Cod sursa(job #2854951)

Utilizator AswVwsACamburu Luca AswVwsA Data 21 februarie 2022 21:14:07
Problema Algoritmul lui Dijkstra Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.17 kb
#include <fstream>
#include <climits>
#include <queue>
//#include <iostream>
using namespace std;

ifstream cin("dijkstra.in");
ofstream cout("dijkstra.out");

const int NMAX = 50003;
vector <pair <int, int> > v[NMAX];
int d[NMAX];

class comp
{
public :
    bool operator ()(pair <int, int> a, pair <int, int> b) const
    {
        return a.second < b.second;
    }
};
priority_queue <pair <int, int>, vector <pair <int, int> >, comp> q;
int main()
{
    int n, m, i;
    cin >> n >> m;
    while (m--)
    {
        int a, b, c;
        cin >> a >> b >> c;
        v[a].push_back({b, c});
    }
    for (i = 1; i <= n; i++)
        d[i] = INT_MAX;
    q.push({1, 0});
    d[1] = 0;
    while (!q.empty())
    {
        int f = q.top().first;
        q.pop();
        for (int i = 0; i < v[f].size(); i++)
            if (d[f] + v[f][i].second < d[v[f][i].first])
            {
                d[v[f][i].first] = d[f] + v[f][i].second;
                q.push({v[f][i].first, d[v[f][i].first]});
            }
    }
    for (i = 2; i <= n; i++)
    {
        if (d[i] == INT_MAX)
            d[i] = 0;
        cout << d[i] << " ";
    }
}