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Cod sursa(job #900719)
#include<fstream>
#include<vector>
#include<set>
#include<utility>
#define NMAX 50010
#define INF 50010000
#define f first
#define s second
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
vector<pair<int, int> > a[NMAX];
multiset<pair<int, int> > s;
int n, m, d[NMAX], vz[NMAX];
void Citeste()
{
int x, y, c, i;
f>>n>>m;
for (i=1; i<=m; ++i)
{
f>>x>>y>>c;
a[x].push_back(make_pair(y, c));
}
}
void Solve()
{
int i, gata=0, nr=0;
pair<int, int> pr, r;
multiset<pair<int, int> > :: iterator is;
for (i=1; i<=n; ++i) d[i]=INF;
s.insert(make_pair(0, 1)); d[1]=0;
do
{
do
{
is=s.begin();
pr=*is;
if (vz[pr.s]) s.erase(*is);
}while (vz[pr.s]==1 && !s.empty());
if (!s.empty())
{
s.erase(is);
vz[pr.s]=1; ++nr;
for (i=0; i<a[pr.s].size(); ++i)
{
r=a[pr.s][i];
if (!vz[r.f] && d[r.f]>d[pr.s]+r.s)
{
d[r.f]=d[pr.s]+r.s;
s.insert(make_pair(d[r.f], r.f));
}
}
}
else gata=1;
}while(!gata && nr<n-1);
for (i=2; i<=n; ++i)
if (d[i]==INF) g<<"0 ";
else g<<d[i]<<" ";
}
int main()
{
Citeste();
Solve();
f.close();
g.close();
return 0;
}