I once had a robotic vacuum cleaner, just put it on the floor and pressed a button, then it would move around in strange directions for about 20-30 minutes and it would be done, it did it better than me, that doesnt say much though
Was 6-7 years ago, there is newer brands on the market now, that can also drive back to recharge automatically and shit like that, I got it because of dog hair (and my GF at that time thought I should help around the house)