evenvalue's blog

Renaming Ordered Sets to something better
By evenvalue, 6 months ago, In English

Hello Codeforces!

I wanted to discuss something extremely important. About the name for Ordered Sets.

The normal std::set is also ordered, then why is it not called ordered set? Ordered Sets aren't useful because they are just ordered, its because they also allow us to index the set.

Hence I believe Indexed Sets would be a better name for it. If you have any other suggestions for the name lmk!

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6 months ago, # |
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Absolutely agree, petition to call it i_set

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6 months ago, # |
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true (orz)

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6 months ago, # |
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Wtf strong

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6 months ago, # |
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Everyone I know calls it indexed set lol

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6 months ago, # |
  Vote: I like it +69 Vote: I do not like it

Everyone asks why ordered set, but no one asks how's ordered set :(

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6 months ago, # |
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std::better_set

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    6 months ago, # ^ |
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    ah yes, betset for short

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    6 months ago, # ^ |
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    please stop making me think of what would bitter_set for short is..

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6 months ago, # |
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ChronoSorted Vector

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6 months ago, # |
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Chinese set

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6 months ago, # |
  Vote: I like it +22 Vote: I do not like it

I see you have nothing better to do

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    6 months ago, # ^ |
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    Did you use magic to spy on him and see it?

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      6 months ago, # ^ |
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      idk whether he used magic to spy on me or not, but what he said was not untrue

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6 months ago, # |
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Well, from my understanding it is called that as short for order statistic sets, since they provide order statistic about the set. But I agree, indexed set is a good name.

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6 months ago, # |
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Ranked Set

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6 months ago, # |
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set2

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6 months ago, # |
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How do you index the std::set? I think, it doesn't have interface to find $$$k$$$-th element.

Though, this set has it.

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4 months ago, # |
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I believe the name comes from ordered statistics.

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4 months ago, # |
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I believe the name ordered_set was popularized by this blog 10 years ago introducing Policy-based data structures here on Codeforces. The most accurate name for the data structure is probably Order Statistic Tree (USACO Guide also mentions the name here). However, you can abstract it as whatever makes the most sense (and convenient) to you. For me, I use indexed_set because it sounds reasonable enough since you can practically index the set (not multiset) using order_of_key. As a matter of fact, the Competitive Programmer's Handbook also mentions it here.

Or if you're lazy, using Set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;.

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