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Cod sursa(job #360344)
#include<stdio.h>
#define INF 100000001
#define Nmx 50001
int n,m,Heap[Nmx],nr,viz[Nmx],C[Nmx];
struct nod
{
int inf,cost;
nod *urm;
};
nod *G[Nmx];
void schimba(int a,int b)
{
int aux=Heap[a];
Heap[a]=Heap[b];
Heap[b]=aux;
}
void add(int x,int y,int c)
{
nod *aux;
aux=new nod;
aux->urm=G[x];
aux->inf=y;
aux->cost=c;
G[x]=aux;
}
void citire()
{
int x,y,c;
scanf("%d%d",&n,&m);
for(int i=1;i<=m;++i)
{
scanf("%d%d%d",&x,&y,&c);
add(x,y,c);
}
}
void in_jos(int poz)
{
while(poz<=nr)
{
if(poz*2>nr) return;
int c=poz<<1;
if(c+1<=nr)
if(C[Heap[c+1]] < C[Heap[c]])
c++;
if (C[Heap[poz]]<= C[Heap[c]])
return;
viz[Heap[poz]]=c;
viz[Heap[c]]=poz;
schimba(poz,c);
poz=c;
}
}
void in_sus(int poz)
{
while (poz>1)
{
if (C[Heap[poz]]<C[Heap[poz/2]])
{
viz[Heap[poz]]=poz/2;
viz[Heap[poz/2]]=poz;
schimba(poz,poz/2);
poz=poz/2;
}
else
return ;
}
}
void dijkstra()
{
for(int i=1;i<=n;++i)
{
C[i]=INF;
viz[i]=-1;
}
C[1]=0;
Heap[1]=1;viz[1]=1;
nr=1;
int min;
while(nr)
{
min=Heap[1];
schimba(1,nr);
Heap[nr--]=0;
viz[Heap[1]]=1;
in_jos(1);
for(nod *p=G[min];p;p=p->urm)
if(C[min]+p->cost<C[p->inf])
{
C[p->inf]=C[min]+p->cost;
if(viz[p->inf]==-1)
{
Heap[++nr]=p->inf;
viz[p->inf]=nr;
in_sus(nr);
}
else
in_sus(viz[p->inf]);
}
}
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
citire();
dijkstra();
for(int i=2;i<=n;++i)
if(C[i]==INF) printf("0 ");
else printf("%d ",C[i]);
return 0;
}