Cod sursa(job #2264986)

Utilizator filicriFilip Crisan filicri Data 20 octombrie 2018 14:26:45
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.04 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#define lim 250000
#define inf 5000000000
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
priority_queue <pair <int,int> > pq;
vector <pair <int,int> > muc[lim];
int n,m,a,b,c;
long long dist[lim];
bool viz[lim];
int main()
{
    f>>n>>m;
    for (int i=1;i<=m;i++)
    {
        f>>a>>b>>c;
        muc[a].push_back({(-1)*c,b});
    }
    for (int i=2;i<=n;i++) dist[i]=inf;
    pq.push({0,1});
    while (!pq.empty())
    {
        int nod=pq.top().second;
        pq.pop();
        if (viz[nod]) continue;
        viz[nod]=1;
        for (auto vec:muc[nod])
        {
            if (dist[nod]-vec.first<dist[vec.second])
            {
                dist[vec.second]=dist[nod]-vec.first;
                pq.push({-dist[vec.second],vec.second});
            }
        }
    }
    for (int i=2;i<=n;i++)
        if (dist[i]==inf) g<<0<<" ";
        else g<<dist[i]<<" ";
    f.close();
    g.close();
    return 0;
}