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adding notes about unordered_map/set

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Jidong Xiao
2023-11-07 01:53:47 -05:00
parent 20a1acbb72
commit 2c2f2919f8
1 changed files with 5 additions and 3 deletions
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lectures/20_hash_tables_I/README.md
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@@ -219,11 +219,13 @@ More generally, the jth “probe” of the table is (i + c<sub>1</sub>j + c<sub>
- The Standard Template Library standard and implementation of hash table have been slowly evolving over - The Standard Template Library standard and implementation of hash table have been slowly evolving over
many years. Unfortunately, the names “hashset” and “hashmap” were spoiled by developers anticipating the many years. Unfortunately, the names “hashset” and “hashmap” were spoiled by developers anticipating the
STL standard, so to avoid breaking or having name clashes with code using these early implementations... STL standard, so to avoid breaking or having name clashes with code using these early implementations...
- STL’s agreed-upon standard for hash tables: unordered_set and unordered_map. - STL’s agreed-upon standard for hash tables: unordered_set and unordered_map.
- Depending on your OS/compiler, you may need to add the -std=c++11 flag to the compile line (or other - You can use std::unordered_set the same way as you use std::set, even though the internal of these two are different, the external interface are the same.
- You can use std::unordered_map the same way as you use std::map, even though the internal of these two are different, the external interface are the same.
<!--- Depending on your OS/compiler, you may need to add the -std=c++11 flag to the compile line (or other
configuration tweaks) to access these more recent pieces of STL. (And this will certainly continue to evolve configuration tweaks) to access these more recent pieces of STL. (And this will certainly continue to evolve
in future years!) Also, for many types STL has a good default hash function, so you may not always need to in future years!) Also, for many types STL has a good default hash function, so you may not always need to
specify both template parameters! specify both template parameters!-->
<!--## 20.13 Our Copycat Version: A Set As a Hash Table <!--## 20.13 Our Copycat Version: A Set As a Hash Table