Removing the common elements in i+1 th vector of a list in base R

Question

I was wondering how if I could find & remove the common elements in i+1 -th vector of a list (in base R )?

For example:

x = list(a = 1:5, b = 3:7, c = 6:9)      # Initial list
common <- # your solution                # ? find common values

 for(i in 1:length(x)) {

  # your solution: ?create `b` removing common elements with `a`
  # your solution: ?create `c` removing common elements with `b`
}

Answer 1

当我们比较相邻元素时，在删除last和first元素的list last使用setdiff并更新“x” list

x[-1] <- Map(setdiff, x[-1], x[-length(x)])