Cod sursa(job #522508)
#include<fstream>
#include<vector>
#include<algorithm>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
#define DIM 50001
#define INF 0x3f3f3f3f
int n, m;
vector<vector<pair<int, int> > > G;
bool s[DIM];
int sol[DIM];
void Read();
void Dijkstra();
void Write();
int main()
{
Read();
Dijkstra();
Write();
fin.close();
fout.close();
return 0;
}
void Read()
{
fin >> n >> m;
G.resize( n + 1 );
int x, y, c;
for( int i = 1; i <= m; ++i )
{
fin >> x >> y >> c;
G[x].push_back( make_pair(y, c) );
G[y].push_back( make_pair(x, c) );
}
for( int i = 1; i <= n; ++i )
sol[i] = INF;
}
void Dijkstra()
{
s[1] = true;
sol[1] = 0;
for( int i = 0; i < G[1].size(); ++i )
sol[ G[1][i].first ] = G[1][i].second;
int dmin, k;
for( int p = 1; p < n; ++p )
{
dmin = INF;
for( int i = 2; i <= n; ++i )
if( !s[i] && dmin > sol[i] )
{
dmin = sol[i];
k = i;
}
s[k] = true;
for( int i = 0; i < G[k].size(); ++i )
if( !s[ G[k][i].first ] && sol[ G[k][i].first ] > sol[k] + G[k][i].second )
sol[ G[k][i].first ] = sol[k] + G[k][i].second;
}
}
void Write()
{
for( int i = 2; i <= n; ++i )
fout << sol[i] << ' ';
}