{'fraction_non_alphanumeric': 0.02197802197802198, 'fraction_numerical': 0.0, 'mean_word_length': 4.857142857142857, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Efficient implementation of the first-fit strategy for dynamic storage allocation

We describe an algorithm that efficiently implements the first-fit strategy for dynamic storage allocation. The algorithm imposes a storage overhead of only one word per allocated block (plus a few percent of the total space used for dynamic storage), and the time required to allocate or free a block is O(log W), where W is the maximum number of words allocated dynamically. The algorithm is faster than many commonly used algorithms, especially when many small blocks are allocated, and has good worst-case behavior. It is relatively easy to implement and could be used internally by an operating system or to provide run-time support for high-level languages such as Pascal and Ada. A Pascal implementation is given in the Appendix.