Cod sursa(job #2602385)

Utilizator tomaionutIDorando tomaionut Data 16 aprilie 2020 19:57:34
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.84 kb
#include <bits/stdc++.h>

using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,s;
vector <int> muchii[100005];
int dist[100005];
queue <int> q;
void BFS()
{
    int nod,vecin;
    q.push(s);
    while (!q.empty())
    {
        nod=q.front();
        q.pop();
        for (int i=0; i<muchii[nod].size(); i++)
        {
            vecin=muchii[nod][i];
            if (dist[vecin]==-1)
            {
            q.push(vecin);
            dist[vecin]=dist[nod]+1;
            }
        }
    }
}
int main()
{
    int i,j,x,y;
    fin >> n >> m >> s;
    for (i=1; i<=m; i++)
    {
        fin >> x >> y;
        muchii[x].push_back(y);
    }
    for (i=1; i<=n; i++)
        dist[i]=-1;
    dist[s]=0;
    BFS();
    for (i=1; i<=n; i++)
        fout << dist[i] << " ";

    return 0;
}