Cod sursa(job #2711035)

Utilizator Edyci123Bicu Codrut Eduard Edyci123 Data 23 februarie 2021 16:56:39
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.13 kb
#include <bits/stdc++.h>
#define NMAX 50005
#define INF 0x3f3f3f3f

using namespace std;

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

int n, m;
int drum[NMAX];
vector <pair <int, int>> Muchii[NMAX];
priority_queue <pair <int, int>> q;

void dijkstra()
{
    while(!q.empty())
    {
        pair <int, int> poz = q.top();
        q.pop();
        for(auto k : Muchii[poz.first])
            if(drum[k.first] > k.second + drum[poz.first])
            {
                drum[k.first] = k.second + drum[poz.first];
                q.push(make_pair(k.first, k.second + drum[poz.first]));
            }
    }
}

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

    for(int i = 1; i <= n; i++)
        drum[i] = INF;
    q.push(make_pair(1, 0));
    drum[1] = 0;
    dijkstra();

    for(int i = 2; i <= n; i++, g << " ")
        if(drum[i] == INF)
            g << 0;
        else
            g << drum[i];
    return 0;
}