human
Solve the following python programming problem given the following code:
def _concordance_index(event_times, predicted_event_times, event_observed) : 
    'Find the concordance index in n * log(n) time.

    Assumes the data has been verified by lifelines.utils.concordance_index first.
    ' 
    died_mask = event_observed.astype (bool) 
    died_truth = event_times [died_mask] 
    ix = np.argsort (died_truth) 
    died_truth = died_truth [ix] 
    died_pred = predicted_event_times [died_mask] [ix] 
    censored_truth = event_times [(~ died_mask)] 
    ix = np.argsort (censored_truth) 
    censored_truth = censored_truth [ix] 
    censored_pred = predicted_event_times [(~ died_mask)] [ix] 
    censored_ix = 0 
    died_ix = 0 
    times_to_compare = _BTree (np.unique (died_pred)) 
    num_pairs = 0 
    num_correct = 0 
    num_tied = 0 
    def handle_pairs(truth, pred, first_ix) : 
        '
        Handle all pairs that exited at the same time as truth[first_ix].

        Returns:
          (pairs, correct, tied, next_ix)
          new_pairs: The number of new comparisons performed
          new_correct: The number of comparisons correctly predicted
          next_ix: The next index that needs to be handled
        ' 
        next_ix = first_ix 
        while ((next_ix < len (truth)) and (truth [next_ix] == truth [first_ix])) : 
            next_ix += 1 
pairs = (len (times_to_compare) * (next_ix - first_ix)) 
        correct = 0 
        tied = 0 
        for i in range (first_ix, next_ix) : 
            (rank, count) = times_to_compare.rank (pred [i]) 
            correct += rank 
            tied += count 
return (pairs, correct, tied, next_ix) 
while True : 
        has_more_censored = (censored_ix < len (censored_truth)) 
        has_more_died = (died_ix < len (died_truth)) 
        if (has_more_censored and ((not has_more_died) or (died_truth [died_ix] > died_ix [censored_ix]))) : 
            (pairs, correct, tied, next_ix) = handle_pairs (censored_truth, censored_pred, censored_ix) 
            censored_ix = next_ix 
else : 
            if (has_more_died and ((not...

    
    

    Fix the buggy line: if (has_more_censored and ((not has_more_died) or (died_truth [died_ix] > died_ix [censored_ix]))) :
assistant
#Here is Python code to find the concordance index in n * log(n) time.

if (has_more_censored and ((not has_more_died) or (died_truth [died_ix] > censored_truth [censored_ix]))) :