Write a program that takes a list of integers in increasing order and returns a correctly formatted string in the range format.
Example:
Input: [-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20]
Output "-6,-3-1,3-5,7-11,14,15,17-20"
Example 2:
Input: [-5,-4,0,5,6,7,9,10]
output: "-5,-4,0,5-7,9,10"
Example 3:
Input: [1,2,3,5,6,8,9,10,11]
Output: "1-3,5,6,8-11"
Note: a range spans at least 3 numbers. e.g. 1,2,3: 1-3 and 5,6: 5,6 and 8,9,10,11: 8-11
Have fun!
Here, the reference: https://www.rosettacode.org/wiki/Range_extraction
and here the kata: https://www.codewars.com/kata/51ba717bb08c1cd60f00002f
For those Who don't understand the challenge basicly if you have a range of numbers like 0,1,2,3,5,6,7 the output Will be 0-3,5-7 indicating the number in range beetween 0 and 3 in increasing order and then from 5-7 beacuse they have both in beetween numbers that are consequential. ( Sorry for the bad english )
for those who might not understand:
take a list of integers which increase in order and find 3+ numbers which follow each other directly, example: 1,2,3 or 6,7,8 or 17,18,19, and make them into the format of 1-3, 6-8, 17-19, and include the other numbers.
OK so to clarify, a list - [-6,-5,-2,0,1,2,3,6,7,9,10,11]
when you change it to the required format:
"-6,-5,-2,0-3,6,7,9-11"
So we are just grouping 3 or more consecutive numbers in a list.
If I've made a mistake feel free to correct me in the comments
