combination without repetition of N elements without use for..to..do

Question

i want load in a list the combination of N number without repetition, giving to input the elements and group. For example, with 4 elements [1,2,3,4], i have for:

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Answer 1

Following the link that David posted and clicking around led me to an article where they coin the term "Banker's Search", which seems to fit your pattern.

The article provides an example solution in C++, utilizing recursion:

Efficiently Enumerating the Subsets of a Set