Cod sursa(job #398178)

Utilizator PavelRazvanPavel Razvan PavelRazvan Data 18 februarie 2010 08:54:54
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 1.21 kb
#include<algorithm>
using namespace std;
#include<vector>
#include<queue>

#define DIM 50005

int n,d[DIM];
vector <pair <int,int> > lst[DIM];
struct cmp
{
    bool operator() (const int &a, const int &b) const
    {
        return d[a]>d[b];
    }
}; priority_queue <int, vector <int>,cmp> c;

void read ()
{
    int i,x,y,c,m;
    scanf("%d%d",&n,&m);
    for(i=2;i<=n;++i)
        d[i]=1<<30;
    for(i=1;i<=m;++i)
    {
        scanf("%d%d%d",&x,&y,&c);
        lst[x].push_back (make_pair (y,c));
    }
}
void solve ()
{
    int aux,i,j;
    c.push (1);
    while (!c.empty ())
    {
        aux=c.top ();
        c.pop ();
        for(j=0;j<lst[aux].size ();++j) 
            if(d[aux]+lst[aux][j].second<d[lst[aux][j].first])
            {
                d[lst[aux][j].first]=d[aux]+lst[aux][j].second;
                c.push (lst[aux][j].first);
      
        }
    }
}
void show ()
{
    int i;
    for(i=2;i<=n;++i)
        if(d[i]==1<<30)
            printf("0 ");
        else
            printf("%d ",d[i]);
}
int main ()
{
    freopen ("dijkstra.in","r",stdin);
    freopen ("dijkstra.out","w",stdout);
    read ();
    solve ();
    show ();
    return 0;
}