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Cod sursa(job #505363)
#include <iostream>
#include <stdio.h>
#define nmax 50010
using namespace std;
struct nod {
int info, cost;
nod * next;
};
nod *G[nmax];
void add(int from, int to, int tip){
nod *p = new nod;
p->info = to;
p->cost = tip;
p->next = G[from];
G[from] = p;
}
int N, M;
void read()
{
freopen ("dijkstra.in","r",stdin);
freopen ("dijkstra.out","w",stdout);
int i, a, b, c;
scanf("%d %d",&N,&M);
for(i = 1; i <= M; i++){
scanf("%d %d %d",&a,&b,&c);
add(a,b,c);
}
}
const int inf = 1 << 31 - 1;
int H[nmax], Pos[nmax], d[nmax], L ;
void upheap(int p)
{
int aux;
while((p>>1) && d[H[p]] < d[H[p>>1]])
{
aux = H[p];
H[p] = H[p>>1];
H[p>>1] = aux;
Pos[H[p]] = p;
Pos[H[p>>1]] = p >> 1;
p = p>>1;
}
}
void downheap(int p)
{
int y(0), aux;
while(p != y)
{
y = p;
if((p<<1) <= L){
if(d[H[y]] > d[H[p<<1]])
y = p<<1;
}
else return;
if((p << 1) + 1<= L)
if(d[H[y]] > d[H[(p<<1) + 1]])
y = (p<<1) + 1;
if(y != p)
{
aux = H[p];
H[p] = H[y];
H[y] = aux;
Pos[H[p]] = p;
Pos[H[y]] = y;
p = y;
}
}
}
void solve()
{
int i, from;
nod *p;
for(i = 1; i <= N; i++)
d[i] = inf, Pos[i] = -1;
d[1] = 0;
H[++L] = 1;
Pos[1] = 1;
while(L){
from = H[1];
H[1] = H[L--];
Pos[H[1]] = 1;
downheap(1);
for(p = G[from]; p ; p = p->next)
if(d[p -> info] > d[from] + p->cost)
{
d[p->info] = d[from] + p->cost;
if(Pos[p->info] != -1)
upheap(Pos[p->info]);
else
{
H[++L] = p->info;
Pos[p->info] = L;
upheap(L);
}
}
}
for(i = 2; i <= N; i++)
if(d[i] == inf)
printf("0 ");
else printf("%d ",d[i]);
}
int main()
{
read();
solve();
return 0;
}