2012年11月12日 · Using a regular hash like SHA-256, you will have to hash the file chunk and the entire file separately. If the file is 8 GiB, this might take quite some time. With a tree hash, because the hash of the chunk is used to compute the hash of the file, it takes no extra work to compute both hashes. How much extra work is a tree hash?

2010年6月4日 · I am trying to implement Apriori Algorithm for my Data Mining Project & HashTree is a good data structure for calculating the support count of generated candidates. Can someone specify how to implement hash tree (as I am not able to find good info on hashtree on web). Any help would be appreciated, thank you! –

2013年8月24日 · If h_tree(T) is a hash of all paths-to-leafs of T, where the order of the paths does not alter the outcome, then it is a good hash for the whole of T, in the sense that equivalent trees will produce equal hashes, according to the above definition of equivalence. So I propose:

2016年5月31日 · In the following Binary tree is assumed to be self-balancing, like a red black tree, an AVL tree or like a treap. On the other hand, if you need to rehash everything in the hash table when you decide to extend it, this may be a costly operation which occur (amortized). Binary trees does not have this limitation.

A tree unless implemented as search tree, can't give you ordered data because tree can be any kind of tree. So to make TreeMap work like Sorted order, it implements SortedMap ( e.g, Binary Search Tree - BST, balanced BST like AVL and R-B Tree , even Ternary Search Tree - mostly used for iterative searches in ordered way ).

2020年7月28日 · Actually, it seems that MySQL uses both kind of indexes either a hash table or a b-tree according to the following link. The difference between using a b-tree and a hash table is that the former allows you to use column comparisons in expressions that use the =, >, >=, <, <=, or BETWEEN operators, while the latter is used only for equality ...

2017年6月14日 · How to define hash function for a tree structure which depends only on the structure of the tree, and is same irrespective of node labels? For example, 2--1--3--4 should have same hash function as 1--4--2--3 or 4--1--3--2.

The discussion there also points out an interesting 'middle ground' approach to the Tree vs Hash question. Java provides a LinkedHashSet, which is a HashSet with an "insertion-oriented" linked list running through it, that is, the last element in the …

2016年10月24日 · If there's a chance that the symbols will be too orderly, a Red-Black Tree is a better option. Hash tables give O(1) average insert and lookup complexity, but there's a caveat here, too. If your hash function is bad (and I mean really bad) you could end up building a linked list here as well. Any reasonable string hash function should do ...

2010年1月9日 · The hash function should depend on the hash code of every node within the tree as well as its position. Check. We are explicitly using node.GetHashCode() in the computation of the tree's hash code. Further, because of the nature of the algorithm, a node's position plays a role in the tree's ultimate hash code.