Cod sursa(job #2698449)

Utilizator razviOKPopan Razvan Calin razviOK Data 22 ianuarie 2021 10:14:03
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.95 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");

queue <int> Coada;
vector <pair<int,int> > G[105];
const int inf=2e9;
long long x,y,n,p,cost,D[105];
void Dijkstra()
{
    while(!Coada.empty())
    {
        int nod=Coada.front();
        Coada.pop();

        for(vector<pair<int,int> >::iterator it=G[nod].begin(); it!=G[nod].end(); ++it)
            if(D[nod]+it->second<D[it->first])
            {
                D[it->first]=D[nod]+it->second;
                Coada.push(it->first);
            }
    }
}
int main()
{
    f>>n>>p;
    while(f>>x>>y>>cost)
        G[x].push_back({y,cost});

    for(int i=1; i<=n; i++)
        D[i]=inf;
    D[p]=0;
    Coada.push(p);
    Dijkstra();

    for(int i=1; i<=n; i++)
    {
        if(D[i]==inf)
            g<<-1<<" ";
        else g<<D[i]<<" ";
    }
    return 0;
}