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Cod sursa(job #701840)
#include<fstream>
#include<vector>
#include<queue>
#include<cstring>
#define maxn 100010
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
vector<int>a[maxn];
queue<int>q;
int d[maxn],s,n,m;
bool viz[maxn];
void read()
{
in>>n>>m>>s;
int x,y;
for(int i=1;i<=m;i++)
{
in>>x>>y;
a[x].push_back(y);
}
memset(d,-1,sizeof(d));
d[s]=0;
q.push(s);
viz[s]=1;
}
void bfs()
{
while(!q.empty())
{
int nod=q.front();
q.pop();
viz[nod]=1;
for(int i=0;i<a[nod].size();i++)
{
if(viz[a[nod][i]]==0)
{
d[a[nod][i]]=d[nod]+1;
q.push(a[nod][i]);
}
}
}
}
int main()
{
read();
bfs();
for(int i=1;i<=n;i++)
out<<d[i]<<" ";
}