Challenge : compressing lists with successive numbers

Question

You want to compress a list by replacing successions of numbers with the corresponding range.
Ex : [-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20])
==> "-6,-3-1,3-5,7-11,14,15,17-20"

Write the program doing this compression. Oneliners welcomed !

Answer 1

It seems impossible to write in one line... Separate input numbers with spaces.
https://code.sololearn.com/cqNjsJ4xe2SV/?ref=app

Answer 2

https://code.sololearn.com/cdsmnQQS0Tcr/#py

EDIT: @VcC oops! my bad! fixed it :)
it's not even close to be as short as you've shown to be possible, but it does the job :p

Answer 3

Oneliners friends where are you ?
https://code.sololearn.com/c82XfKVLiK5G/?ref=app

Answer 4

@VcC I have fixed the code, thanks for your comments!

Answer 5

https://code.sololearn.com/ch5vQ4f0C3ab/?ref=app

Answer 6

heres mine....##)

https://code.sololearn.com/cDMvDFzgA0LA/?ref=app

Answer 7

Not impossible ! Can provide test input or use the proposed format to facilitate testing ?

Answer 8

@VcC for example,
3 7 8 9 10 14 21 22 23

Answer 9

Good work but not 100% ok. check the proposed example