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Cod sursa(job #583337)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
vector <int> g[100003];
queue <int> q;
int n,m,s;
bool u[100003];
int dist[100003];
int main()
{
int x,y,i,nod;
ifstream in("bfs.in");
in>>n>>m>>s;
for(;m;--m)
{
in>>x>>y;
g[x].push_back(y);
}
in.close();
q.push(s);
u[s]=1;
while(!q.empty())
{
nod=q.front();
for(i=0;i<g[nod].size();++i)
if(!u[g[nod][i]])
{
q.push(g[nod][i]);
dist[g[nod][i]]=dist[nod]+1;
u[g[nod][i]]=1;
}
q.pop();
}
ofstream out("bfs.out");
for(i=1;i<=n;i++)
if(i==s)out<<0<<' ';
else
if(dist[i]>0)out<<dist[i]<<' ';
else out<<-1<<' ';
out<<'\n';
out.close();
return 0;
}