reshape dataframe based on a string split in one column in R

Question

I have the following data structure

ID  Type  Values
1   A     5; 7; 8
2   A     6
3   B     2; 3

and I would like to reshape it to the fol

Answer 1

My shot:

a <- data.frame(id = 1:3, 
                type = c("A", "A", "B"), 
                values = c("5; 7; 8", "6", "2; 3"))

g <- strsplit(as.character(a$values), ";")
data.frame(id = rep(a$id, lapply(g, length)), 
            type = rep(a$type, lapply(g, length)),
            values = unlist(g))