Question

Generate all lists of size n, such that each element is between 0 and m (inclusive).

There are (m+1)^n such lists.

Answer 1

There are two easy ways of writing the general case. One is described in the existing answer from @didierc. The alternative is recursion.

For example, think about a method that takes a String as an argument:

if(input string is long enough)
  print or store it
else
  iterate over digit range
    recursive call with the digit appended to the string