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题目

Given a sorted integer array without duplicates, return the summary of its ranges.

Example 1:

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

Example 2:

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

解题思路

见程序注释