Cod sursa(job #2803732)

Utilizator luciabianca2405Tudorache Lucia Bianca luciabianca2405 Data 20 noiembrie 2021 13:18:49
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.02 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
vector<pair<int,int>>g[50001];
int D[50001],oo=2000000;
int N;
priority_queue<pair<int,int>>q;
void read()
{
    int m,x,y,c;
    fin>>N>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>x>>y>>c;
        g[x].push_back(make_pair(y,c));
    }
}
int dijkstra()
{
    int Nod;
    for(int i=2; i<=N; i++)
        D[i]=oo;
    q.push({0,1});
    while(!q.empty())
    {
        Nod=q.top().second;
        q.pop();
        for(int i=0; i<g[Nod].size(); i++)
        {
            int Vecin=g[Nod][i].first,Cost=g[Nod][i].second;
            if(D[Nod]+Cost<D[Vecin])
            {
                D[Vecin]=D[Nod]+Cost;
                q.push({-D[Vecin],Vecin});
            }
        }
    }
}
void afisare()
{
    for(int i=2; i<=N; i++)
        if(D[i]==oo)
            fout<<0<<' ';
        else
            fout<<D[i]<<' ';
}
int main()
{
    read();
    dijkstra();
    afisare();
}