lootland(for this builder)

Lootland is the home of builders, builders are invited-only, each builder can mint at most two piece of land,the minted lands can only be used for invitation, only one person can be invited to each piece of land,each person can only accept an invitation once! It is a land space with (x,y) as coordinates. The positive x-axis is east and negative is west, the positive y-axis is north and negative is south, the values of x and y can only be integers, there is no range limit, each coordinate position represents an area of 100 x 100 square meters.