Cod sursa(job #2763139)

Utilizator SabailaCalinSabaila Calin SabailaCalin Data 11 iulie 2021 19:44:07
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.49 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

ifstream f ("bfs.in");
ofstream g ("bfs.out");

vector< int > Vector[100005];
queue< int > Coada;
int n, m, start;
int distanta[100005];

void BFS()
{
    int nod, vecin;
    Coada.push(start);
    while (Coada.empty() == false)
    {
        nod = Coada.front();
        for (int i = 0; i < Vector[nod].size(); i++)
        {
            vecin = Vector[nod][i];
            if (distanta[vecin] == -1)
            {
                Coada.push(vecin);
                distanta[vecin] = distanta[nod] + 1;
            }
        }
        Coada.pop();
    }
}

int main()
{
    f >> n >> m >> start;
    for (int i = 1; i <= m; i++)
    {
        f x, y;
        cin >> x >> y;
        Vector[x].push_back(y);
    }

//    for (int i = 1; i <= n; i++)
//    {
//        cout << "Node " << i << ": ";
//        for (int j = 0; j < Vector[i].size(); j++)
//        {
//            if (j == Vector[i].size() - 1)
//            {
//                cout << Vector[i][j] << endl;
//            }
//            else
//            {
//                cout << Vector[i][j] << " ";
//            }
//        }
//    }

    for (int i = 1; i <= n; i++)
    {
        distanta[i] = -1;
    }
    distanta[start] = 0;

    BFS();

    for (int i = 1; i <= n; i++)
    {
        g << distanta[i] << " ";
    }
}

//5 7 2
//1 2
//2 1
//2 2
//3 2
//2 5
//5 3
//4 5