Estimating the fraction of unique elements in a list
101858
Magic 8 Ball Problem
30585
Picking a random element from a set
124890
Divisibility within a block of natural numbers
271
How to get all possible combinations of a list’s elements?
65271
Find the missing and duplicate elements in an array in linear time and constant space
98850
A positional number system for enumerating fixed-size subsets?
49014
Getting unique items from a list
29168
Counting the occurrences / frequency of array elements
93459
Number of permutations of unspecified length
36615
Rule-based creation of sub-lists
111975
Find the item with maximum occurrences in a list
99004
How to compute a discrete histogram of a list
77785
How to find the position of elements in a list satisfying criteria
141502
Take n random elements from a List?
115314
How do you efficiently return all of a List but one element?
33660
Efficiently selecting a set of random elements from a linked list
116647
The number of different ways to choose $k$ out of $n$ unique items