Cod sursa(job #2981364)

Utilizator raileanu-alin-gabrielRaileanu Alin-Gabriel raileanu-alin-gabriel Data 17 februarie 2023 20:12:17
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.14 kb
#include <fstream>
#include <set>
#include <vector>
const int NMAX=100005;

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

vector< pair< int, int> > v[NMAX];
set< pair< int, int> > s;
int dist[NMAX], n, m;
bool f[NMAX];

void dijkstra(int);

int main()
{
    int i, a, b, c;
    fin>>n>>m;
    for(i=1; i<=m; i++)
    {
        fin>>a>>b>>c;
        v[a].push_back(make_pair(b, c));
        v[b].push_back(make_pair(a, c));
    }
    for(i=1; i<=n; i++) dist[i]=1e9;
    dijkstra(1);
    for(i=2; i<=n; i++) fout<<dist[i]<<' ';
    return 0;
}

void dijkstra(int nod)
{
    pair< int, int> p;
    s.insert(make_pair(0, nod));
    dist[nod]=0;
    while(!s.empty())
    {
        p=(*s.begin());
        if(!f[p.second])
        {
            f[p.second]=true;
            for(auto i:v[p.second])
            {
                if(dist[i.first]>p.first+i.second)
                {
                    dist[i.first]=p.first+i.second;
                    s.insert(make_pair(dist[i.first], i.first));
                }
            }
        }
        s.erase(s.find(p));
    }
}