Cod sursa(job #2885353)

Utilizator cristina-criCristina cristina-cri Data 5 aprilie 2022 20:44:14
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.27 kb

#include <fstream>
#include <vector>
#include <set>
#define  MAXIM 0x3f3f3f3f

using namespace std;

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

struct varf{
    int vecin, cost;
    bool operator<(const varf& other) const{
        if(cost != other.cost)
            return cost < other.cost;
        return  vecin < other.vecin;
    }
};


set <varf> s;
vector <varf> graph[50005];

int x, y, c, n, m, dmin[50005], pusInCoada[50005], nrActualizari[50005];

void parcurge()
{
    while(!s.empty())
    {
        auto top=s.begin()->vecin;
        s.erase(s.begin());
        for(const auto &v:graph[top])
        {
            int nc=dmin[top]+v.cost;
            if(dmin[v.vecin] > nc)
            {
                if(dmin[v.vecin] != MAXIM)
                    s.erase({v.vecin, dmin[v.vecin]});
                dmin[v.vecin] = nc;
                s.insert({v.vecin, dmin[v.vecin]});
            }
        }
    }
}

int pune(int x)
{
    if(x == MAXIM)
        return 0;
    else
        return x;
}

int main()
{
    f>>n>>m;

    for(int i=1; i<=m; i++)
    {
        f>>x>>y>>c;
        graph[x].push_back({y, c});
    }
    for(int i=2; i<=n; i++)
        dmin[i]=MAXIM;
    s.insert({1, 0});
    parcurge();
    for(int  i=2; i<=n; i++)
        g<<pune(dmin[i])<<' ';
    return 0;
}