Therefore, each point should be prefixed with the control character L. The third control character Z closes a path, which is needed for (multi-)polygons.
因此，每个点之前应该加上控制字符 L 作为前缀。 第三个控制字符 Z 关闭一条路径，这对于（多）多边形是必需的。
2
Every individual starts with fitness 1 at point a and can raise its fitness based on how close it gets to point B. Every command "u", "d", "l", or "r" moves up, down, left, or right, respectively.