Cod sursa(job #2391442)

Utilizator cristian51090Oanta Cristian cristian51090 Data 28 martie 2019 20:56:02
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.92 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> graf[100005];
int n,m,start,vizitat[100005];
queue <int> coada;
void citire()
{
    fin>>n>>m>>start;
    int a,b,i;
    for(i=1; i<=m; i++)
    {
        fin>>a>>b;
        graf[a].push_back(b);
    }
}
void bfs()
{
    int nodcurent=start;
    coada.push(nodcurent);
    vizitat[nodcurent]=1;
    while(!coada.empty())
    {
        nodcurent=coada.front();
        coada.pop();
        for(auto it:graf[nodcurent])
        {
            if(vizitat[it]==0){
                coada.push(it);
                vizitat[it]=vizitat[nodcurent]+1;
            }
        }
    }
}

void afisare(){
for(int i=1;i<=n;i++) fout << vizitat[i]-1 << " ";
}

int main()
{
    citire();
    bfs();
    afisare();
    return 0;
}