Cod sursa(job #828306)

Utilizator mirceadinoMircea Popoveniuc mirceadino Data 3 decembrie 2012 16:45:35
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.86 kb
#include<cstdio>
#include<vector>
#include<deque>
using namespace std;
vector<int> G[100001];
deque<int> Q;
int C[100001],i,n,m,s,q,N,L,a,b;
bool B[100001];
int main()
{
    freopen("bfs.in","r",stdin);
    freopen("bfs.out","w",stdout);
    scanf("%d %d %d\n",&n,&m,&s);
    for(i=1;i<=m;i++)
    {
        scanf("%d %d",&a,&b);
        G[a].push_back(b);
    }
    Q.push_back(s); C[s]=0; B[s]=1;
    for(;!Q.empty();)
    {
        N=Q.front(); Q.pop_front();
        L=G[N].size();
        for(i=0;i<L;i++)
        {
            q=G[N][i];
            if(!B[q])
            {
                Q.push_back(q);
                B[q]=1;
                C[q]=C[N]+1;
            }
        }
    }
    for(i=1;i<=n;i++)
        if((!C[i])&&i==s) printf("0 ");
        else if(!C[i]) printf("-1 ");
        else printf("%d ",C[i]);
    return 0;
}