画线填格小游戏的代码，命令行界面的，需要手动输入坐标，比较简陋。。。相当简陋。。 在#define N那行可以更改（n*n）阶数。-Fill the grid line drawing game code, command line interface, you need to manually enter the coordinates, a little simple. . . OK, very simple. . # Define N in the line can be ch