Three more fundamental algorithms in the series. Today, recursive permutations, subsets of the given set and variations with repetitions. The all written in C++ (non generic, I used std::vector
). Code (hope it's self explanatory, any questions ask).
Whole series.
Thank you.
vector size() is not int! It is a size_t. This is a source of Bugs.
ReplyDeleteprintList should take a const vector<>& , it is expensive to copy.
ReplyDeleteThe same applies to other functions life for example "void recPermutation(vector s, vector r)"
ReplyDeleteYou should use a reference instead of copying if you don't need a copy. Also use a const& if you can. You probably come from python and in python everything is a reference and copy is explicit, where in c/c++ everything is a copy and a reference has to be explicit.
Use for example: void recPermutation(vector const & s, vector const & r)
or void recPermutation(cont vector& s, const vector& r) which is the same to the line above.
That's all true, thanks, I'm gonna edit the code.
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