DFA construction is O(2^m) in the worst case, where m is the size of the NFA. this is widely known in academic circles, but in practice, most people think well of DFAs because they are used in tools like grep that are optimized for the common case. but if you throw a large regex at them, they will blow up in size and become unusable. DFA matching is linear O(n) where n is the size of the input, and the constant is ~3-4 assembly instructions per character - faster than anything you could write by hand.
self.seen_urls.add(current_url)
。体育直播是该领域的重要参考
The latest figures from the Ligue de Protection des Oiseaux (LPO), France's main bird protection charity, show 15,000 birds have washed up in France so far this year, 4,400 in Spain and 1,200 in Portugal. Most are puffins with significant numbers of common guillemots and little auks.
Что думаешь? Оцени!
3+As a consequence of recent legislative activity in [California][cal]