Cod sursa(job #2858597)

Utilizator TanasaStefanTanasa Stefan TanasaStefan Data 27 februarie 2022 22:23:32
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb

#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int n, m;

vector < pair < int, int > > v[50005];

queue < int > q;

int best[50005];

bool inq[50005];

const int inf = 2e9;

void Dijkstra (int start)
{
    q.push(start);
    inq[start] = 1;

    while (!q.empty())
    {
        int nod = q.front();
        q.pop();
        inq[nod]=0;
        // lg = v[nod].size();
        for (int i=0; i<v[nod].size(); i++)
        {
            int vecin = v[nod][i].first;
            int cost = v[nod][i].second;

            if (best[nod] + cost < best[vecin])
            {
                best[vecin] = best[nod] + cost;

                if (!inq[vecin])
                {
                    q.push(vecin);
                    inq[vecin] = 1;
                }
            }
        }
    }
}

int main()
{
    f >> n >> m;
    int x ,y ,c;
    for(int i=1;i<=m;i++)
    {
        f>>x>>y>>c;
        v[x].push_back(make_pair(y, c));
        v[y].push_back(make_pair(x,c));
    }
    for (int i=1; i<=n; i++)
        best[i] = inf;
    best[1] = 0;
    Dijkstra(1);
        for(int i=2;i<=n;i++)
            if(best[i]==inf)
            g<<0<<" ";
        else
            g<<best[i]<<" ";
    return 0;
}