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Cod sursa(job #389658)
#include <stdio.h>
#define max 50010
const int inf=1<<30;
struct lista
{
int nod,cost;
lista *next;
};
lista *g[max],*p;
int h[max],d[max],poz[max],min,c,i,j,n,m,lg;
void push(int i,int j,int c)
{
lista *p=new lista;
p->nod=j;
p->cost=c;
p->next=g[i];
g[i]=p;
}
void swap(int i,int j)
{
int t=h[i]; h[i]=h[j]; h[j]=t;
}
void upheap(int x)
{
while(x/2 && d[h[x]]<d[h[x/2]])
{
swap(x,x/2);
poz[h[x]]=x;
poz[h[x/2]]=x/2;
x/=2;
}
}
void downheap(int x)
{
int y=0;
while(x!=y)
{
y=x;
if(2*y<=lg && d[h[x]]>d[h[y*2]]) x=y*2;
if(2*y+1<=lg && d[h[x]]>d[h[y*2+1]]) x=y*2+1;
swap(x,y);
poz[h[x]]=x;
poz[h[y]]=y;
}
}
void remove()
{
swap(1,lg);
poz[h[1]]=1;
lg--;
downheap(1);
}
void insert(int x)
{
h[++lg]=x;
poz[h[lg]]=lg;
upheap(lg);
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
scanf("%d%d",&n,&m);
for(; m--; )
{
scanf("%d%d%d",&i,&j,&c);
push(i,j,c);
}
for(i=2; i<=n; i++) d[i]=inf;
d[1]=0;
insert(1);
while(lg)
{
min=h[1];
remove();
for(p=g[min]; p!=NULL; p=p->next)
if(d[p->nod]>d[min]+p->cost)
{
d[p->nod]=d[min]+p->cost;
if(poz[p->nod]) upheap(poz[p->nod]);
else insert(p->nod);
}
}
for(i=2; i<=n; i++)
if(d[i]==inf) printf("0 ");
else printf("%d ",d[i]);
return 0;
}