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Cod sursa(job #565871)
#include<stdio.h>
#include<queue>
#include<vector>
using namespace std;
const int N=50715;
const int INF=900000000;
struct pereche
{
int nod,cost;
};
vector<pereche> a[N];
priority_queue<pair<int,int> > h;
int n,d[N];
bool s[N];
void citire()
{
int m,i,x,y,c;
scanf("%d%d",&n,&m);
for(i=1;i<=m;i++)
{
scanf("%d%d%d",&x,&y,&c);
a[x].push_back((pereche){y,c});
}
}
void initializare()
{
for(int i=0;i<=n;i++)
d[i]=INF;
}
void actualizare(int x)
{
int c,y;
for(size_t i=0 ; i<a[x].size() ; i++)
{
y=a[x][i].nod;
c=a[x][i].cost;
if(d[x]+c<d[y])
{
d[y]=d[x]+c;
h.push(make_pair(-d[y],y));
}
}
}
int vfcostmin()
{
while(!h.empty())
{
if(!s[h.top().second])
return h.top().second;
h.pop();
}
return 0;
}
void dijkstra(int x0)
{
int x;
d[x0] = 0;
h.push(make_pair(d[x0],x0));
for(int i=1 ; i<n ; i++)
{
x = vfcostmin();
if(d[x] == INF)
return;
s[x] = true;
actualizare(x);
}
}
void afisare()
{
int i;
for(i=2;i<=n;i++)
if(d[i]==INF)
printf("0 ");
else
printf("%d ", d[i]);
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
citire();
initializare();
dijkstra(1);
afisare();
return 0;
}