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Cod sursa(job #250035)
#include<fstream.h>
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
long viz[50010],n,m,d[50010];
struct coada
{
long inf;
coada *urm;
}*c,*ultim;
struct elem
{
long inf;
int cost;
elem *urm;
}*a[50010];
void citire()
{
int x,y,co;
elem *p;
f>>n>>m;
for(int i=0;i<m;i++)
{
f>>x>>y>>co;
p=new elem;
p->inf=y;
p->cost=co;
p->urm=a[x];
a[x]=p;
}
}
void prima()
{
elem *p;
d[1]=0;
for(int i=2;i<=n;i++)
{
d[i]=2000000000;
}
}
void implementare()
{
coada *q,*t;
elem *p;
c=new coada;
c->inf=1;
c->urm=NULL;
viz[1]=1;
ultim=c;
while(c!=NULL)
{
p=a[c->inf];
while(p!=NULL)
{
if(d[p->inf]>d[c->inf]+p->cost)
{
d[p->inf]=d[c->inf]+p->cost;
if(viz[p->inf]==0)
{
q=new coada;
viz[p->inf]=1;
q->inf=p->inf;
q->urm=NULL;
ultim->urm=q;
ultim=q;
}
}
p=p->urm;
}
t=c;
viz[c->inf]=0;
c=c->urm;
delete t;
}
}
void afisare()
{
for(int i=2;i<=n;i++)
{
if(d[i]==2000000000)
g<<0<<' ';
else
g<<d[i]<<' ';
}
}
int main()
{
citire();
prima();
implementare();
afisare();
g.close();
return 0;
}