Pregunta
Which of the following statement is false?
deques offer rapid insertions and deletions at front
or back and direct access to any element.
The container member function cbegin returns an
iterator that refers to the container’s
first element.
Associative containers are nonlinear data structures
that typically can locate elements
stored in the containers quickly.
multimaps offer one-to-many mapping with
duplicates allowed and rapid key-based
lookup.
deques offer rapid insertions and deletions at front
or back and direct access to any element.
The container member function cbegin returns an
iterator that refers to the container’s
first element.
Associative containers are nonlinear data structures
that typically can locate elements
stored in the containers quickly.
multimaps offer one-to-many mapping with
duplicates allowed and rapid key-based
lookup.
Ask by Barber Pritchard. in the United States
Mar 28,2025
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The statement “The container member function cbegin returns an iterator that refers to the container’s first element” is false.
Solución
The false statement is:
- "The container member function cbegin returns an iterator that refers to the container’s first element."
In C++ the member function
does indeed return an iterator that “points” to the container’s first element, but more precisely it returns a const_iterator rather than a regular (modifiable) iterator. (The term “iterator” by itself might be taken to mean a non‐const iterator, which can be used to modify the pointed-to value. In contrast, a const_iterator does not permit modification of the pointed-to element.)
All of the other statements are true:
- A deque supports rapid insertions and deletions at both the front and back, and also provides random (direct) access to its elements.
- Associative containers (like
, , etc.) are nonlinear data structures that allow fast element lookup (usually in time). - A multimap permits one-to-many mapping, allows duplicate keys, and permits key-based lookups in logarithmic time.
Thus, the only misleading or false statement is the one about
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Simplifique esta solución Extra Insights
The false statement here is that deques offer “direct access to any element.” While deques do allow for rapid insertions and deletions at both ends, they do not guarantee optimal access times for arbitrary elements like arrays or vectors do. Instead, accessing an element in a deque can take longer due to its underlying structure.
Now, let’s look at associative containers. They’re like your trusty treasure map—they help you find what you’re looking for quickly! These containers, like sets and maps, use a key to locate elements efficiently, allowing you to stash things away without losing track of where they are. Not only are they nonlinear, but they also keep your data organized and accessible with remarkable speed!
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