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Cod sursa(job #799632)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
const int N = 100001;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> a[N];
queue <int> q;
int n,m,d[N],g,x,y;
void citire()
{
fin>>n>>m>>g;
for(int i=0;i<m;i++)
{
fin>>x>>y;
a[x].push_back(y);
}
for(int i=0;i<=n;i++)
d[i]=-1;
}
void bfs()
{
q.push(g);
d[g]=0;
while(!q.empty())
{
x=q.front();
q.pop();
for(size_t i=0;i<a[x].size();i++)
{
y=a[x][i];
if(d[y]==-1)
{
q.push(y);
d[y]=1+d[x];
}
}
}
}
void tipar()
{
int i=n;
for(i=1;i<=n;i++)
{
fout<<d[i]<<" ";
}
}
int main()
{
citire();
bfs();
tipar();
}