Cod sursa(job #2922714)

Utilizator RobertlelRobert Robertlel Data 9 septembrie 2022 18:53:10
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.11 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;

ifstream f("dijkstra.in");
ofstream g("dijkstra.out");

vector<pair <int,int> >v[50006];

int inf=2e9;

int n,m,x,y,c,viz[50006],dist[50006],i;

queue<int>coada;

void dij(int x)
{
    coada.push(x);
    viz[x]=1;
    dist[x]=0;
    while(!coada.empty())
    {
        int nod=coada.front();
        coada.pop();

        for(int i=0;i<v[nod].size();i++)
        {
            int vecin=v[nod][i].first;
            int cost=v[nod][i].second;
            if(dist[nod]+cost<dist[vecin])
            {
                dist[vecin]=dist[nod]+cost;
                if(viz[vecin]==0)
                {
                   coada.push(vecin);

                }
            }
        }
    }
}

int main()
{
    f>>n>>m;
    for(i=1;i<=m;i++)
    {
        f>>x>>y>>c;
        v[x].push_back(make_pair(y,c));
    }
    for(i=1;i<=n;i++)
        dist[i]=inf;

    dij(1);
    for(i=2;i<=n;i++)
        if(dist[i]==inf)
        g<<0<<" ";
    else
        g<<dist[i]<<" ";
    return 0;
}