Cod sursa(job #2681312)

Utilizator DesertChuStefan Andrei DesertChu Data 5 decembrie 2020 11:32:13
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.09 kb
#include <bits/stdc++.h>
#define nmax 50001
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");

vector <pair<int,int> >v[nmax];
priority_queue <pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > >h;
int d[nmax],n,m,a,b,c,i,nod;;
bool viz[nmax];

int main()
{

    f>>n>>m;
    for(i=1; i<=m; i++)
    {
        f>>a>>b>>c;
        v[a].push_back(make_pair(c, b));
    }
    for(i=1; i<=n; i++)
    {
        d[i]=INT_MAX;
    }
    d[1]=0;
    h.push(make_pair(0, 1));
    while(!h.empty())
    {
        nod=h.top().second;
        h.pop();
        if(viz[nod]==0)
        {
            for(i=0; i<v[nod].size(); i++)
            {
                if(d[nod]+v[nod][i].first<d[ v[nod][i].second ])
                {
                    d[ v[nod][i].second ]=d[nod]+v[nod][i].first;
                    h.push(make_pair(d[v[nod][i].second], v[nod][i].second));
                }
            }
        }
        viz[nod]=1;
    }
    for(i=2; i<=n; i++)
    {
        if(d[i]==INT_MAX) g<<0<<' ';
        else g<<d[i]<<' ';
    }
}