linear-probing | 易学教程

Linear probing huge sequences of keys with unequal hash

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问题 There is one thing about linear probing (hash tables) that is not intuitive to me. If I put key1 which hash results to array index 1. Then I put key2 -> array index 2. Then I put key3 -> again array index 1, this will go to array index 3. Then when I search for key3 I should go through indexes that contain keys that do not have the same hash as mine at all. Isn't this waste? If the sequence is really big and contains many keys (for example I have 20 elements, then null, for any key that

What is primary and secondary clustering in hash?

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问题 I am confused for the last few days in finding the difference between primary and secondary clustering in hash collision management topic in the textbook I am reading. 回答1: Primary clustering means that if there is a cluster and the initial position of a new record would fall anywhere in the cluster the cluster size increases. Linear probing leads to this type of clustering. Secondary clustering is less severe, two records do only have the same collision chain if their initial position is the

What is primary and secondary clustering in hash?

阅读更多关于 What is primary and secondary clustering in hash?

I am confused for the last few days in finding the difference between primary and secondary clustering in hash collision management topic in the textbook I am reading. Primary clustering means that if there is a cluster and the initial position of a new record would fall anywhere in the cluster the cluster size increases. Linear probing leads to this type of clustering. Secondary clustering is less severe, two records do only have the same collision chain if their initial position is the same. For example quadratic probing leads to this type of clustering. Primary Clustering is the tendency