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Cod sursa(job #282056)
#include<fstream>
#include<vector>
#include<queue>
#define MaxN 100001
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector<int> a[MaxN];
vector<int>::iterator it;
queue<int> qu;
int n,m,s,x,y,i,c[MaxN];
void bfs(int nod)
{ qu.push(nod);
c[nod]=0;
while(!qu.empty())
{ x=qu.front();
for(it=a[x].begin();it!=a[x].end();++it)
if(c[*it]==-1)
{ c[*it]=c[x]+1;
qu.push(*it);
}
qu.pop();
}
}
int main()
{ fin>>n>>m>>s;
for(i=1;i<=m;i++)
{ fin>>x>>y;
a[x].push_back(y);
}
for(i=1;i<=n;i++) c[i]=-1;
bfs(s);
for(i=1;i<=n;i++)
fout<<c[i]<<' ';
return 0;
}