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Cod sursa(job #800009)
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int i,j,n,m,s,x,y,d[100010],viz[100010];
vector<int> a[100010];
queue<int> q;
void det()
{
int i,x;
q.push(s);
d[s]=0;
while(!q.empty())
{
x=q.front();
for(i=0;i<a[x].size();++i)
if(!viz[a[x][i]]&&d[a[x][i]]>d[x]+1)
{
viz[a[x][i]]=1;
d[a[x][i]]=d[x]+1;
q.push(a[x][i]);
}
q.pop();
}
}
int main()
{
f>>n>>m>>s;
for(i=1;i<=n;++i)
d[i]=100000001,viz[i]=0;
for(i=1;i<=m;++i)
{
f>>x>>y;
a[x].push_back(y);
}
det();
for(i=1;i<=n;++i)
if(d[i]==100000001)
g<<-1<<" ";
else
g<<d[i]<<" ";
return 0;
}