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Cod sursa(job #482856)
#include<fstream>
#include<vector>
#include<queue>
#define M 100005
#define pb push_back
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
typedef vector<int> VI;
VI a[M];
queue<long> q;
long viz[M],n,m,s;
void cit()
{
long i,x,y;
f>>n>>m>>s;
for(i=1;i<=m;++i)
{
f>>x>>y;
a[x].pb(y);
}
f.close();
}
void bfs()
{
long i,k;
for(i=1;i<=n;++i)
viz[i]=-1;
viz[s]=0;
q.push(s);
while(!q.empty())
{
k=q.front();
q.pop();
for(i=0;i<a[k].size();++i)
if(viz[a[k][i]]==-1) {viz[a[k][i]]=viz[k]+1;
q.push(a[k][i]);}
}
}
int main()
{
cit();
bfs();
for(long i=1;i<=n;++i)
g<<viz[i]<<" ";
g.close();
return 0;
}