Pagini recente » Cod sursa (job #1091451) | Cod sursa (job #1347768) | Cod sursa (job #29213) | Cod sursa (job #438755) | Cod sursa (job #2193818)
#include <fstream>
#include <vector>
#include <algorithm>
#include <queue>
using namespace std;
const int NMAX=1000000;
vector<int>G[NMAX+5],d;
vector<bool>viz;
queue<int>q;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n;
void bfs(int u)
{
int v,j;
viz.assign(n+1,0);
d.assign(n+1,0);
q.push(u);
viz[u]=1;
while(!q.empty())
{
u=q.front();
q.pop();
for(j=0;j<G[u].size();j++)
{
v=G[u][j];
if(viz[v]==0)
{
viz[v]=1;
d[v]=d[u]+1;
q.push(v);
}
}
}
}
int main()
{
int m,s,u,v,i;
fin>>n>>m>>s;
for(i=1;i<=m;i++)
{
fin>>u>>v;
G[u].push_back(v);
}
bfs(s);
for(i=1;i<=n;i++)
if(d[i]==0 && i!=s)
d[i]=-1;
for(i=1;i<=n;i++)
fout<<d[i]<<" ";
return 0;
}