Cod sursa(job #2755593)

Utilizator ioana0211Ioana Popa ioana0211 Data 27 mai 2021 18:45:36
Problema Algoritmul lui Dijkstra Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.09 kb
#include <iostream>
#include <iostream>
#include <vector>
#include <bits/stdc++.h>

using namespace std;
ifstream fin ("dijkstra.in");
ofstream fout ("dijkstra.out");
int n, m, a, b, c;
vector<pair<int, int>> g[50001];
int d[50001], viz[50001], t[50001];
int main()
{
    fin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>a>>b>>c;
        g[a].push_back(make_pair(b, c));
    }
    for(int i=2; i<=n; i++) d[i]=INT_MAX/2;
    viz[1]=1;
    int vf=1;
    for(int i=2; i<=n; i++)
    {
        int len=g[vf].size();
        for(int j=0; j<len; j++)
        {
            int nod=g[vf][j].first;
            int d_vf_nod=g[vf][j].second;
            if(!viz[nod] && d[nod]>d[vf]+d_vf_nod) d[nod]=d[vf]+d_vf_nod;
        }
        int Min=INT_MAX/2;
        for(int j=1; j<=n; j++){
            if(!viz[j] && Min>d[j])
                Min=d[j], vf=j;
        }
        if(Min==INT_MAX) break;
        viz[vf]=1;
    }
    for(int i=2; i<=n; i++){
        if(d[i]==INT_MAX/2)
            fout<<0<<" ";
        else
            fout<<d[i]<<" ";
    }
    return 0;
}