##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
You cannot sort by numeric value ( but ). The key insight: compare two numbers and by checking if when concatenated as strings.
For and : compare vs . Since , should come before .
This comparison is transitive, so standard sorting algorithms work correctly with this custom comparator.
