AMR-KELEG's blog

By AMR-KELEG, history, 5 years ago, In English

I have lately learned how to use the LCA algorithm.

I am now wondering whether HLD can be used to solve problems that LCA can't solve or not?

What are your thoughts?


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5 years ago, # |
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Good day to you,

Well in my opinion this is hardly answered, since LCA is more-like "problem" than algorithm (or group of algorithms), which can be solved with multiple algorithms, such as: HLD, Binary Lifting, EulerTourTree+SparseTable, Tarjan, DP, simple dfs and so on.

Probably each of them has some draw-backs/advantages.

So more-like: HLD is a kind of "LCA algorithms".

The big advantage of HLD is, that is can easily divide the tree, so one can "dynamicaly update" with decent access time [+ it is easy to grapple many structures to the decomposed tree].

Also — it can be (unlike some other LCA algorithms) used in opposite way: to "write" an information to multiple nodes "at once" [like in segment tree ... or well, basically with usage of segment tree {or similar} :) ]

Have Nice Day & Good Luck ^_^