Cod sursa(job #3310198)

Utilizator alexdraguAlexandru Dragu alexdragu Data 12 septembrie 2025 08:24:16
Problema Algoritmul lui Dijkstra Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.96 kb
#include <fstream>
#include <vector>
#include <set>
using namespace std;
ifstream cin("dijkstra.in");
ofstream cout("dijkstra.out");
const int inf=1e9;
int n,m,i,x,y,cost,nod,d[50005],vec;
vector<pair<int,int>> v[50005];
set<pair<int,int>> s;
int main()
{
    cin>>n>>m;
    for(i=1;i<=n;i++) d[i]=inf;
    for(i=1;i<=m;i++)
    {
        cin>>x>>y>>cost;
        v[x].push_back({y,cost});
    }
    d[1]=0;
    s.insert({0,1});
    while(!s.empty())
    {
        nod=s.begin()->second;
        s.erase(s.begin());
        for(i=0;i<v[nod].size();i++)
        {
            vec=v[nod][i].first;
            cost=v[nod][i].second;
            if(d[nod]+cost<d[vec])
            {
                s.erase({d[vec],vec});
                d[vec]=d[nod]+cost;
                s.insert({d[vec],vec});
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        if(d[i]==inf) cout<<-1<<' ';
        else cout<<d[i]<<' ';
    }
    return 0;
}