规则Rules：
填入1~9，使得每行、列、宫，以及每一组由灰色线条连结的单元格内的数字不重复。提示表示沿该方向（如在角落，则表示斜向）观察，可以看见的摩天楼数，并且视线会沿着灰色线条拐弯。
Write 1~9, make numbers no repeated in each Row, Column, Box, and each group cells combined by grey lines. The clue is the Skyscraper numbers on this direction (slant direction when the clue is on the corner), with seesights turn with the grey lines.
