Cod sursa(job #2803534)

Utilizator luciabianca2405Tudorache Lucia Bianca luciabianca2405 Data 20 noiembrie 2021 10:33:20
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.26 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
vector<pair<int,int>>g[50001];
int D[50001],oo=2000000;
vector<bool>Use;
int N;
void read()
{
    int m,x,y,c;
    fin>>N>>m;
    Use=vector<bool>(N+1);
    for(int i=1; i<=m; i++)
    {
        fin>>x>>y>>c;
        g[x].push_back(make_pair(y,c));
    }
}
struct compara
{
    bool operator()(int x,int y)
    {
        return D[x]>D[y];
    }
};
priority_queue<int, vector<int>, compara>q;
void dijkstra()
{
    int Nod;
    for(int i = 1; i <= N; i++)
        D[i] = oo;
    D[1]=0;
    q.push(1);
    Use[1]=true;
    while(!q.empty())
    {
        Nod=q.top();
        q.pop();
        Use[Nod]=false;
        for(int i=0; i<g[Nod].size(); i++)
        {
            int Vecin=g[Nod][i].first,Cost=g[Nod][i].second;
            if(D[Nod]+Cost<D[Vecin])
            {
                D[Vecin]=D[Nod]+Cost;
                if(!Use[Vecin])
                    Use[Vecin]=true,q.push(Vecin);
            }
        }

    }
}
void afisare()
{
    for(int i=2; i<=N; i++)
        if(D[i]==oo)
            fout<<0<<' ';
        else
            fout<<D[i]<<' ';
}
int main()
{
    read();
    dijkstra();
    afisare();
}