411 REFERENCE · Wikibooks
C++ Language/Std/Stl/CollectionClasses/SequenceCollections/List
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A "list" (an instance of class std::list<>) is a doubly-linked-list.
A list doesn't provide any random-access indexing.
In order to access a particular item, you need to iterate to it.
Additional information about STL lists (includes interactive examples)