Counter min sketch is a data structure that using memory to trade the accuracy, it often using in increasing steaming counter
https://en.wikipedia.org/wiki/Count%E2%80%93min_sketch
im wondering can it apply to handle the counter of up&down vote event, e.g stackoverflow up&down vote
My research told me the answer seem not possible, even having a duel counter min sketch, one for increase, one for decrease
but end up 2 approximate number combine together ( CMS1 - CMS2 ) may result more inaccuracy