Cod sursa(job #2148177)

Utilizator UnseenMarksmanDavid Catalin UnseenMarksman Data 1 martie 2018 16:10:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.86 kb
#include <cstdio>
#include <vector>
#define N 100002

using namespace std;

int n, m, nod, k, d[N], v[N];
vector<int> A[N];

void bfs(int x)
{
    int i,j;

    for(int i=1; i<=n; i++)
        d[i]=-1;

    k=1;
    d[nod]=0;
    v[k]=nod;

    for(i=1; i<=k; i++)
    {
        for(j=0; j<A[v[i]].size(); j++)
        {
            if(d[A[v[i]][j]] == -1)
            {
                v[++k]=A[v[i]][j];
                d[v[k]]=d[v[i]]+1;
            }
        }
    }
}

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

    int i,j;

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

    while(m)
    {
        scanf("%d%d", &i, &j);
        A[i].push_back(j);
        m--;
    }

    bfs(nod);

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

    return 0;
}