Cod sursa(job #1374460)

Utilizator paulhelmerPaul Helmer paulhelmer Data 5 martie 2015 09:26:49
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.14 kb
#include<iostream>
#include<fstream>
#include<utility>
#include<vector>
#define NMAX 50001
#include<set>
#define inf 100000
#include<cstring>

using namespace std;

ifstream f("dijkstra.in");
ofstream g("dijkstra.out");

int n,m,dmin[NMAX],nod;

vector<pair<int,int> > lista[NMAX];
set<pair<int,int> > st;

void read()
{
    f >> n >> m;
    int x, y, c;
    for(int i=1;i<=m;i++)
    {
        f >> x >> y >>c;
        lista[x].push_back(make_pair(y,c));

    }
}
int main()
{
    read();
    for(int i=1;i<=n;i++) dmin[i]=inf;
    dmin[1]=0;

    st.insert(make_pair(0,1));

    while(!st.empty())
    {
        nod=st.begin()->second;
        st.erase(st.begin());

        for(int i=0;i<lista[nod].size();++i)
        {
            if(dmin[lista[nod][i].first]>dmin[nod]+lista[nod][i].second)
            {
                dmin[lista[nod][i].first]=dmin[nod]+lista[nod][i].second;
                st.insert(make_pair(dmin[lista[nod][i].first],lista[nod][i].first));
            }
        }
    }

    for(int i=2;i<=n;i++)
        if(dmin[i]==inf) g<<0<<" ";
        else g <<dmin[i]<<" ";

    return 0;
}