stdlist

What is the difference between std::list and std::map in C++ STL?

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std::map<X, Y>: is an ordered structure with respect to keys (that is, when you iterate over it, keys will be always increasing). supports unique keys (Xs) only offers fast find() method (O(log n)) which finds the Key-Value pair by Key offers an indexing operator map[key], which is also fast std::list<std::pair<X, Y> >: is a simple … Read more

How can I get the penultimate element in a list?

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Rather than decrementing rbegin, you should increment it, as shown here:1 double penultimate = *++foo.rbegin(); as rbegin() returns a reverse iterator, so ++ is the operator to move backwards in the container. Note that I’ve also dropped the superfluous parentheses: that’s not to everyone’s taste. Currently the behaviour of your program is undefined since you … Read more

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