Pagini recente » Cod sursa (job #867162) | Cod sursa (job #2884617) | Cod sursa (job #1596898) | Cod sursa (job #2729158) | Cod sursa (job #2148299)
#include <fstream>
#include <set>
#include <queue>
#include <iostream>
#include <cmath>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
set <int> v[100005];
queue <int> q;
int N,M,S,x,y,viz[100005],nivel[100005],p;
void BFS(int i)
{
viz[i]=1;
nivel[i]=0;
q.push(i);
while(!q.empty())
{
p=q.back();
for(set<int>::iterator it=v[p].begin();it!=v[p].end();it++)
{
if(!viz[*it])
{
viz[*it]=1;
q.push(*it);
nivel[*it]=nivel[p]+1;
}
}
q.pop();
}
}
int main()
{
fin>>N>>M>>S;
for(int i=1;i<=M;i++)
{
fin>>x>>y;
v[x].insert(y);
}
BFS(S);
for(int i=1;i<=N;i++)
{
if(!viz[i]) fout<<"-1"<<' ';
else fout<<nivel[i]<<' ';
}
return 0;
}