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- 到底什么是哈希值，哈希值到底是怎么生成的，有什么用？ - 知乎
由于他的调皮，导致客户挑妹纸的时间大幅延长，从10秒到了800秒。 在代码中，一般都有一些比较复杂的算法去运算而得出这个hash值，一旦破解了这个算法，就又可以调皮啦。 在JAVA中，hash算法在HashMap中有体现，有兴趣的可以去看看源码。
- Time complexity of Hash table lookup - Computer Science Stack Exchange
Suppose I have a hash table which stores the some strings Let the index key of this hash table be the length of the string what is the time complexity of checking if the string of length K exists
- hash tables - Number of probes in a successful search in open address . . .
Given an open-address hash table with α α < 1, the expected number of probes in a successful search is at most 1 αln 1 1−α 1 α ln 1 1 α I read this in a book and the proof starts by saying Searching for k follows the same probe sequence as inserting it If k k is the i + 1 i + 1 th key inserted into the table, then 1 1− i m 1 1 m is the maximum expected number of probes for the
- cryptography - Given a string, is it possible to determine which . . .
2) a definite hash of a specific hashing algorithm? Possible methods: 1) For hashes susceptible to rainbow-table attacks, it would be viable to search for the hash in such a rainbow table for various algorithms, to find a match; if a match is found, we know which algorithm produced it
- Hash size: Are prime numbers near powers of two a poor choice for the . . .
For example, suppose we wish to allocate a hash table, with collisions resolved by chaining, to hold roughly n = 2000 n = 2000 character strings, where a character has 8 bits We don't mind examining an average of 3 elements in an unsuccesful search, so we allocate a table of size m = 701 m = 701
- Confusion with analysis of hashing with chaining
I was attending a class on analysis of hash tables implemented using chaining, and the professor said that: In a hash table in which collisions are resolved by chaining, an search (successful or unsuccessful) takes average-case time θ (1 + α), under the assumption of simple uniform hashing
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