Cod sursa(job #2926558)

Utilizator Samoila_AlexandruSamoilaAlexandru Samoila_Alexandru Data 17 octombrie 2022 23:10:13
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.22 kb
#include <fstream>
#include <vector>
#include <queue>
#define inf 0x3f3f3f3f

using namespace std;

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

using pereche=pair<int, int>;

const int dim=5e4+5;

vector<pereche> g[dim];

int n, m, x, y, c, d[dim];

void dijkstra()
{
    priority_queue<pereche, vector<pereche>, greater<pereche>> pq;

    for(int i=2; i<=n; i++)
        d[i]=inf;

    d[1]=0;
    pq.push({d[1], 1});
    while(!pq.empty())
    {
        int cost=pq.top().first;
        int nod=pq.top().second;

        if(d[nod]!=cost)
            continue;

        pq.pop();

        for(auto& i: g[nod])
        {
            int nodNou=i.first;
            int costNou=i.second;

            if(d[nodNou]>d[nod]+costNou)
            {
                d[nodNou]=d[nod]+costNou;
                pq.push({d[nodNou], nodNou});
            }
        }
    }
}

int main()
{
    fin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>x>>y>>c;
        g[x].push_back({y, c});
    }

    fin.close();

    dijkstra();

    for(int i=2; i<=n; i++)
        if(d[i]!=inf)
        fout<<d[i]<<' ';
        else fout<<0<<' ';

    fout.close();

    return 0;
}