Pagini recente » Cod sursa (job #3214365) | Cod sursa (job #3182445) | Cod sursa (job #2478179) | Cod sursa (job #2580763) | Cod sursa (job #2161530)
#include <bits/stdc++.h>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int nmax=50001;
const int inf=1<<30;
int N,M,D[nmax];
bool iq[nmax];
vector < pair <int,int> > G[nmax];
struct Compare
{
bool operator ()(int x,int y)
{
return D[x]>D[y];
}
};
priority_queue < int, vector<int>, Compare> pq;
void Read()
{
f >> N >> M;
for (int i=1;i<=M;i++)
{
int x,y,c;
f >> x >> y >> c;
G[x].push_back (make_pair(y,c));
}
}
void Dijkstra (int start)
{
for (int i=1;i<=N;i++)
D[i]=inf;
D[start]=0;
pq.push(start);
iq[start]=true;
while (!pq.empty())
{
int crt=pq.top();
pq.pop();
iq[crt]=false;
for (unsigned int i=0;i<G[crt].size();i++)
{
int nb=G[crt][i].first;
int c=G[crt][i].second;
if(D[crt]+c<D[nb])
{
D[nb]=D[crt]+c;
if (iq[nb]==false)
{
pq.push(nb);
iq[nb]=true;
}
}
}
}
}
void Write()
{
for (int i=2;i<=N;i++)
if (D[i]!=inf)
g << D[i] <<" ";
else
g << "0";
}
int main()
{
Read();
Dijkstra(1);
Write();
return 0;
}