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Cod sursa(job #465103)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
const char InFile[]="bfs.in";
const char OutFile[]="bfs.out";
const int MaxN = 100005;
ifstream fin(InFile);
ofstream fout(OutFile);
int N,M,S,x,y;
vector<int> a[MaxN];
int d[MaxN];
queue<int> q;
int main()
{
fin>>N>>M>>S;
for(register int i=0;i<M;++i)
{
fin>>x>>y;
a[x].push_back(y);
}
fin.close();
for(register int i=1;i<=N;++i)
{
d[i]=-1;
}
d[S]=0;
q.push(S);
while(!q.empty())
{
int nod=q.front();
q.pop();
for(register int i=0;i<(int)a[nod].size();++i)
{
if(d[a[nod][i]]==-1)
{
d[a[nod][i]]=d[nod]+1;
q.push(a[nod][i]);
}
}
}
for(register int i=1;i<=N;++i)
{
fout<<d[i]<<" ";
}
fout.close();
return 0;
}