Cod sursa(job #1380052)

Utilizator StefanMudragMudrag Stefan StefanMudrag Data 6 martie 2015 21:27:57
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.11 kb
#include<iostream>
#include<fstream>
#define NMAX 50002
#include<vector>
#include<utility>
#include<set>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int n,m,dmin[NMAX];
vector<pair<int,int> >g[NMAX];
set<pair<int,int> >st;
void read()
{
    fin>>n>>m;
    int x,y,c;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        g[x].push_back(make_pair(y,c));
    }
    fin.close();
}
void dijkstra()
{
    for(int i=1;i<=n;i++)dmin[i]=100000;
    dmin[1]=0;
    int nod;

    st.insert(make_pair(0,1));
    while(!st.empty())
    {
        nod=st.begin()->second;
        st.erase(st.begin());
        for(int i=0;i<g[nod].size();++i)


            if(dmin[g[nod][i].first]>dmin[nod]+g[nod][i].second)
        {


            dmin[g[nod][i].first]=dmin[nod]+g[nod][i].second;

            st.insert(make_pair(dmin[g[nod][i].first],g[nod][i].first));

        }
    }

    for(int i=2;i<=n;i++)
        if(dmin[i]==100000)fout<<0<<" ";
    else fout<<dmin[i]<< " ";
}
int main()
{
    read();
    dijkstra();
    fout.close();
    return 0;
}