Leetcode 228. Summary Ranges

1. Description

2. Solution

• Version 1

代码语言：javascript复制

class Solution:
    def summaryRanges(self, nums):
        result = []
        length = len(nums)

        i = 0
        while i < length:
            if i == length - 1 or nums[i]   1 != nums[i   1]:
                result.append(str(nums[i]))
                i  = 1
                continue

            start = nums[i]
            while i   1 < length and nums[i]   1 == nums[i   1]:
                i  = 1
            end = nums[i]
            result.append(str(start)   '->'   str(end))
            i  = 1

        return result

• Version 2

代码语言：javascript复制

class Solution:
    def summaryRanges(self, nums):
        result = []

        for num in nums:
            if num - 1 not in nums and num   1 not in nums:
                result.append(str(num))
                continue

            if num - 1 not in nums:
                start = num

            if num   1 not in nums:
                end = num
                result.append(str(start)   '->'   str(end))

        return result

Reference

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

version

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