/in/foo.cc: In function 'int main()':
/in/foo.cc:42:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(!fa) root=num;add(fa,num);
   ^~
/in/foo.cc:42:20: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   if(!fa) root=num;add(fa,num);
                    ^~~