Challenge: Range Extraction.

Question

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

Answer 1

Can you explain your challenge again? I read it 7 times and couldn't understand it at all

Answer 2

https://code.sololearn.com/Wm245cIACAnB/?ref=app

Answer 3

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 )

Answer 4

Is this correct?
https://code.sololearn.com/cpLoW2t98C33/?ref=app

Answer 5

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

Answer 6

heres mine...
check it out

https://code.sololearn.com/cR5W3Apl54iY/?ref=app

Answer 7

https://code.sololearn.com/cc7xQx2R90mr/?ref=app

Answer 8

Here is a short version, just to use elegantly python's possibilities
https://code.sololearn.com/ciH9qbyCE6bA

Answer 9

Extremely badly done but I don't care, there you go: https://code.sololearn.com/WmJhk7XEf30K/?ref=app

(link's not working anymore cuz code removed)

Answer 10

for
-3,-2,-1
it shud be
-3--1
i mean the seperation dash..
😊☺😀

Answer 11

https://code.sololearn.com/c9eLA7DE0Ab7/?ref=app

Answer 12

https://code.sololearn.com/c1TO34Y5k6BY/?ref=app

Answer 13

Ok now I get it but still dislike the syntax you used

Answer 14

Your code is nice, more simple than mine.
I am your 1K follower Kantan LOL

Answer 15

https://code.sololearn.com/cX36k5Apm0yy/?ref=app

Answer 16

https://code.sololearn.com/cBrxm7bkDhXD/?ref=app

Answer 17

Here's my try :
https://code.sololearn.com/cmr1XRN2db8M/?ref=app

Answer 18

It isn't the shortest possible, I believe, but at least readable
https://code.sololearn.com/c8MF0pQ721l6/?ref=app

Answer 19

Here is my try as web...
https://code.sololearn.com/WnXK2sxw2cum/?ref=app

Answer 20

https://code.sololearn.com/cDvBhCUDJg0t/?ref=app