Summary Ranges Python Solution with Tests

lcpy gen -n 228   # by problem number
lcpy gen -s summary_ranges   # by problem name

Input: nums = [0,1,2,4,5,7]
Output: ["0->2","4->5","7"]

Input: nums = [0,2,3,4,6,8,9]
Output: ["0","2->4","6","8->9"]

class Solution:
    # Time: O(n)
    # Space: O(1) excluding output
    def summary_ranges(self, nums: list[int]) -> list[str]:
        result: list[str] = []
        i = 0
        while i < len(nums):
            start = nums[i]
            while i + 1 < len(nums) and nums[i + 1] == nums[i] + 1:
                i += 1
            if start == nums[i]:
                result.append(str(start))
            else:
                result.append(f"{start}->{nums[i]}")
            i += 1
        return result