Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:4:232: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] using namespace std;ifstream in("bfs.in");ofstream out("bfs.out");vector<int>v[100001];queue<int>q;int n,m,s,x,y,a[100001];void bfs(int root){a[root]=1;q.push(root);while(!q.empty()){int x=q.front();q.pop();for(int i=0;i<v[x].size();++i)if(a[v[x][i]]==0){a[v[x][i]]=a[x]+1;q.push(v[x][i]);}}}int main(){in>>n>>m>>s;for(int i=0;i<m;++i){in>>x>>y;v[x].push_back(y);}bfs(s);for(int i=1;i<=n;++i)out<<a[i]-1<<' ';return 0;} ^