Pagini recente » Cod sursa (job #3032794) | Cod sursa (job #847684) | Cod sursa (job #3271063) | Cod sursa (job #549002) | Cod sursa (job #2955161)
#include <fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,s,x,y;
int d[100001];
queue<int>q;
vector<int>v[100001];
bool viz[100001];
void bfs(int nod)
{
viz[nod]=1;
q.push(nod);
while(!q.empty())
{
nod=q.front();
q.pop();
for(int i=0;i<v[nod].size();i++)
{
int nod1=v[nod][i];
if(viz[nod1]==0)
{
viz[nod1]=1;
d[nod1]=d[nod]+1;
q.push(nod1);
}
}
}
}
int main()
{
fin>>n>>m>>s;
for(int i=1;i<=m;i++)
{
fin>>x>>y;
v[x].push_back(y);
}
d[s]=0;
bfs(s);
for(int i=1;i<=n;i++)
{
if(i!=s&&d[i]==0)
fout<<-1<<" ";
else
fout<<d[i]<<" ";
}
return 0;
}