Cod sursa(job #2870153)

Utilizator Seress26Seres Artur Seress26 Data 12 martie 2022 10:09:39
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.05 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#include <limits.h>
#define INF INT_MAX
#define NMAX 1000001
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int n,m,s,a,b,D[NMAX];
vector <int> G[NMAX];
queue <int> q;
void Citire()
{
    f>>n;
    f>>m;
    f>>s;
    for(int i=1;i<=m;i++)
    {
        f>>a;
        f>>b;
        G[a].push_back(b);
    }
}
void Rezolvare(int Start)
{
    int Curent,Vecin;
    D[Start]=1;
    q.push(Start);
    while(!q.empty())
    {
        Curent=q.front();
        q.pop();
        for(size_t i=0;i<G[Curent].size();i++)
        {
            Vecin=G[Curent][i];
            if(D[Vecin]==0)
            {
                D[Vecin]=D[Curent]+1;
                q.push(Vecin);
            }
        }
    }
}
void Afisare()
{
    for(int i=1;i<=n;i++)
    {
        if(D[i]!=INF)
            g<<D[i]-1<<' ';
        else
            g<<-1<<' ';
    }
}
int main()
{
    Citire();
    Rezolvare(s);
    Afisare();

    return 0;
}