Top "Set-intersection" questions

The intersection of two or more sets consists of the elements that those sets all have in common.

Best way to find the intersection of multiple sets?

I have a list of sets: setlist = [s1,s2,s3...] I want s1 ∩ s2 ∩ s3 ... I can write a function …

python set set-intersection
Computing set intersection in linear time?

Is there an algorithm that, given two sets, computes their intersection in linear time? I can run two for loops …

algorithm math data-structures big-o set-intersection
Union or intersection of Java Sets

What is the simplest way to make a union or an intersection of Sets in Java? I've seen some strange …

java collections set set-intersection set-union
Difference and intersection of two arrays containing objects

I have two arrays list1 and list2 which have objects with some properties; userId is the Id or unique property: …

javascript arrays set-intersection set-difference set-operations
Intersection of java.util.Map

Is there a method in java.util.Map or any util to perform an intersection on two maps? (To intersect …

java dictionary collections set-intersection
PostgreSQL check if array contains any element from left-hand array

I know that in PostgreSQL you can run a query like: SELECT (1 = ANY('{1,3,4,7}'::int[])) AS result to check …

arrays postgresql set-intersection
Trying to understand "except all" in sql query

I came across this example and I don't understand what it means. (SELECT drinker FROM Frequents) EXCEPT ALL (SELECT drinker …

sql intersect set-intersection set-difference set-operations
How do I check if one vector is a subset of another?

Currently, I think my best option is to use std::set_intersection, and then check if the size of the …

c++ subset set-intersection
Intersection of lists in R

Is there a function that receives a list x and returns a list y such that y[[i]] = intersect(x[[1]][[…

r list set-intersection
Efficient set intersection of a collection of sets in C++

I have a collection of std::set. I want to find the intersection of all the sets in this collection, …

c++ algorithm stl set-intersection