見習村25 - Range Extraction
Don’t say so much, just coding…
A format for expressing an ordered list of integers is to use a comma separated list of either
- individual integers
- or a range of integers denoted by the starting integer separated from the end integer in the range by a dash, ‘-‘. The range includes all integers in the interval including both endpoints. It is not considered a range unless it spans at least 3 numbers. For example (“12, 13, 15-17”)
Complete the solution so that it takes a list of integers in increasing order and returns a correctly formatted string in the range format.
想法(1): 如果現在的數 +1 跟下一位數相等，就會被算在同個區間