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

from typing import List

class Solution:
    def summaryRanges(self, nums: List[int]) -> List[str]:
        curr_num: List[int] = []
        result: List[str] = []
        for num in nums:
            if len(curr_num) == 0:
                curr_num.append(num)
                continue
            match len(curr_num):
                case 0:
                    curr_num.append(num)
                case 1:
                    if curr_num[0] + 1 == num:
                        curr_num.append(num)
                    else:
                        result.append(str(curr_num[0]))
                        curr_num = [num]
                case 2:
                    if curr_num[1] + 1 == num:
                        curr_num[1] += 1
                    else:
                        result.append('->'.join([str(curr_num[0]), str(curr_num[1])]))
                        curr_num = [num]
        if len(curr_num) == 1:
            result.append(str(curr_num[0]))
        elif len(curr_num) == 2:
            result.append('->'.join([str(curr_num[0]), str(curr_num[1])]))
        return result