Cod sursa(job #2650743)

Utilizator patriciaxdBraica Patricia patriciaxd Data 19 septembrie 2020 22:18:40
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.45 kb
#include<bits/stdc++.h>

using namespace std;
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
int D[50005];
vector < pair <int, int> >G[50005];
int oo=(1<<30);
bool Incoada[50005];
int N,M;
struct compara
{
    bool operator()(int x,int y)
    {
        return D[x]>D[y];
    }
};
priority_queue<int, vector <int>,compara> Coada;
void Citire()
{
    in>>N>>M;
    for(int i=1; i<=M; i++)
    {
        int x,y,c;
        in>>x>>y>>c;
        G[x].push_back(make_pair(y,c));
    }
}
void Dijsktra(int nodstart)
{
    for(int i=1; i<=N; i++)
        D[i]=oo;
    D[nodstart]=0;
    Coada.push(nodstart);
    Incoada[nodstart]=true;
    while(!Coada.empty())
    {
        int nodcurent=Coada.top();
        Coada.pop();
        Incoada[nodcurent]=false;
        for(size_t i=0; i<G[nodcurent].size(); i++)
        {
            int Vecin=G[nodcurent][i].first;
            int Cost=G[nodcurent][i].second;
            if(D[Vecin]>D[nodcurent]+Cost)
            {
                D[Vecin]=D[nodcurent]+Cost;
                if(Incoada[Vecin]==false)
                {
                    Coada.push(Vecin);
                    Incoada[Vecin]=true;
                }
            }
        }
    }
}
void Afisare()
{
    for(int i=2; i<=N; i++)
        if(D[i]!=oo)
            out<<D[i]<<' ';
        else
            out<<"0 ";
}
int main()
{
    Citire();
    Dijsktra(1);
    Afisare();

    return 0;
}