hi! o(1) in best its obviously, if the element is the first ) I talk about worst of coz.

Hi! Not bad idea, but .remove() modify List - create (see source) new array as fact. Its dramatically decrease performance on huge array. GL!

time complexity O(n^2)... )))))) ooookey realy best practies

hi! I think used "timer" (time) its bad idea... what about time-for-one-customers like 10^6 ? For Example {130000, 140000, 150000, 160000, 120000 ...} :-/

hi ^_^ you used .sort() - customers+1 times. What about realy big supermarket with 10^8 of customres and 10^2 tills? ;))) This kata may solved w/o sort anyway

Oh, just another solve with .sort() Hi! What about 10^8 elements array?

hi! IMHO i make a realy fast solution with O(n/3)! 100000000 elements complite on 165 millis ))) May you see my work? One important note - i used Double.compare coz... we work with double values ))) If array contained integer values speed disastrously grow