Cod sursa(job #1338504)

Utilizator CiurezAndreiCiurez Marius-Andrei CiurezAndrei Data 10 februarie 2015 08:22:12
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.16 kb
#include <fstream>
#include <vector>
#include <set>
#define dmax 20000000000
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

int n, m, i, x, y, c, D[50010],nr;
pair <int, int> a;
vector< pair <int, int> > L[50010];
multiset< pair <int, int> >H;
int main()
{
    fin >> n >> m;
    for(i = 1; i <= m; i ++)
    {
        fin >> x >> y >> c;
        L[x].push_back(make_pair(c,y));
    }
    for(i = 1; i <= n; i ++)
        D[i] = dmax;
    D[1] = 0;
    H.insert(make_pair(0, 1));
    //poz_c[++u] = D[1];
    while(nr <= n){
        if(H.empty())
            break;
        pair<int, int> st = *H.begin();
        nr ++;
        H.erase(H.begin());
        for(i = 0 ; i < L[st.second].size(); i ++)
        {
            a = L[st.second][i];
            if(D[a.second] > D[st.second] + a.first){
                H.erase(H.find(make_pair(D[a.second],a.second)));
                D[a.second] = D[st.second] + a.first;
                H.insert(make_pair(D[a.second],a.second));
            }
        }

    }
    for(i = 1; i <= n; i ++)
        if(D[i] != dmax)
            fout << D[i] << " ";
    return 0;
}