Cod sursa(job #2856644)

Utilizator SmauSmau George Robert Smau Data 24 februarie 2022 10:41:41
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.1 kb
#include <bits/stdc++.h>

#define INF 10000000

using namespace std;

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

typedef pair <int, int> iPair;

struct Neighbour {
    int node, cost;
};

vector <vector <Neighbour>> G;
vector <int> C;

int n, m;

void Dijkstra(int start) {
    vector <bool> used(n + 1, false);
    C = vector <int> (n + 1, INF);

    priority_queue <iPair, vector <iPair>, greater <iPair>> pq;
    pq.push(make_pair(start, 0));
    C[start] = 0;

    while(!pq.empty()) {
        int Node = pq.top().first;
        pq.pop();

        for(auto x : G[Node])
            if(!used[x.node] && C[x.node] > C[Node] + x.cost) {
                C[x.node] = C[Node] + x.cost;
                pq.push(make_pair(x.node, C[x.node]));
            }
    }
}

int main() {
    fin >> n >> m;
    
    G.resize(n + 1);

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

    Dijkstra(1);

    for(int i = 2; i <= n; i ++)
        fout << (C[i] != INF ? C[i] : 0) << ' ';
    
    return 0;
}