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Cod sursa(job #855883)
#include <fstream>
#include <vector>
#include <queue>
#define Nmax 100010
using namespace std;
ifstream f("bfs.in"); ofstream g("bfs.out");
int N,M,S;
vector <int> L[Nmax];
int Viz[Nmax];
queue <int> Q;
void BFS(int nod)
{ Q.push(nod); Viz[nod]=0;
while(!Q.empty())
{ nod=Q.front(); Q.pop();
vector<int>::iterator it=L[nod].begin(), sf=L[nod].end();
for(; it!=sf; ++it)
if(Viz[*it]==-1)
{Q.push(*it); Viz[*it]=Viz[nod]+1;}
}
}
int main()
{ f>>N>>M>>S;
for(int i=1;i<=N;i++) Viz[i]=-1;
for(int x, y, i=1; i<=M; ++i)
f>>x>>y, L[x].push_back(y);
BFS(S);
for(int i=1; i<=N; ++i) g<<Viz[i]<<' ';
g<<'\n'; g.close();
return 0;
}