Question: How to sweep the floors in a house?
Option 0: With a broom, sweep detritus into a pile in corner of the room. Sweep the pile of detritus into the dustpan. Repeat the process in one room.
Option 1: With a broom, sweep detritus into a pile in one corner of the room. Sweep the pile of detritus into the dustpan. Repeat the process in every room.
Answer: 1