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Cod sursa(job #283877)
#include <cstdio>
#include <vector>
#include <queue>
using namespace std;
const int N=100004;
int n,s;
vector<int> d(N,-1);
vector<int> a[N];
void citire()
{
int m,x,y;
scanf("%d %d %d",&n,&m,&s);
while(m--)
{
scanf("%d %d",&x,&y);
a[x].push_back(y);
}
}
void bfs()
{
queue<int> coada;
int x,y;
d[s]=0;
coada.push(s);
vector<int>::iterator it;
while(!coada.empty())
{
x=coada.front();
coada.pop();
for(it=a[x].begin(); it!=a[x].end() ;it++)
{
y=*it;
if(d[y]==-1)
{
d[y]=1+d[x];
coada.push(y);
}
}
}
}
void scrie()
{
for(int i=1;i<=n;i++)
printf("%d ",d[i]);
printf("\n");
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
citire();
bfs();
scrie();
return 0;
}