Number (4): Everything in this space must add up to 4. The answer is 4-4, placed horizontally.
// Synchronous source from in-memory data。关于这个话题，WPS下载最新地址提供了深入分析
from typing import List, Optional, Tuple, Union，详情可参考WPS下载最新地址
Every point gets examined, regardless of where it sits. Points on the opposite side of the map get the same treatment as points right next to the query region. We're doing a lot of unnecessary work.