228. Summary Ranges

https://leetcode.com/problems/summary-ranges/

Python

Two Pointer

class Solution:
    def summaryRanges(self, nums: List[int]) -> List[str]:
        length = len(nums)

        if length < 2:
            return [str(num) for num in nums]

        cur, fast = 0, 0
        result = []
        while fast < length - 1:
            if nums[fast] + 1 == nums[fast+1]:
                fast += 1
                continue
            result.append(
                "{}->{}".format(nums[cur], nums[fast]) if cur != fast
                else str(nums[fast])
            )
            fast += 1
            cur = fast

        result.append(
            "{}->{}".format(nums[cur], nums[fast]) if cur != fast
            else str(nums[fast])
        )

        return result