Swap (X, S);
X=S;
S=X<<1;
}
else
{
return;
}
}
}
void Percolate (long X)
{
long F=X>>1;
while (F)
{
if ((D[Heap[F]]>D[Heap[X]])&&(F>0))
{
Swap (X, F);
X=F;
F=X>>1;
}
else
{
return;
}
}
}
inline void Insert (long X)
{
Heap[++NH]=X;
P[Heap[NH]]=NH;
Percolate (NH);
}
inline void Delete (long X)
{
Heap[X]=Heap[NH--];
P[Heap[X]]=1;
Sift (X);
}
void Dijkstra (long Start)
{
unsigned long i;
long NCurent;
for (i=1; i<=N; ++i)
{
P[i]=-1;
D[i]=Infinit;
}
D[Start]=0;
P[Start]=1;
Heap[++NH]=Start;
while (NH>0)
{
NCurent=Heap[1];
Delete (1);
for (i=0; i<G[NCurent].size (); ++i)
{
if (P[G[NCurent][i]]==-1)
{
D[G[NCurent][i]]=D[NCurent]+C[NCurent][i];
Insert (G[NCurent][i]);
}
if (D[G[NCurent][i]]>D[NCurent]+C[NCurent][i])
{
D[G[NCurent][i]]=D[NCurent]+C[NCurent][i];
Percolate (P[G[NCurent][i]]);
}
}
}
}
int main()
{
Read ();
Dijkstra (1);
Type ();
return 0;
}