algorithm - Difference between binary search tree and m-way tree -


Please explain the difference between binary search tree and m-tree?

Code> m + 1 link.

A binary tree is a special case of an M-tree, in which m is equal to one, which means only one node per node and two links (you either move left or right Or right link) is an example of a binary tree that shows: 

  + ---- + | 20 | + ---- + / \ + ---- + + ---- + | 14 | | 23 + ---- + + ---- +

An m-way tree may have multiple values ​​per node, but the principle is still the same. You can choose which link to go down depending on the values, and m + 1 are possible options. An M-Tre tree (where m 2 is) can look like this Is: 

  + ---- + ---- + | 17 | 30 | + ---- + ---- + ______ / | \ ______ / | \ + ---- + ---- + + ---- + ---- + ---- + ---- + | 11 | 15 | | 19 | 28 | | 33 | 34 + ---- + ---- + + ---- + + ---- + ---- + ---- +

These are M-trees Often used in situations where you can fit more than one value into an efficient block. For example, let's say:

For example, this means that:

  • A disk block is 512 bytes;
  • Value in your tree takes 122 bytes; And
  • Links take 4 bytes.

In this situation, you can fit 4 values ​​into a disk block, this type is calculated: 

  numbers = intestine / (Values ​​+ Linux) = Int ((512-4) / (122 + 4)) = Int (508/126) = int (4.0317) = 4

This gives you 508 bytes Gives four values ​​and five links for: 

  4 * 122 = 488 5 * 4 = 20 --- 508

Although some wastage (this In case there are four bytes), one of the values ​​in each efficiently retrievable block on it There is the benefit of accumulating an integral number.


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