mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
174 lines
25 KiB
JSON
174 lines
25 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1582",
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"questionFrontendId": "1472",
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"boundTopicId": null,
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"title": "Design Browser History",
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"titleSlug": "design-browser-history",
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"content": "<p>You have a <strong>browser</strong> of one tab where you start on the <code>homepage</code> and you can visit another <code>url</code>, get back in the history number of <code>steps</code> or move forward in the history number of <code>steps</code>.</p>\n\n<p>Implement the <code>BrowserHistory</code> class:</p>\n\n<ul>\n\t<li><code>BrowserHistory(string homepage)</code> Initializes the object with the <code>homepage</code> of the browser.</li>\n\t<li><code>void visit(string url)</code> Visits <code>url</code> from the current page. It clears up all the forward history.</li>\n\t<li><code>string back(int steps)</code> Move <code>steps</code> back in history. If you can only return <code>x</code> steps in the history and <code>steps > x</code>, you will return only <code>x</code> steps. Return the current <code>url</code> after moving back in history <strong>at most</strong> <code>steps</code>.</li>\n\t<li><code>string forward(int steps)</code> Move <code>steps</code> forward in history. If you can only forward <code>x</code> steps in the history and <code>steps > x</code>, you will forward only <code>x</code> steps. Return the current <code>url</code> after forwarding in history <strong>at most</strong> <code>steps</code>.</li>\n</ul>\n\n<p> </p>\n<p><strong>Example:</strong></p>\n\n<pre>\n<b>Input:</b>\n["BrowserHistory","visit","visit","visit","back","back","forward","visit","forward","back","back"]\n[["leetcode.com"],["google.com"],["facebook.com"],["youtube.com"],[1],[1],[1],["linkedin.com"],[2],[2],[7]]\n<b>Output:</b>\n[null,null,null,null,"facebook.com","google.com","facebook.com",null,"linkedin.com","google.com","leetcode.com"]\n\n<b>Explanation:</b>\nBrowserHistory browserHistory = new BrowserHistory("leetcode.com");\nbrowserHistory.visit("google.com"); // You are in "leetcode.com". Visit "google.com"\nbrowserHistory.visit("facebook.com"); // You are in "google.com". Visit "facebook.com"\nbrowserHistory.visit("youtube.com"); // You are in "facebook.com". Visit "youtube.com"\nbrowserHistory.back(1); // You are in "youtube.com", move back to "facebook.com" return "facebook.com"\nbrowserHistory.back(1); // You are in "facebook.com", move back to "google.com" return "google.com"\nbrowserHistory.forward(1); // You are in "google.com", move forward to "facebook.com" return "facebook.com"\nbrowserHistory.visit("linkedin.com"); // You are in "facebook.com". Visit "linkedin.com"\nbrowserHistory.forward(2); // You are in "linkedin.com", you cannot move forward any steps.\nbrowserHistory.back(2); // You are in "linkedin.com", move back two steps to "facebook.com" then to "google.com". return "google.com"\nbrowserHistory.back(7); // You are in "google.com", you can move back only one step to "leetcode.com". return "leetcode.com"\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= homepage.length <= 20</code></li>\n\t<li><code>1 <= url.length <= 20</code></li>\n\t<li><code>1 <= steps <= 100</code></li>\n\t<li><code>homepage</code> and <code>url</code> consist of '.' or lower case English letters.</li>\n\t<li>At most <code>5000</code> calls will be made to <code>visit</code>, <code>back</code>, and <code>forward</code>.</li>\n</ul>\n",
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"translatedTitle": null,
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 1260,
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"exampleTestcases": "[\"BrowserHistory\",\"visit\",\"visit\",\"visit\",\"back\",\"back\",\"forward\",\"visit\",\"forward\",\"back\",\"back\"]\r\n[[\"leetcode.com\"],[\"google.com\"],[\"facebook.com\"],[\"youtube.com\"],[1],[1],[1],[\"linkedin.com\"],[2],[2],[7]]\r",
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"categoryTitle": "Algorithms",
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"contributors": [],
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"topicTags": [
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{
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"name": "Array",
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"slug": "array",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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{
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"name": "Linked List",
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"slug": "linked-list",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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"name": "Stack",
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"name": "Design",
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"name": "Doubly-Linked List",
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"__typename": "TopicTagNode"
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"name": "Data Stream",
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{
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class BrowserHistory {\npublic:\n BrowserHistory(string homepage) {\n \n }\n \n void visit(string url) {\n \n }\n \n string back(int steps) {\n \n }\n \n string forward(int steps) {\n \n }\n};\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * BrowserHistory* obj = new BrowserHistory(homepage);\n * obj->visit(url);\n * string param_2 = obj->back(steps);\n * string param_3 = obj->forward(steps);\n */",
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{
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"lang": "Java",
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"langSlug": "java",
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"code": "class BrowserHistory {\n\n public BrowserHistory(String homepage) {\n \n }\n \n public void visit(String url) {\n \n }\n \n public String back(int steps) {\n \n }\n \n public String forward(int steps) {\n \n }\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * BrowserHistory obj = new BrowserHistory(homepage);\n * obj.visit(url);\n * String param_2 = obj.back(steps);\n * String param_3 = obj.forward(steps);\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Python",
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"langSlug": "python",
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"code": "class BrowserHistory(object):\n\n def __init__(self, homepage):\n \"\"\"\n :type homepage: str\n \"\"\"\n \n\n def visit(self, url):\n \"\"\"\n :type url: str\n :rtype: None\n \"\"\"\n \n\n def back(self, steps):\n \"\"\"\n :type steps: int\n :rtype: str\n \"\"\"\n \n\n def forward(self, steps):\n \"\"\"\n :type steps: int\n :rtype: str\n \"\"\"\n \n\n\n# Your BrowserHistory object will be instantiated and called as such:\n# obj = BrowserHistory(homepage)\n# obj.visit(url)\n# param_2 = obj.back(steps)\n# param_3 = obj.forward(steps)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Python3",
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"langSlug": "python3",
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"code": "class BrowserHistory:\n\n def __init__(self, homepage: str):\n \n\n def visit(self, url: str) -> None:\n \n\n def back(self, steps: int) -> str:\n \n\n def forward(self, steps: int) -> str:\n \n\n\n# Your BrowserHistory object will be instantiated and called as such:\n# obj = BrowserHistory(homepage)\n# obj.visit(url)\n# param_2 = obj.back(steps)\n# param_3 = obj.forward(steps)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "C",
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"langSlug": "c",
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"code": "\n\n\ntypedef struct {\n \n} BrowserHistory;\n\n\nBrowserHistory* browserHistoryCreate(char * homepage) {\n \n}\n\nvoid browserHistoryVisit(BrowserHistory* obj, char * url) {\n \n}\n\nchar * browserHistoryBack(BrowserHistory* obj, int steps) {\n \n}\n\nchar * browserHistoryForward(BrowserHistory* obj, int steps) {\n \n}\n\nvoid browserHistoryFree(BrowserHistory* obj) {\n \n}\n\n/**\n * Your BrowserHistory struct will be instantiated and called as such:\n * BrowserHistory* obj = browserHistoryCreate(homepage);\n * browserHistoryVisit(obj, url);\n \n * char * param_2 = browserHistoryBack(obj, steps);\n \n * char * param_3 = browserHistoryForward(obj, steps);\n \n * browserHistoryFree(obj);\n*/",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class BrowserHistory {\n\n public BrowserHistory(string homepage) {\n \n }\n \n public void Visit(string url) {\n \n }\n \n public string Back(int steps) {\n \n }\n \n public string Forward(int steps) {\n \n }\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * BrowserHistory obj = new BrowserHistory(homepage);\n * obj.Visit(url);\n * string param_2 = obj.Back(steps);\n * string param_3 = obj.Forward(steps);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "/**\n * @param {string} homepage\n */\nvar BrowserHistory = function(homepage) {\n \n};\n\n/** \n * @param {string} url\n * @return {void}\n */\nBrowserHistory.prototype.visit = function(url) {\n \n};\n\n/** \n * @param {number} steps\n * @return {string}\n */\nBrowserHistory.prototype.back = function(steps) {\n \n};\n\n/** \n * @param {number} steps\n * @return {string}\n */\nBrowserHistory.prototype.forward = function(steps) {\n \n};\n\n/** \n * Your BrowserHistory object will be instantiated and called as such:\n * var obj = new BrowserHistory(homepage)\n * obj.visit(url)\n * var param_2 = obj.back(steps)\n * var param_3 = obj.forward(steps)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "class BrowserHistory\n\n=begin\n :type homepage: String\n=end\n def initialize(homepage)\n \n end\n\n\n=begin\n :type url: String\n :rtype: Void\n=end\n def visit(url)\n \n end\n\n\n=begin\n :type steps: Integer\n :rtype: String\n=end\n def back(steps)\n \n end\n\n\n=begin\n :type steps: Integer\n :rtype: String\n=end\n def forward(steps)\n \n end\n\n\nend\n\n# Your BrowserHistory object will be instantiated and called as such:\n# obj = BrowserHistory.new(homepage)\n# obj.visit(url)\n# param_2 = obj.back(steps)\n# param_3 = obj.forward(steps)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Swift",
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"langSlug": "swift",
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"code": "\nclass BrowserHistory {\n\n init(_ homepage: String) {\n \n }\n \n func visit(_ url: String) {\n \n }\n \n func back(_ steps: Int) -> String {\n \n }\n \n func forward(_ steps: Int) -> String {\n \n }\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * let obj = BrowserHistory(homepage)\n * obj.visit(url)\n * let ret_2: String = obj.back(steps)\n * let ret_3: String = obj.forward(steps)\n */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "Go",
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"langSlug": "golang",
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"code": "type BrowserHistory struct {\n \n}\n\n\nfunc Constructor(homepage string) BrowserHistory {\n \n}\n\n\nfunc (this *BrowserHistory) Visit(url string) {\n \n}\n\n\nfunc (this *BrowserHistory) Back(steps int) string {\n \n}\n\n\nfunc (this *BrowserHistory) Forward(steps int) string {\n \n}\n\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * obj := Constructor(homepage);\n * obj.Visit(url);\n * param_2 := obj.Back(steps);\n * param_3 := obj.Forward(steps);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Scala",
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"langSlug": "scala",
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"code": "class BrowserHistory(_homepage: String) {\n\n def visit(url: String) {\n \n }\n\n def back(steps: Int): String = {\n \n }\n\n def forward(steps: Int): String = {\n \n }\n\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * var obj = new BrowserHistory(homepage)\n * obj.visit(url)\n * var param_2 = obj.back(steps)\n * var param_3 = obj.forward(steps)\n */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class BrowserHistory(homepage: String) {\n\n fun visit(url: String) {\n \n }\n\n fun back(steps: Int): String {\n \n }\n\n fun forward(steps: Int): String {\n \n }\n\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * var obj = BrowserHistory(homepage)\n * obj.visit(url)\n * var param_2 = obj.back(steps)\n * var param_3 = obj.forward(steps)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Rust",
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"langSlug": "rust",
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"code": "struct BrowserHistory {\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 BrowserHistory {\n\n fn new(homepage: String) -> Self {\n \n }\n \n fn visit(&self, url: String) {\n \n }\n \n fn back(&self, steps: i32) -> String {\n \n }\n \n fn forward(&self, steps: i32) -> String {\n \n }\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * let obj = BrowserHistory::new(homepage);\n * obj.visit(url);\n * let ret_2: String = obj.back(steps);\n * let ret_3: String = obj.forward(steps);\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 BrowserHistory {\n /**\n * @param String $homepage\n */\n function __construct($homepage) {\n \n }\n \n /**\n * @param String $url\n * @return NULL\n */\n function visit($url) {\n \n }\n \n /**\n * @param Integer $steps\n * @return String\n */\n function back($steps) {\n \n }\n \n /**\n * @param Integer $steps\n * @return String\n */\n function forward($steps) {\n \n }\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * $obj = BrowserHistory($homepage);\n * $obj->visit($url);\n * $ret_2 = $obj->back($steps);\n * $ret_3 = $obj->forward($steps);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "class BrowserHistory {\n constructor(homepage: string) {\n\n }\n\n visit(url: string): void {\n\n }\n\n back(steps: number): string {\n\n }\n\n forward(steps: number): string {\n\n }\n}\n\n/**\n * Your BrowserHistory object will be instantiated and called as such:\n * var obj = new BrowserHistory(homepage)\n * obj.visit(url)\n * var param_2 = obj.back(steps)\n * var param_3 = obj.forward(steps)\n */",
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"__typename": "CodeSnippetNode"
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}
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],
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"stats": "{\"totalAccepted\": \"74.4K\", \"totalSubmission\": \"99.3K\", \"totalAcceptedRaw\": 74399, \"totalSubmissionRaw\": 99283, \"acRate\": \"74.9%\"}",
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"hints": [
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"Use two stack one for back history and one for forward history and simulate the functions.",
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"Can you do faster by using different data structure ?"
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "[\"BrowserHistory\",\"visit\",\"visit\",\"visit\",\"back\",\"back\",\"forward\",\"visit\",\"forward\",\"back\",\"back\"]\r\n[[\"leetcode.com\"],[\"google.com\"],[\"facebook.com\"],[\"youtube.com\"],[1],[1],[1],[\"linkedin.com\"],[2],[2],[7]]\r",
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"metaData": "{\n \"classname\": \"BrowserHistory\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"homepage\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"url\"\n }\n ],\n \"name\": \"visit\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"steps\"\n }\n ],\n \"name\": \"back\",\n \"return\": {\n \"type\": \"string\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"steps\"\n }\n ],\n \"name\": \"forward\",\n \"return\": {\n \"type\": \"string\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}",
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"judgerAvailable": true,
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"judgeType": "large",
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"mysqlSchemas": [],
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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>\"]}",
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