Square 电面

Langton's Ant is a simulation that consists of an ant moving around a grid of cells. Each cell can be either colored black or white, and the grid starts off completely white. The ant is facing one of four directions (up, down, left or right), and follows a set of rules to move based on the color of the cell it is currently on.

1. If the ant is on a white cell, it turns 90 degrees to the right, and move

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the ant to take, print out the state of the grid. For the purposes of this question, the ant will always start off on a white square.

Input:
....
.<..
....
steps=7

Output:
.##.
^.#.
##..
*/

请问, 如果越界了怎么办, 比如grid里面就只有一个cell, 要走n步, 然后蚂蚁是会保持在原来的地方?