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Cod sursa(job #213976)
//cu heap
#include <stdio.h>
#define inf 1<<15
typedef struct nod
{
int val,cost;
nod *urm;
} adr;
adr *L[50000],*p;
int D[50000],H[50000],n,m,i,j,c,k,poz,min;
short int E[50000];
void down(int tata, int n)
{
int t,fiu;
fiu=tata<<1;
if (D[H[fiu+1]]<D[H[fiu]]) fiu++;
while (fiu<=n && D[H[tata]]>D[H[fiu]])
{
t=H[fiu]; H[fiu]=H[tata]; H[tata]=t;
tata=fiu; fiu<<=1;
}
}
void up(int fiu)
{
int t,tata=fiu>>1;
while (tata && D[H[tata]]>D[H[fiu]])
{
t=H[fiu]; H[fiu]=H[tata]; H[tata]=t;
fiu=tata; tata>>=1;
}
}
void heap()
{
for (int i=n>>1; i; i--) down(i,n);
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
scanf("%d %d\n",&n,&m);
for (k=1; k<=m; k++)
{
scanf("%d %d %d\n",&i,&j,&c);
p=new adr;
p->val=j; p->urm=L[i];
p->cost=c;
L[i]=p;
}
p=L[1];
H[n+1]=inf;
while (p)
{
D[p->val]=p->cost;
p=p->urm;
}
//heap-ul
for (i=1; i<=n; i++)
{
H[i]=i;
if (!D[i]) D[i]=inf;
}
heap();
//dijkstra
for (i=1; i<n; i++)
{
poz=H[1];
H[1]=H[n-i+1];
down(1,n-i+1);
E[poz]=1;
for (j=2; j<=n; j++)
if (!E[j])
{
p=L[poz];
while (p && p->val!=j) p=p->urm;
if (p)
{
if (D[poz]+p->cost<D[j]) D[j]=D[poz]+p->cost;
up(j);
}
}
}
for (i=2; i<=n; i++)
if (D[i]>=inf) printf("0 ");
else printf("%d ",D[i]);
return 0;
}