Cod sursa(job #889661)

Utilizator ionutpPala Ionut ionutp Data 24 februarie 2013 17:21:10
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 1.38 kb
#include<fstream>
using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

int A[200][200], T[100], S[100], D[100], n, m, c, x, y, poz, inf = 999, r, minn;

void drum(int i)
{
    if(T[i])
    drum(T[i]);
    fout << i << " ";
}
void Read()
{
    fin >> n >> m;
    r = 1;
    for(int i = 1; i <= m; i++)
    {
        fin >> x >> y >> c;
        A[x][y] = c;
    }
    for(int i = 1; i <= n; i++)
    for(int j = 1; j <= n; j++)
    if(i != j && A[i][j] == 0)
    A[i][j] = inf;
    S[r] = 1;
    for(int i = 1; i <= n; i++)
    {
        D[i] = A[r][i];
        if(i != r)
        if(D[i] < inf)
        T[i] = r;
    }

}
void Dijkstra()
{
    for(int i = 1; i <= n - 1; i++)
    {
        minn = inf;
        for(int j = 1; j <= n; j++)
         if(S[j] == 0)
         {
             if(D[j] < minn)
             {
                 minn = D[j];
                 poz = j;
             }
         }
         S[poz] = 1;
         for(int k = 1; k <= n; k++)
         {
             if(S[k] == 0)
             if(D[k] > D[poz] + A[poz][k])
             {
                 D[k] = D[poz] + A[poz][k];
                 T[k] = poz;
             }
         }
    }
}
int main()
{
    Read();
    Dijkstra();
    for(int i = 2; i <= n; i++)
    fout << D[i] << " ";
    fin.close();
    fout.close();
    return 0;

}