3248. 矩阵中的蛇

题目链接：3248. 矩阵中的蛇

代码如下：

class Solution 
{
public:
	int finalPositionOfSnake(int n, vector<string>& commands)
	{
		int i = 0, j = 0;
		for (string& command : commands)
		{
			if (command == "LEFT") { j--; }
			else if (command == "RIGHT") { j++; }
			else if (command == "UP") { i--; }
			else { i++; }
		}
		return i * n + j;
	}
};