Pagini recente » Cod sursa (job #937457) | Cod sursa (job #1885177) | Cod sursa (job #1308865) | Cod sursa (job #1794260) | Cod sursa (job #1691019)
#include <fstream>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int n,m,a,b,c,i;
int h[50001],d[50001],idx[50001];
int hsize;
int inf=2000000000;
typedef struct celula{
int v;
celula *next;
int dist;
}*lista;
lista g[50001],p;
void downh()
{
int aux=1;
while(aux*2<=hsize)
{
int index=aux;
if(d[h[2*aux]]<d[h[aux]]) index=2*aux;
if(2*aux+1<=hsize)
if(d[h[2*aux+1]]<d[h[index]]) index=2*aux+1;
if(index==aux) break;
swap(idx[h[aux]],idx[h[index]]);
swap(h[aux],h[index]);
}
}
void uph(int x)
{
while(x>1 && d[h[x/2]]>d[h[x]])
{
swap(idx[h[x]],idx[h[x/2]]);
swap(h[x/2], h[x]);
x/=2;
}
}
int main()
{
fin>>n>>m;
for(i=1;i<=m;++i)
{
fin>>a>>b>>c;
p=new celula;
p->v=b;
p->dist=c;
p->next=g[a];
g[a]=p;
}
for(i=1;i<=n;++i)
h[i]=i,idx[i]=i,d[i]=inf;
d[1]=0;
hsize=n;
while(hsize>0)
{
int nodc=h[1];
idx[h[hsize]]=1;
h[1]=h[hsize];
--hsize;
downh();
for(lista i=g[nodc];i!=NULL;i=i->next)
if(d[i->v]>d[nodc]+i->dist)
{
d[i->v]=d[nodc]+i->dist;
uph(idx[i->v]);
}
}
for(i=2;i<=n;++i)
if(d[i]==inf) fout<<"0"<<" ";
else fout<<d[i]<<" ";
return 0;
}