[Mathematics] The streets in a certain place are in a grid shape, and the distance between adjacent streets is 1 ................................................................................................................................. Starting from the x axis, we assume that the initial x=0.

Then when moving from x=0 to x= 1, the distance of each retail store changes:

The distance between two retail stores with x less than 0 increased by 1, while the distance between four retail stores with x greater than 0 decreased by 1.

That is, the total distance is reduced by 2, then this movement is cost-effective.

So, where should I move to be the most cost-effective?

It should be moved to a place bigger than him and smaller than his retail store. As far as x is concerned, it is 3.

For example, if you move to 3, you have to move it again. If you move to 4,

There are two x's

So this kind of movement is not cost-effective, and it is not cost-effective to move from 3 to 2.

So x=3 is the most cost-effective.

Similarly, the most cost-effective y is 3 or 4.

Because (3,4) is already a retail store, only (3,3) is taken.