mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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169 lines
26 KiB
JSON
169 lines
26 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "2178",
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"questionFrontendId": "2069",
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"boundTopicId": null,
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"title": "Walking Robot Simulation II",
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"titleSlug": "walking-robot-simulation-ii",
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"content": "<p>A <code>width x height</code> grid is on an XY-plane with the <strong>bottom-left</strong> cell at <code>(0, 0)</code> and the <strong>top-right</strong> cell at <code>(width - 1, height - 1)</code>. The grid is aligned with the four cardinal directions (<code>"North"</code>, <code>"East"</code>, <code>"South"</code>, and <code>"West"</code>). A robot is <strong>initially</strong> at cell <code>(0, 0)</code> facing direction <code>"East"</code>.</p>\n\n<p>The robot can be instructed to move for a specific number of <strong>steps</strong>. For each step, it does the following.</p>\n\n<ol>\n\t<li>Attempts to move <strong>forward one</strong> cell in the direction it is facing.</li>\n\t<li>If the cell the robot is <strong>moving to</strong> is <strong>out of bounds</strong>, the robot instead <strong>turns</strong> 90 degrees <strong>counterclockwise</strong> and retries the step.</li>\n</ol>\n\n<p>After the robot finishes moving the number of steps required, it stops and awaits the next instruction.</p>\n\n<p>Implement the <code>Robot</code> class:</p>\n\n<ul>\n\t<li><code>Robot(int width, int height)</code> Initializes the <code>width x height</code> grid with the robot at <code>(0, 0)</code> facing <code>"East"</code>.</li>\n\t<li><code>void step(int num)</code> Instructs the robot to move forward <code>num</code> steps.</li>\n\t<li><code>int[] getPos()</code> Returns the current cell the robot is at, as an array of length 2, <code>[x, y]</code>.</li>\n\t<li><code>String getDir()</code> Returns the current direction of the robot, <code>"North"</code>, <code>"East"</code>, <code>"South"</code>, or <code>"West"</code>.</li>\n</ul>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"example-1\" src=\"https://assets.leetcode.com/uploads/2021/10/09/example-1.png\" style=\"width: 498px; height: 268px;\" />\n<pre>\n<strong>Input</strong>\n["Robot", "move", "move", "getPos", "getDir", "move", "move", "move", "getPos", "getDir"]\n[[6, 3], [2], [2], [], [], [2], [1], [4], [], []]\n<strong>Output</strong>\n[null, null, null, [4, 0], "East", null, null, null, [1, 2], "West"]\n\n<strong>Explanation</strong>\nRobot robot = new Robot(6, 3); // Initialize the grid and the robot at (0, 0) facing East.\nrobot.move(2); // It moves two steps East to (2, 0), and faces East.\nrobot.move(2); // It moves two steps East to (4, 0), and faces East.\nrobot.getPos(); // return [4, 0]\nrobot.getDir(); // return "East"\nrobot.move(2); // It moves one step East to (5, 0), and faces East.\n // Moving the next step East would be out of bounds, so it turns and faces North.\n // Then, it moves one step North to (5, 1), and faces North.\nrobot.move(1); // It moves one step North to (5, 2), and faces <strong>North</strong> (not West).\nrobot.move(4); // Moving the next step North would be out of bounds, so it turns and faces West.\n // Then, it moves four steps West to (1, 2), and faces West.\nrobot.getPos(); // return [1, 2]\nrobot.getDir(); // return "West"\n\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 <= width, height <= 100</code></li>\n\t<li><code>1 <= num <= 10<sup>5</sup></code></li>\n\t<li>At most <code>10<sup>4</sup></code> calls <strong>in total</strong> will be made to <code>step</code>, <code>getPos</code>, and <code>getDir</code>.</li>\n</ul>\n",
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"lang": "C++",
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"code": "class Robot {\npublic:\n Robot(int width, int height) {\n \n }\n \n void step(int num) {\n \n }\n \n vector<int> getPos() {\n \n }\n \n string getDir() {\n \n }\n};\n\n/**\n * Your Robot object will be instantiated and called as such:\n * Robot* obj = new Robot(width, height);\n * obj->step(num);\n * vector<int> param_2 = obj->getPos();\n * string param_3 = obj->getDir();\n */",
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"code": "class Robot {\n\n public Robot(int width, int height) {\n \n }\n \n public void step(int num) {\n \n }\n \n public int[] getPos() {\n \n }\n \n public String getDir() {\n \n }\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * Robot obj = new Robot(width, height);\n * obj.step(num);\n * int[] param_2 = obj.getPos();\n * String param_3 = obj.getDir();\n */",
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"code": "class Robot(object):\n\n def __init__(self, width, height):\n \"\"\"\n :type width: int\n :type height: int\n \"\"\"\n \n\n def step(self, num):\n \"\"\"\n :type num: int\n :rtype: None\n \"\"\"\n \n\n def getPos(self):\n \"\"\"\n :rtype: List[int]\n \"\"\"\n \n\n def getDir(self):\n \"\"\"\n :rtype: str\n \"\"\"\n \n\n\n# Your Robot object will be instantiated and called as such:\n# obj = Robot(width, height)\n# obj.step(num)\n# param_2 = obj.getPos()\n# param_3 = obj.getDir()",
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"code": "class Robot:\n\n def __init__(self, width: int, height: int):\n \n\n def step(self, num: int) -> None:\n \n\n def getPos(self) -> List[int]:\n \n\n def getDir(self) -> str:\n \n\n\n# Your Robot object will be instantiated and called as such:\n# obj = Robot(width, height)\n# obj.step(num)\n# param_2 = obj.getPos()\n# param_3 = obj.getDir()",
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"code": "\n\n\ntypedef struct {\n \n} Robot;\n\n\nRobot* robotCreate(int width, int height) {\n \n}\n\nvoid robotStep(Robot* obj, int num) {\n \n}\n\nint* robotGetPos(Robot* obj, int* retSize) {\n \n}\n\nchar * robotGetDir(Robot* obj) {\n \n}\n\nvoid robotFree(Robot* obj) {\n \n}\n\n/**\n * Your Robot struct will be instantiated and called as such:\n * Robot* obj = robotCreate(width, height);\n * robotStep(obj, num);\n \n * int* param_2 = robotGetPos(obj, retSize);\n \n * char * param_3 = robotGetDir(obj);\n \n * robotFree(obj);\n*/",
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"langSlug": "csharp",
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"code": "public class Robot {\n\n public Robot(int width, int height) {\n \n }\n \n public void Step(int num) {\n \n }\n \n public int[] GetPos() {\n \n }\n \n public string GetDir() {\n \n }\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * Robot obj = new Robot(width, height);\n * obj.Step(num);\n * int[] param_2 = obj.GetPos();\n * string param_3 = obj.GetDir();\n */",
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"code": "/**\n * @param {number} width\n * @param {number} height\n */\nvar Robot = function(width, height) {\n \n};\n\n/** \n * @param {number} num\n * @return {void}\n */\nRobot.prototype.step = function(num) {\n \n};\n\n/**\n * @return {number[]}\n */\nRobot.prototype.getPos = function() {\n \n};\n\n/**\n * @return {string}\n */\nRobot.prototype.getDir = function() {\n \n};\n\n/** \n * Your Robot object will be instantiated and called as such:\n * var obj = new Robot(width, height)\n * obj.step(num)\n * var param_2 = obj.getPos()\n * var param_3 = obj.getDir()\n */",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "class Robot\n\n=begin\n :type width: Integer\n :type height: Integer\n=end\n def initialize(width, height)\n \n end\n\n\n=begin\n :type num: Integer\n :rtype: Void\n=end\n def step(num)\n \n end\n\n\n=begin\n :rtype: Integer[]\n=end\n def get_pos()\n \n end\n\n\n=begin\n :rtype: String\n=end\n def get_dir()\n \n end\n\n\nend\n\n# Your Robot object will be instantiated and called as such:\n# obj = Robot.new(width, height)\n# obj.step(num)\n# param_2 = obj.get_pos()\n# param_3 = obj.get_dir()",
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"lang": "Swift",
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"code": "\nclass Robot {\n\n init(_ width: Int, _ height: Int) {\n \n }\n \n func step(_ num: Int) {\n \n }\n \n func getPos() -> [Int] {\n \n }\n \n func getDir() -> String {\n \n }\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * let obj = Robot(width, height)\n * obj.step(num)\n * let ret_2: [Int] = obj.getPos()\n * let ret_3: String = obj.getDir()\n */",
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"lang": "Go",
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"langSlug": "golang",
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"code": "type Robot struct {\n \n}\n\n\nfunc Constructor(width int, height int) Robot {\n \n}\n\n\nfunc (this *Robot) Step(num int) {\n \n}\n\n\nfunc (this *Robot) GetPos() []int {\n \n}\n\n\nfunc (this *Robot) GetDir() string {\n \n}\n\n\n/**\n * Your Robot object will be instantiated and called as such:\n * obj := Constructor(width, height);\n * obj.Step(num);\n * param_2 := obj.GetPos();\n * param_3 := obj.GetDir();\n */",
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"lang": "Scala",
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"code": "class Robot(_width: Int, _height: Int) {\n\n def step(num: Int) {\n \n }\n\n def getPos(): Array[Int] = {\n \n }\n\n def getDir(): String = {\n \n }\n\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * var obj = new Robot(width, height)\n * obj.step(num)\n * var param_2 = obj.getPos()\n * var param_3 = obj.getDir()\n */",
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Robot(width: Int, height: Int) {\n\n fun step(num: Int) {\n \n }\n\n fun getPos(): IntArray {\n \n }\n\n fun getDir(): String {\n \n }\n\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * var obj = Robot(width, height)\n * obj.step(num)\n * var param_2 = obj.getPos()\n * var param_3 = obj.getDir()\n */",
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"__typename": "CodeSnippetNode"
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"lang": "Rust",
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"langSlug": "rust",
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"code": "struct Robot {\n\n}\n\n\n/** \n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl Robot {\n\n fn new(width: i32, height: i32) -> Self {\n \n }\n \n fn step(&self, num: i32) {\n \n }\n \n fn get_pos(&self) -> Vec<i32> {\n \n }\n \n fn get_dir(&self) -> String {\n \n }\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * let obj = Robot::new(width, height);\n * obj.step(num);\n * let ret_2: Vec<i32> = obj.get_pos();\n * let ret_3: String = obj.get_dir();\n */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "PHP",
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"langSlug": "php",
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"code": "class Robot {\n /**\n * @param Integer $width\n * @param Integer $height\n */\n function __construct($width, $height) {\n \n }\n \n /**\n * @param Integer $num\n * @return NULL\n */\n function step($num) {\n \n }\n \n /**\n * @return Integer[]\n */\n function getPos() {\n \n }\n \n /**\n * @return String\n */\n function getDir() {\n \n }\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * $obj = Robot($width, $height);\n * $obj->step($num);\n * $ret_2 = $obj->getPos();\n * $ret_3 = $obj->getDir();\n */",
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"lang": "TypeScript",
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"code": "class Robot {\n constructor(width: number, height: number) {\n\n }\n\n step(num: number): void {\n\n }\n\n getPos(): number[] {\n\n }\n\n getDir(): string {\n\n }\n}\n\n/**\n * Your Robot object will be instantiated and called as such:\n * var obj = new Robot(width, height)\n * obj.step(num)\n * var param_2 = obj.getPos()\n * var param_3 = obj.getDir()\n */",
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define robot%\n (class object%\n (super-new)\n \n ; width : exact-integer?\n ; height : exact-integer?\n (init-field\n width\n height)\n \n ; step : exact-integer? -> void?\n (define/public (step num)\n\n )\n ; get-pos : -> (listof exact-integer?)\n (define/public (get-pos)\n\n )\n ; get-dir : -> string?\n (define/public (get-dir)\n\n )))\n\n;; Your robot% object will be instantiated and called as such:\n;; (define obj (new robot% [width width] [height height]))\n;; (send obj step num)\n;; (define param_2 (send obj get-pos))\n;; (define param_3 (send obj get-dir))",
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"code": "-spec robot_init_(Width :: integer(), Height :: integer()) -> any().\nrobot_init_(Width, Height) ->\n .\n\n-spec robot_step(Num :: integer()) -> any().\nrobot_step(Num) ->\n .\n\n-spec robot_get_pos() -> [integer()].\nrobot_get_pos() ->\n .\n\n-spec robot_get_dir() -> unicode:unicode_binary().\nrobot_get_dir() ->\n .\n\n\n%% Your functions will be called as such:\n%% robot_init_(Width, Height),\n%% robot_step(Num),\n%% Param_2 = robot_get_pos(),\n%% Param_3 = robot_get_dir(),\n\n%% robot_init_ will be called before every test case, in which you can do some necessary initializations.",
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"code": "defmodule Robot do\n @spec init_(width :: integer, height :: integer) :: any\n def init_(width, height) do\n\n end\n\n @spec step(num :: integer) :: any\n def step(num) do\n\n end\n\n @spec get_pos() :: [integer]\n def get_pos() do\n\n end\n\n @spec get_dir() :: String.t\n def get_dir() do\n\n end\nend\n\n# Your functions will be called as such:\n# Robot.init_(width, height)\n# Robot.step(num)\n# param_2 = Robot.get_pos()\n# param_3 = Robot.get_dir()\n\n# Robot.init_ will be called before every test case, in which you can do some necessary initializations.",
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"hints": [
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"The robot only moves along the perimeter of the grid. Can you think if modulus can help you quickly compute which cell it stops at?",
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"After the robot moves one time, whenever the robot stops at some cell, it will always face a specific direction. i.e., The direction it faces is determined by the cell it stops at.",
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"Can you precompute what direction it faces when it stops at each cell along the perimeter, and reuse the results?"
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],
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"sampleTestCase": "[\"Robot\",\"step\",\"step\",\"getPos\",\"getDir\",\"step\",\"step\",\"step\",\"getPos\",\"getDir\"]\n[[6,3],[2],[2],[],[],[2],[1],[4],[],[]]",
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"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code> OpenJDK 17 </code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu99 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n int id; /* we'll use this field as the key */\\r\\n char name[10];\\r\\n UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n struct hash_entry *s;\\r\\n HASH_FIND_INT(users, &user_id, s);\\r\\n return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\\r\\n\\r\\n<p>Your code is compiled with debug flag enabled (<code>/debug</code>).</p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use <a href=\\\"https://github.com/datastructures-js/priority-queue\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and <a href=\\\"https://github.com/datastructures-js/queue\\\" target=\\\"_blank\\\">datastructures-js/queue</a>.</p>\"], \"ruby\": [\"Ruby\", \"<p><code>Ruby 3.1</code></p>\\r\\n\\r\\n<p>Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms</p>\"], \"swift\": [\"Swift\", \"<p><code>Swift 5.5.2</code>.</p>\"], \"golang\": [\"Go\", \"<p><code>Go 1.17.6</code>.</p>\\r\\n\\r\\n<p>Support <a href=\\\"https://godoc.org/github.com/emirpasic/gods\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods</a> library.</p>\"], \"python3\": [\"Python3\", \"<p><code>Python 3.10</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/3/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/3/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/3/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\"], \"scala\": [\"Scala\", \"<p><code>Scala 2.13.7</code>.</p>\"], \"kotlin\": [\"Kotlin\", \"<p><code>Kotlin 1.3.10</code>.</p>\"], \"rust\": [\"Rust\", \"<p><code>Rust 1.58.1</code></p>\\r\\n\\r\\n<p>Supports <a href=\\\"https://crates.io/crates/rand\\\" target=\\\"_blank\\\">rand </a> v0.6\\u00a0from crates.io</p>\"], \"php\": [\"PHP\", \"<p><code>PHP 8.1</code>.</p>\\r\\n<p>With bcmath module</p>\"], \"typescript\": [\"Typescript\", \"<p><code>TypeScript 4.5.4, Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES2020 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\"], \"racket\": [\"Racket\", \"<p>Run with <code>Racket 8.3</code>.</p>\"], \"erlang\": [\"Erlang\", \"Erlang/OTP 24.2\"], \"elixir\": [\"Elixir\", \"Elixir 1.13.0 with Erlang/OTP 24.2\"]}",
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