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            "title": "Execution of All Suffix Instructions Staying in a Grid",
            "titleSlug": "execution-of-all-suffix-instructions-staying-in-a-grid",
            "content": "<p>There is an <code>n x n</code> grid, with the top-left cell at <code>(0, 0)</code> and the bottom-right cell at <code>(n - 1, n - 1)</code>. You are given the integer <code>n</code> and an integer array <code>startPos</code> where <code>startPos = [start<sub>row</sub>, start<sub>col</sub>]</code> indicates that a robot is initially at cell <code>(start<sub>row</sub>, start<sub>col</sub>)</code>.</p>\n\n<p>You are also given a <strong>0-indexed</strong> string <code>s</code> of length <code>m</code> where <code>s[i]</code> is the <code>i<sup>th</sup></code> instruction for the robot: <code>&#39;L&#39;</code> (move left), <code>&#39;R&#39;</code> (move right), <code>&#39;U&#39;</code> (move up), and <code>&#39;D&#39;</code> (move down).</p>\n\n<p>The robot can begin executing from any <code>i<sup>th</sup></code> instruction in <code>s</code>. It executes the instructions one by one towards the end of <code>s</code> but it stops if either of these conditions is met:</p>\n\n<ul>\n\t<li>The next instruction will move the robot off the grid.</li>\n\t<li>There are no more instructions left to execute.</li>\n</ul>\n\n<p>Return <em>an array</em> <code>answer</code> <em>of length</em> <code>m</code> <em>where</em> <code>answer[i]</code> <em>is <strong>the number of instructions</strong> the robot can execute if the robot <strong>begins executing from</strong> the</em> <code>i<sup>th</sup></code> <em>instruction in</em> <code>s</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/12/09/1.png\" style=\"width: 145px; height: 142px;\" />\n<pre>\n<strong>Input:</strong> n = 3, startPos = [0,1], s = &quot;RRDDLU&quot;\n<strong>Output:</strong> [1,5,4,3,1,0]\n<strong>Explanation:</strong> Starting from startPos and beginning execution from the i<sup>th</sup> instruction:\n- 0<sup>th</sup>: &quot;<u><strong>R</strong></u>RDDLU&quot;. Only one instruction &quot;R&quot; can be executed before it moves off the grid.\n- 1<sup>st</sup>:  &quot;<u><strong>RDDLU</strong></u>&quot;. All five instructions can be executed while it stays in the grid and ends at (1, 1).\n- 2<sup>nd</sup>:   &quot;<u><strong>DDLU</strong></u>&quot;. All four instructions can be executed while it stays in the grid and ends at (1, 0).\n- 3<sup>rd</sup>:    &quot;<u><strong>DLU</strong></u>&quot;. All three instructions can be executed while it stays in the grid and ends at (0, 0).\n- 4<sup>th</sup>:     &quot;<u><strong>L</strong></u>U&quot;. Only one instruction &quot;L&quot; can be executed before it moves off the grid.\n- 5<sup>th</sup>:      &quot;U&quot;. If moving up, it would move off the grid.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/12/09/2.png\" style=\"width: 106px; height: 103px;\" />\n<pre>\n<strong>Input:</strong> n = 2, startPos = [1,1], s = &quot;LURD&quot;\n<strong>Output:</strong> [4,1,0,0]\n<strong>Explanation:</strong>\n- 0<sup>th</sup>: &quot;<u><strong>LURD</strong></u>&quot;.\n- 1<sup>st</sup>:  &quot;<u><strong>U</strong></u>RD&quot;.\n- 2<sup>nd</sup>:   &quot;RD&quot;.\n- 3<sup>rd</sup>:    &quot;D&quot;.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/12/09/3.png\" style=\"width: 67px; height: 64px;\" />\n<pre>\n<strong>Input:</strong> n = 1, startPos = [0,0], s = &quot;LRUD&quot;\n<strong>Output:</strong> [0,0,0,0]\n<strong>Explanation:</strong> No matter which instruction the robot begins execution from, it would move off the grid.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>m == s.length</code></li>\n\t<li><code>1 &lt;= n, m &lt;= 500</code></li>\n\t<li><code>startPos.length == 2</code></li>\n\t<li><code>0 &lt;= start<sub>row</sub>, start<sub>col</sub> &lt; n</code></li>\n\t<li><code>s</code> consists of <code>&#39;L&#39;</code>, <code>&#39;R&#39;</code>, <code>&#39;U&#39;</code>, and <code>&#39;D&#39;</code>.</li>\n</ul>\n",
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                    "code": "class Solution(object):\n    def executeInstructions(self, n, startPos, s):\n        \"\"\"\n        :type n: int\n        :type startPos: List[int]\n        :type s: str\n        :rtype: List[int]\n        \"\"\"\n        ",
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                    "code": "/**\n * @param {number} n\n * @param {number[]} startPos\n * @param {string} s\n * @return {number[]}\n */\nvar executeInstructions = function(n, startPos, s) {\n    \n};",
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                    "code": "# @param {Integer} n\n# @param {Integer[]} start_pos\n# @param {String} s\n# @return {Integer[]}\ndef execute_instructions(n, start_pos, s)\n    \nend",
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                    "code": "class Solution {\n    func executeInstructions(_ n: Int, _ startPos: [Int], _ s: String) -> [Int] {\n        \n    }\n}",
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                    "code": "func executeInstructions(n int, startPos []int, s string) []int {\n    \n}",
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                    "code": "object Solution {\n    def executeInstructions(n: Int, startPos: Array[Int], s: String): Array[Int] = {\n        \n    }\n}",
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                    "code": "impl Solution {\n    pub fn execute_instructions(n: i32, start_pos: Vec<i32>, s: String) -> Vec<i32> {\n        \n    }\n}",
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                    "code": "(define/contract (execute-instructions n startPos s)\n  (-> exact-integer? (listof exact-integer?) string? (listof exact-integer?))\n\n  )",
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            "hints": [
                "The constraints are not very large. Can we simulate the execution by starting from each index of s?",
                "Before any of the stopping conditions is met, stop the simulation for that index and set the answer for that index."
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