Cod sursa(job #1810489)

Utilizator MirceaTMircea Timpuriu MirceaT Data 20 noiembrie 2016 08:30:19
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.89 kb
#include <cstdio>
#include <vector>
#include <queue>

using namespace std;

vector<int> v[100010];
int d[100010];
char vaz[100010];

void bfs(int nod)
{
    queue<int> q;
    q.push(nod);
    vaz[nod]=1;
    d[nod]=0;
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(int i=0;i<v[nod].size();i++)
            if(!vaz[v[nod][i]])
            {
                d[v[nod][i]]=d[nod]+1;
                vaz[v[nod][i]]=1;
                q.push(v[nod][i]);
            }
    }
}

int main()
{
    freopen("bfs.in", "r", stdin);
    freopen("bfs.out", "w", stdout);
    int n,m,nod,x,y;
    scanf("%d%d%d",&n,&m,&nod);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d",&x,&y);
        v[x].push_back(y);
    }
    bfs(nod);
    for(int i=1;i<=n;i++)
        if(!vaz[i]) printf("-1 ");
        else printf("%d ",d[i]);
    return 0;
}