Cod sursa(job #2401906)

Utilizator cristina-criCristina cristina-cri Data 10 aprilie 2019 10:40:52
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.9 kb
#include <cstdio>
#include <queue>
#include <vector>

using namespace std;

int n, m, s, x, y;
int d[100005];
vector <int> v[100005];
queue <int> q;

void init()
{
    for(int i=1; i<=n; i++)
        d[i]=-1;
}

void bfs(int nod)
{
    q.push(nod);
    while(!q.empty())
    {
        int nodCurent=q.front();
        q.pop();
        for(auto vecin:v[nodCurent])
        {
            if(d[vecin] == -1)
            {
                q.push(vecin);
                d[vecin]=d[nodCurent]+1;
            }
        }
    }
}

int main()
{

    freopen("bfs.in", "r", stdin);
    freopen("bfs.out", "w", stdout);

    scanf("%d %d %d", &n, &m, &s);

    for(int i=1; i<=m; i++)
    {
        scanf("%d %d", &x, &y);
        v[x].push_back(y);
    }
    init();
    d[s]=0;

    bfs(s);

    for(int i=1; i<=n; i++)
        printf("%d ", d[i]);


    return 0;
}