{ "data": { "question": { "questionId": "3533", "questionFrontendId": "3248", "categoryTitle": "Algorithms", "boundTopicId": 2874939, "title": "Snake in Matrix", "titleSlug": "snake-in-matrix", "content": "

There is a snake in an n x n matrix grid and can move in four possible directions. Each cell in the grid is identified by the position: grid[i][j] = (i * n) + j.

\n\n

The snake starts at cell 0 and follows a sequence of commands.

\n\n

You are given an integer n representing the size of the grid and an array of strings commands where each command[i] is either "UP", "RIGHT", "DOWN", and "LEFT". It's guaranteed that the snake will remain within the grid boundaries throughout its movement.

\n\n

Return the position of the final cell where the snake ends up after executing commands.

\n\n

 

\n

Example 1:

\n\n
\n

Input: n = 2, commands = ["RIGHT","DOWN"]

\n\n

Output: 3

\n\n

Explanation:

\n\n
\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
01
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\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
01
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\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
01
23
\n
\n
\n\n

Example 2:

\n\n
\n

Input: n = 3, commands = ["DOWN","RIGHT","UP"]

\n\n

Output: 1

\n\n

Explanation:

\n\n
\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
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\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
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\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
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\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
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678
\n
\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "矩阵中的蛇", "translatedContent": "

大小为 n x n 的矩阵 grid 中有一条蛇。蛇可以朝 四个可能的方向 移动。矩阵中的每个单元格都使用位置进行标识： grid[i][j] = (i * n) + j。

\n\n

蛇从单元格 0 开始，并遵循一系列命令移动。

\n\n

给你一个整数 n 表示 grid 的大小，另给你一个字符串数组 commands，其中包括 \"UP\"、\"RIGHT\"、\"DOWN\" 和 \"LEFT\"。题目测评数据保证蛇在整个移动过程中将始终位于 grid 边界内。

\n\n

返回执行 commands 后蛇所停留的最终单元格的位置。

\n\n

 

\n\n

示例 1：

\n\n
\n

输入：n = 2, commands = [\"RIGHT\",\"DOWN\"]

\n\n

输出：3

\n\n

解释：

\n\n
\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
01
23
\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
01
23
\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
01
23
\n
\n
\n\n

示例 2：

\n\n
\n

输入：n = 3, commands = [\"DOWN\",\"RIGHT\",\"UP\"]

\n\n

输出：1

\n\n

解释：

\n\n
\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
345
678
\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
345
678
\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
345
678
\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
012
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\n
\n
\n\n

 

\n\n

提示：

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