Cod sursa(job #2643561)

Utilizator Guccifer2429Julien Iancu Guccifer2429 Data 20 august 2020 14:07:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.03 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,start;
const int nlim=100005;
vector <int> muchii[nlim];
queue <int> coada;
int distanta[nlim];
void bfs()
{
    int nod,vecin;
    while(!coada.empty())
    {
        nod=coada.front();
        coada.pop();
        for(unsigned int i=0; i<muchii[nod].size(); i++)
        {
            vecin=muchii[nod][i];
            if(distanta[vecin] == -1)
            {
                coada.push(vecin);
                distanta[vecin]=1+distanta[nod];
            }
        }
    }
}
void citire()
{
    fin>>n>>m>>start;
    for(int i=1; i<=m; i++)
    {
        int x,y;
        fin>>x>>y;
        muchii[x].push_back(y);
    }
    for(int i=1; i<=n; i++)
    {
        distanta[i]=-1;
    }
    distanta[start]=0;
    coada.push(start);
    bfs();
    for(int i=1; i<=n; i++)
    {
        fout<<distanta[i]<<' ';
    }
}
int main()
{
    citire();
}