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Cod sursa(job #829958)
#include<fstream>
#include<queue>
#include<vector>
#include <cstring>
using namespace std;
ifstream f("bf.in");
ofstream g("bf.out");
int nivel [1005];
int n, m, p, viz[1005];
vector <int> v[1005];
queue <int> q;
int main(){
f>>n>>m>>p;
for(int i=1; i<=m; ++i){
int x, y;
f>>x>>y;
v[x].push_back(y);
}
q.push(p);
for (int i = 1; i <= n; ++i) nivel[i] = -1;
viz[p]=1;
while(!q.empty()){
int a=q.front();
q.pop();
vector <int>::iterator it=v[a].begin(), sf=v[a].end();
nivel[p] = 0;
for(;it!=sf; ++it)
if(!viz[*it])
{
viz[*it]=1;
q.push(*it);
nivel[*it] = nivel[a]+1;
}
}
for (int i = 1; i <= n; ++i) g << nivel[i] << ' ';
return 0;
}