How would you display an array of integers as a set of ranges? (algorithm)

Question

Given an array of integers, what is the simplest way to iterate over it and figure out all the ranges it covers? for example, for an array such as:

$numbers = ar         


        

Answer 1

Here's a python implementation, it should be easy enough to follow

numbers = [1,3,4,5,6,8,11,12,14,15,16];

def is_predecessor(i1, i2):
    if i1 == i2 - 1:
        return True;
    else:
        return False;

def make_range(i1, i2):
    if i1 == i2:
        return str(i1);
    else:
        return str(i1) + "-" + str(i2);

previous_element = None;
current_start_element = None;

for number in numbers:
    if not is_predecessor(previous_element, number):
        if current_start_element is not None:
            print make_range(current_start_element, previous_element);
        current_start_element = number;
    previous_element = number;

# handle last pair
if current_start_element is not None:
    print make_range(current_start_element, previous_element);

This outputs:

1
3-6
8
11-12
14-16

I know, I know, it isn't an algorithm, but I found it harder to actually explain it without having indentation problems than to just implement a solution for it.