class Solution:
    def summaryRanges(self, nums: List[int]) -> List[str]:
        ans = []
        cur_range = None

        def pop_cur_range() -> None:
            nonlocal ans, cur_range
            if cur_range is None:
                return

            if cur_range[0] == cur_range[1]:
                ans.append(f"{cur_range[0]}")
            else:
                ans.append(f"{cur_range[0]}->{cur_range[1]}")
            cur_range = None

        for n in nums:
            if cur_range is not None and cur_range[1] + 1 != n:
                pop_cur_range()
            if cur_range is None:
                cur_range = [n, n]
            cur_range[1] = n
        pop_cur_range()
        return ans