Cod sursa(job #2450784)

Utilizator cpopescu1Popescu Cristian cpopescu1 Data 24 august 2019 16:13:05
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.52 kb
#include<bits/stdc++.h>
#define maxn 50005
using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

const int INF=INT_MAX-1;

int N, M;
int D[maxn];
bool InCoada[maxn];

vector <pair <int,int> > G[maxn];

struct compara
{
    bool operator()(int x,int y)
    {
        return D[x]>D[y];
    }
};

priority_queue<int, vector<int>, compara> Coada;

void citire()
{
    fin>>N>>M;
    for(int i=1;i<=M;i++)
    {
        int x,y,c;
        fin>>x>>y>>c;
        G[x].push_back(make_pair(y,c));
    }
}

void Dijkstra(int nodStart)
{
    for(int i=1;i<=N;i++)
        D[i]=INF;

    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[nodCurent]+Cost< D[Vecin])
            {
                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]!=INF)
            fout<<D[i]<<" ";
        else
            fout<<0<<" ";
    }
}

int main()
{
    citire();
    Dijkstra(1);
    afisare();
    return 0;
}