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#!/usr/bin/env python
# -*- coding: utf-8 -*-
def find_ranges(array):
ranges = []
start, end = None, None
for num in array:
if start is None:
start = end = num
elif num == end + 1:
end = num
else:
if end > start:
ranges.append([start, end])
start = end = num
if start is not None and end > start:
ranges.append([start, end])
return ranges
# Test cases
assert find_ranges([1, 3, 4, 5, 7]) == [[3, 5]], "Example 1"
assert find_ranges([1, 2, 3, 6, 7, 9]) == [[1, 3], [6, 7]], "Example 2"
assert find_ranges([0, 1, 2, 4, 5, 6, 8, 9]) == [
[0, 2], [4, 6], [8, 9]], "Example 3"
print("All tests passed!")
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