/in/foo.cc: In function 'int main()':
/in/foo.cc:9:22: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define rep( i , x ) for ( int i = 0 ; i ++ < x ; )
                      ^
/in/foo.cc:68:5: note: in expansion of macro 'rep'
     rep( i , n ) printf( "%d " , ans[ i ] ) ; printf( "\n" ) ;
     ^~~
/in/foo.cc:68:47: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     rep( i , n ) printf( "%d " , ans[ i ] ) ; printf( "\n" ) ;
                                               ^~~~~~