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Cod sursa(job #598856)
#include <fstream>
#include <queue>
#include <cstring>
#include <vector>
#define X1 100001
using namespace std;
ifstream in;
ofstream out;
vector <int> v[X1];
queue <int> q;
int use[X1],level[X1];
inline void bf(int nod)
{
for(vector <int>::iterator it=v[nod].begin();it!=v[nod].end();++it)
if(!use[*it])
{
use[*it]=1;
level[*it]=level[nod]+1;
q.push(*it);
}
if(!q.empty())
{
nod=q.front();
q.pop();
bf(nod);
}
}
int main()
{
int M,N,S,x,y;
in.open("bfs.in");
in>>N>>M>>S;
for(;M;--M)
{
in>>x>>y;
v[x].push_back(y);
}
in.close();
memset(use,0,sizeof(use));
memset(level,-1,sizeof(level));
use[S]=1;
level[S]=0;
q.push(S);
bf(S);
out.open("bfs.out");
for(int i=1;i<=N;++i) out<<level[i]<<' ';
out<<'\n';
out.close();
return 0;
}