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Cod sursa(job #730733)
# include <fstream>
# include <list>
# include <queue>
# include <vector>
using namespace std;
ifstream f ("bfs.in");
ofstream g ("bfs.out");
int i,n,m,s,x,y;
int main ()
{
f>>n>>m>>s;
list<int> a[n+1];
vector<int> d(n+1,-1);
for (i=1;i<=m;i++)
{
f>>x>>y;
a[x].push_front(y);
}
queue<int> coada;
coada.push(s);
d[s]=0;
list<int>::iterator it;
for (i=1;i<=n;i++)
{
for (it=--a[x].end();it!=a[x].begin();it--);
}
while (!coada.empty())
{
x=coada.front();
coada.pop();
for (it=a[x].begin();it!=a[x].end();it++)
{
if (d[*it]==-1)
{
coada.push(*it);
d[*it]=d[x]+1;
}
}
}
for (i=1;i<=n;i++)
g<<d[i]<<" ";
return 0;
}