Given a sorted integer array that does not contain any duplicates, return a summary of the number ranges it contains.

Example

• For nums = [-1, 0, 1, 2, 6, 7, 9], the output should be composeRanges(nums) = ["-1->2", "6->7", "9"].

Hints

• push()

Input/Output

• [execution time limit] 5 seconds (ts)

• [input] array.integer nums A sorted array of unique integers.

  Guaranteed constraints:

  0 ≤ nums.length ≤ 15, (231 - 1) ≤ nums[i] ≤ 231 - 1.

• [output] array.string