Cod sursa(job #2676077)

Utilizator kitkat007Graphy kitkat007 Data 23 noiembrie 2020 14:31:06
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <map>
#include <vector>
#include <queue>
using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

const int MAX_NODES_COUNT = 100013;

vector<int> adjList[MAX_NODES_COUNT];
queue<int> q;
int n, m, s, x, y;
int dist[MAX_NODES_COUNT];

int main()
{
    fin >> n >> m >> s;
    while (m--)
    {
        fin >> x >> y;
        adjList[x].push_back(y);
    }
    q.push(s);
    fill(dist, dist + n + 1, -1);
    dist[s] = 0;
    while (!q.empty())
    {
        int currNode = q.front();
        q.pop();
        for (int node : adjList[currNode])
        {
            if (dist[node] == -1)
            {
                dist[node] = dist[currNode] + 1;
                q.push(node);
            }
        }
    }
    for (int i = 1; i <= n; ++i)
    {
        fout << dist[i] << " ";
    }
    fout.flush();
}