Cod sursa(job #2931023)

Utilizator raileanu-alin-gabrielRaileanu Alin-Gabriel raileanu-alin-gabriel Data 30 octombrie 2022 11:24:11
Problema Algoritmul lui Dijkstra Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.99 kb
#include <fstream>
#include <set>
#include <vector>

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

set <pair<int, int>> s;
vector <pair<int, int>> v[50005];
int d[50005], n, m;
bool f[50005];
void dijkstra(int);

int main()
{
  int i, a, b, c;
  fin>>n>>m;
  for(i=2; i<=n; i++)
  {
    d[i]=1e9+10;
  }
  for(i=1; i<=m; i++)
  {
    fin>>a>>b>>c;
    v[a].push_back({b, c});
  }
  dijkstra(1);
  return 0;
}

void dijkstra(int nod)
{
  int nr=1;
  pair <int, int> p;
  s.insert({0, nod});
  while(nr<n)
  {
    p=*(s.begin());
    if(f[p.second]==false)
    {
      nr++;
      f[p.second]==true;
      for(auto i:v[p.second])
      {
        if(p.first+i.second<d[i.first])
        {
          d[i.first]=p.first+i.second;
          s.insert({d[i.first], i.first});
        }
      }
    }
    s.erase(p);
  }
  for(int t=2; t<=n; t++)
  {
    if(d[t]==1e9+10) d[t]=0;
    fout<<d[t]<<' ';
  }
  fout<<'\n';
}