/in/foo.cc: In function 'int main()':
/in/foo.cc:26:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=0;i<K;i++)cout<<l0[i].b<<" ";cout<<endl;
  ^~~
/in/foo.cc:26:41: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  for(int i=0;i<K;i++)cout<<l0[i].b<<" ";cout<<endl;
                                         ^~~~