Cod sursa(job #2844133)

Utilizator Davla2Stancu Vlad Davla2 Data 3 februarie 2022 20:10:24
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.14 kb
#include <fstream>
#include <queue>
#include <vector>
#include <bitset>

using namespace std;

const int N=50001;
const int INF=1e9+1;

vector <pair <int, int>> succesori[N];
bitset <N> selectat;
priority_queue <pair <int, int>> h;
int d[N],n,m;

void dijkstra(int x0)
{
    for(int i=1; i<=n; i++)
    {
        d[i]=INF;
    }
    d[x0]=0;
    h.push({0, x0});
    while(!h.empty())
    {
        int x=h.top().second;
        h.pop();
        if(selectat[x]) continue;
        selectat[x]=1;
        for(auto p: succesori[x])
        {
            int y=p.first;
            int c=p.second;
            if(d[x]+c<d[y])
            {
                d[y]=d[x]+c;
                h.push({-d[y], y});
            }
        }
    }
}

int main()
{
    ifstream in("dijkstra.in");
    ofstream out("dijkstra.out");
    in>>n>>m;
    for(int i=0; i<m; i++)
    {
        int x,y,c;
        in>>x>>y>>c;
        succesori[x].push_back({y, c});
    }
    dijkstra(1);
    for (int i=2; i<=n; i++)
    {
        if(d[i]==INF)
        {
            d[i]=0;
        }
        out<<d[i]<<" ";
    }
    return 0;
}