UC知道英文四级这段话能看懂过得了吗?
来源：百度知道 编辑：UC知道 时间：2024/05/12 10:02:09
也不是看的很懂是大致看的懂
Hash tables
The difficulty with direct addressing is obvious: if the universe U is large, storing a table T of size |U| may be impractical, or even impossible, given the memory available on a typical computer. Furthermore, the set K of keys actually stored may be so small relative to U that most of the space allocated for T would be wasted.
When the set K of keys stored in a dictionary is much smaller than the universe U of all possible keys, a hash table requires much less storage than a direct-address table. Specifically, the storage requirements can be reduced to Θ(|K|) while we maintain the benefit that searching for an element in the hash table still requires only O(1) time. The only catch is that this bound is for the average time, whereas for direct addressing it holds for the worst-case time.
With direct addressing, an element with key k is stored in slot k. With hashing, this element is stored in slot h(k); that is, we use a
Hash tables
The difficulty with direct addressing is obvious: if the universe U is large, storing a table T of size |U| may be impractical, or even impossible, given the memory available on a typical computer. Furthermore, the set K of keys actually stored may be so small relative to U that most of the space allocated for T would be wasted.
When the set K of keys stored in a dictionary is much smaller than the universe U of all possible keys, a hash table requires much less storage than a direct-address table. Specifically, the storage requirements can be reduced to Θ(|K|) while we maintain the benefit that searching for an element in the hash table still requires only O(1) time. The only catch is that this bound is for the average time, whereas for direct addressing it holds for the worst-case time.
With direct addressing, an element with key k is stored in slot k. With hashing, this element is stored in slot h(k); that is, we use a
四级有时间限制的，你能看懂，是多长时间能看懂啊，而且四级又不是只考阅读理解，还有别的比如听力能力，你能看懂这段话说明你的词汇量、阅读能力很好，但又说明什么问题吗？自己想想，你心目中的标准答案期待是什么样的呢？！人家回答你“能”又怎样，“不能”又怎样，有什么凭据啊，都副总裁级别了，这点道理不懂吗。
买套模拟题做做，费不了你多长时间，模拟分数才能给你依据。