mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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192 lines
29 KiB
JSON
192 lines
29 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1433",
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"questionFrontendId": "2227",
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"boundTopicId": null,
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"title": "Encrypt and Decrypt Strings",
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"titleSlug": "encrypt-and-decrypt-strings",
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"content": "<p>You are given a character array <code>keys</code> containing <strong>unique</strong> characters and a string array <code>values</code> containing strings of length 2. You are also given another string array <code>dictionary</code> that contains all permitted original strings after decryption. You should implement a data structure that can encrypt or decrypt a <strong>0-indexed</strong> string.</p>\n\n<p>A string is <strong>encrypted</strong> with the following process:</p>\n\n<ol>\n\t<li>For each character <code>c</code> in the string, we find the index <code>i</code> satisfying <code>keys[i] == c</code> in <code>keys</code>.</li>\n\t<li>Replace <code>c</code> with <code>values[i]</code> in the string.</li>\n</ol>\n\n<p>Note that in case a character of the string is <strong>not present</strong> in <code>keys</code>, the encryption process cannot be carried out, and an empty string <code>""</code> is returned.</p>\n\n<p>A string is <strong>decrypted</strong> with the following process:</p>\n\n<ol>\n\t<li>For each substring <code>s</code> of length 2 occurring at an even index in the string, we find an <code>i</code> such that <code>values[i] == s</code>. If there are multiple valid <code>i</code>, we choose <strong>any</strong> one of them. This means a string could have multiple possible strings it can decrypt to.</li>\n\t<li>Replace <code>s</code> with <code>keys[i]</code> in the string.</li>\n</ol>\n\n<p>Implement the <code>Encrypter</code> class:</p>\n\n<ul>\n\t<li><code>Encrypter(char[] keys, String[] values, String[] dictionary)</code> Initializes the <code>Encrypter</code> class with <code>keys, values</code>, and <code>dictionary</code>.</li>\n\t<li><code>String encrypt(String word1)</code> Encrypts <code>word1</code> with the encryption process described above and returns the encrypted string.</li>\n\t<li><code>int decrypt(String word2)</code> Returns the number of possible strings <code>word2</code> could decrypt to that also appear in <code>dictionary</code>.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["Encrypter", "encrypt", "decrypt"]\n[[['a', 'b', 'c', 'd'], ["ei", "zf", "ei", "am"], ["abcd", "acbd", "adbc", "badc", "dacb", "cadb", "cbda", "abad"]], ["abcd"], ["eizfeiam"]]\n<strong>Output</strong>\n[null, "eizfeiam", 2]\n\n<strong>Explanation</strong>\nEncrypter encrypter = new Encrypter([['a', 'b', 'c', 'd'], ["ei", "zf", "ei", "am"], ["abcd", "acbd", "adbc", "badc", "dacb", "cadb", "cbda", "abad"]);\nencrypter.encrypt("abcd"); // return "eizfeiam". \n // 'a' maps to "ei", 'b' maps to "zf", 'c' maps to "ei", and 'd' maps to "am".\nencrypter.decrypt("eizfeiam"); // return 2. \n // "ei" can map to 'a' or 'c', "zf" maps to 'b', and "am" maps to 'd'. \n // Thus, the possible strings after decryption are "abad", "cbad", "abcd", and "cbcd". \n // 2 of those strings, "abad" and "abcd", appear in dictionary, so the answer is 2.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= keys.length == values.length <= 26</code></li>\n\t<li><code>values[i].length == 2</code></li>\n\t<li><code>1 <= dictionary.length <= 100</code></li>\n\t<li><code>1 <= dictionary[i].length <= 100</code></li>\n\t<li>All <code>keys[i]</code> and <code>dictionary[i]</code> are <strong>unique</strong>.</li>\n\t<li><code>1 <= word1.length <= 2000</code></li>\n\t<li><code>1 <= word2.length <= 200</code></li>\n\t<li>All <code>word1[i]</code> appear in <code>keys</code>.</li>\n\t<li><code>word2.length</code> is even.</li>\n\t<li><code>keys</code>, <code>values[i]</code>, <code>dictionary[i]</code>, <code>word1</code>, and <code>word2</code> only contain lowercase English letters.</li>\n\t<li>At most <code>200</code> calls will be made to <code>encrypt</code> and <code>decrypt</code> <strong>in total</strong>.</li>\n</ul>\n",
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"difficulty": "Hard",
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"likes": 314,
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"similarQuestions": "[{\"title\": \"Implement Trie (Prefix Tree)\", \"titleSlug\": \"implement-trie-prefix-tree\", \"difficulty\": \"Medium\", \"translatedTitle\": null}, {\"title\": \"Word Search II\", \"titleSlug\": \"word-search-ii\", \"difficulty\": \"Hard\", \"translatedTitle\": null}, {\"title\": \"Implement Trie II (Prefix Tree)\", \"titleSlug\": \"implement-trie-ii-prefix-tree\", \"difficulty\": \"Medium\", \"translatedTitle\": null}]",
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"exampleTestcases": "[\"Encrypter\",\"encrypt\",\"decrypt\"]\n[[[\"a\",\"b\",\"c\",\"d\"],[\"ei\",\"zf\",\"ei\",\"am\"],[\"abcd\",\"acbd\",\"adbc\",\"badc\",\"dacb\",\"cadb\",\"cbda\",\"abad\"]],[\"abcd\"],[\"eizfeiam\"]]",
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"categoryTitle": "Algorithms",
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class Encrypter {\npublic:\n Encrypter(vector<char>& keys, vector<string>& values, vector<string>& dictionary) {\n \n }\n \n string encrypt(string word1) {\n \n }\n \n int decrypt(string word2) {\n \n }\n};\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * Encrypter* obj = new Encrypter(keys, values, dictionary);\n * string param_1 = obj->encrypt(word1);\n * int param_2 = obj->decrypt(word2);\n */",
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"lang": "Java",
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"code": "class Encrypter {\n\n public Encrypter(char[] keys, String[] values, String[] dictionary) {\n \n }\n \n public String encrypt(String word1) {\n \n }\n \n public int decrypt(String word2) {\n \n }\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * Encrypter obj = new Encrypter(keys, values, dictionary);\n * String param_1 = obj.encrypt(word1);\n * int param_2 = obj.decrypt(word2);\n */",
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"lang": "Python",
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"code": "class Encrypter(object):\n\n def __init__(self, keys, values, dictionary):\n \"\"\"\n :type keys: List[str]\n :type values: List[str]\n :type dictionary: List[str]\n \"\"\"\n \n\n def encrypt(self, word1):\n \"\"\"\n :type word1: str\n :rtype: str\n \"\"\"\n \n\n def decrypt(self, word2):\n \"\"\"\n :type word2: str\n :rtype: int\n \"\"\"\n \n\n\n# Your Encrypter object will be instantiated and called as such:\n# obj = Encrypter(keys, values, dictionary)\n# param_1 = obj.encrypt(word1)\n# param_2 = obj.decrypt(word2)",
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"lang": "Python3",
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"code": "class Encrypter:\n\n def __init__(self, keys: List[str], values: List[str], dictionary: List[str]):\n \n\n def encrypt(self, word1: str) -> str:\n \n\n def decrypt(self, word2: str) -> int:\n \n\n\n# Your Encrypter object will be instantiated and called as such:\n# obj = Encrypter(keys, values, dictionary)\n# param_1 = obj.encrypt(word1)\n# param_2 = obj.decrypt(word2)",
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"lang": "C",
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"langSlug": "c",
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"code": "\n\n\ntypedef struct {\n \n} Encrypter;\n\n\nEncrypter* encrypterCreate(char* keys, int keysSize, char** values, int valuesSize, char** dictionary, int dictionarySize) {\n \n}\n\nchar* encrypterEncrypt(Encrypter* obj, char* word1) {\n \n}\n\nint encrypterDecrypt(Encrypter* obj, char* word2) {\n \n}\n\nvoid encrypterFree(Encrypter* obj) {\n \n}\n\n/**\n * Your Encrypter struct will be instantiated and called as such:\n * Encrypter* obj = encrypterCreate(keys, keysSize, values, valuesSize, dictionary, dictionarySize);\n * char* param_1 = encrypterEncrypt(obj, word1);\n \n * int param_2 = encrypterDecrypt(obj, word2);\n \n * encrypterFree(obj);\n*/",
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class Encrypter {\n\n public Encrypter(char[] keys, string[] values, string[] dictionary) {\n \n }\n \n public string Encrypt(string word1) {\n \n }\n \n public int Decrypt(string word2) {\n \n }\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * Encrypter obj = new Encrypter(keys, values, dictionary);\n * string param_1 = obj.Encrypt(word1);\n * int param_2 = obj.Decrypt(word2);\n */",
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "/**\n * @param {character[]} keys\n * @param {string[]} values\n * @param {string[]} dictionary\n */\nvar Encrypter = function(keys, values, dictionary) {\n \n};\n\n/** \n * @param {string} word1\n * @return {string}\n */\nEncrypter.prototype.encrypt = function(word1) {\n \n};\n\n/** \n * @param {string} word2\n * @return {number}\n */\nEncrypter.prototype.decrypt = function(word2) {\n \n};\n\n/** \n * Your Encrypter object will be instantiated and called as such:\n * var obj = new Encrypter(keys, values, dictionary)\n * var param_1 = obj.encrypt(word1)\n * var param_2 = obj.decrypt(word2)\n */",
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "class Encrypter {\n constructor(keys: string[], values: string[], dictionary: string[]) {\n \n }\n\n encrypt(word1: string): string {\n \n }\n\n decrypt(word2: string): number {\n \n }\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * var obj = new Encrypter(keys, values, dictionary)\n * var param_1 = obj.encrypt(word1)\n * var param_2 = obj.decrypt(word2)\n */",
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"lang": "PHP",
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"langSlug": "php",
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"code": "class Encrypter {\n /**\n * @param String[] $keys\n * @param String[] $values\n * @param String[] $dictionary\n */\n function __construct($keys, $values, $dictionary) {\n \n }\n \n /**\n * @param String $word1\n * @return String\n */\n function encrypt($word1) {\n \n }\n \n /**\n * @param String $word2\n * @return Integer\n */\n function decrypt($word2) {\n \n }\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * $obj = Encrypter($keys, $values, $dictionary);\n * $ret_1 = $obj->encrypt($word1);\n * $ret_2 = $obj->decrypt($word2);\n */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "Swift",
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"langSlug": "swift",
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"code": "\nclass Encrypter {\n\n init(_ keys: [Character], _ values: [String], _ dictionary: [String]) {\n \n }\n \n func encrypt(_ word1: String) -> String {\n \n }\n \n func decrypt(_ word2: String) -> Int {\n \n }\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * let obj = Encrypter(keys, values, dictionary)\n * let ret_1: String = obj.encrypt(word1)\n * let ret_2: Int = obj.decrypt(word2)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Encrypter(keys: CharArray, values: Array<String>, dictionary: Array<String>) {\n\n fun encrypt(word1: String): String {\n \n }\n\n fun decrypt(word2: String): Int {\n \n }\n\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * var obj = Encrypter(keys, values, dictionary)\n * var param_1 = obj.encrypt(word1)\n * var param_2 = obj.decrypt(word2)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Dart",
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"langSlug": "dart",
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"code": "class Encrypter {\n\n Encrypter(List<String> keys, List<String> values, List<String> dictionary) {\n \n }\n \n String encrypt(String word1) {\n \n }\n \n int decrypt(String word2) {\n \n }\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * Encrypter obj = Encrypter(keys, values, dictionary);\n * String param1 = obj.encrypt(word1);\n * int param2 = obj.decrypt(word2);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Go",
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"langSlug": "golang",
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"code": "type Encrypter struct {\n \n}\n\n\nfunc Constructor(keys []byte, values []string, dictionary []string) Encrypter {\n \n}\n\n\nfunc (this *Encrypter) Encrypt(word1 string) string {\n \n}\n\n\nfunc (this *Encrypter) Decrypt(word2 string) int {\n \n}\n\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * obj := Constructor(keys, values, dictionary);\n * param_1 := obj.Encrypt(word1);\n * param_2 := obj.Decrypt(word2);\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 Encrypter\n\n=begin\n :type keys: Character[]\n :type values: String[]\n :type dictionary: String[]\n=end\n def initialize(keys, values, dictionary)\n \n end\n\n\n=begin\n :type word1: String\n :rtype: String\n=end\n def encrypt(word1)\n \n end\n\n\n=begin\n :type word2: String\n :rtype: Integer\n=end\n def decrypt(word2)\n \n end\n\n\nend\n\n# Your Encrypter object will be instantiated and called as such:\n# obj = Encrypter.new(keys, values, dictionary)\n# param_1 = obj.encrypt(word1)\n# param_2 = obj.decrypt(word2)",
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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 Encrypter(_keys: Array[Char], _values: Array[String], _dictionary: Array[String]) {\n\n def encrypt(word1: String): String = {\n \n }\n\n def decrypt(word2: String): Int = {\n \n }\n\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * var obj = new Encrypter(keys, values, dictionary)\n * var param_1 = obj.encrypt(word1)\n * var param_2 = obj.decrypt(word2)\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 Encrypter {\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 Encrypter {\n\n fn new(keys: Vec<char>, values: Vec<String>, dictionary: Vec<String>) -> Self {\n \n }\n \n fn encrypt(&self, word1: String) -> String {\n \n }\n \n fn decrypt(&self, word2: String) -> i32 {\n \n }\n}\n\n/**\n * Your Encrypter object will be instantiated and called as such:\n * let obj = Encrypter::new(keys, values, dictionary);\n * let ret_1: String = obj.encrypt(word1);\n * let ret_2: i32 = obj.decrypt(word2);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define encrypter%\n (class object%\n (super-new)\n \n ; keys : (listof char?)\n ; values : (listof string?)\n ; dictionary : (listof string?)\n (init-field\n keys\n values\n dictionary)\n \n ; encrypt : string? -> string?\n (define/public (encrypt word1)\n )\n ; decrypt : string? -> exact-integer?\n (define/public (decrypt word2)\n )))\n\n;; Your encrypter% object will be instantiated and called as such:\n;; (define obj (new encrypter% [keys keys] [values values] [dictionary dictionary]))\n;; (define param_1 (send obj encrypt word1))\n;; (define param_2 (send obj decrypt word2))",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec encrypter_init_(Keys :: [char()], Values :: [unicode:unicode_binary()], Dictionary :: [unicode:unicode_binary()]) -> any().\nencrypter_init_(Keys, Values, Dictionary) ->\n .\n\n-spec encrypter_encrypt(Word1 :: unicode:unicode_binary()) -> unicode:unicode_binary().\nencrypter_encrypt(Word1) ->\n .\n\n-spec encrypter_decrypt(Word2 :: unicode:unicode_binary()) -> integer().\nencrypter_decrypt(Word2) ->\n .\n\n\n%% Your functions will be called as such:\n%% encrypter_init_(Keys, Values, Dictionary),\n%% Param_1 = encrypter_encrypt(Word1),\n%% Param_2 = encrypter_decrypt(Word2),\n\n%% encrypter_init_ will be called before every test case, in which you can do some necessary initializations.",
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{
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"lang": "Elixir",
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"langSlug": "elixir",
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"code": "defmodule Encrypter do\n @spec init_(keys :: [char], values :: [String.t], dictionary :: [String.t]) :: any\n def init_(keys, values, dictionary) do\n \n end\n\n @spec encrypt(word1 :: String.t) :: String.t\n def encrypt(word1) do\n \n end\n\n @spec decrypt(word2 :: String.t) :: integer\n def decrypt(word2) do\n \n end\nend\n\n# Your functions will be called as such:\n# Encrypter.init_(keys, values, dictionary)\n# param_1 = Encrypter.encrypt(word1)\n# param_2 = Encrypter.decrypt(word2)\n\n# Encrypter.init_ will be called before every test case, in which you can do some necessary initializations.",
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"__typename": "CodeSnippetNode"
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"stats": "{\"totalAccepted\": \"11.4K\", \"totalSubmission\": \"28.6K\", \"totalAcceptedRaw\": 11378, \"totalSubmissionRaw\": 28632, \"acRate\": \"39.7%\"}",
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"hints": [
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"For encryption, use hashmap to map each char of word1 to its value.",
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"For decryption, use trie to prune when necessary."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "[\"Encrypter\",\"encrypt\",\"decrypt\"]\n[[[\"a\",\"b\",\"c\",\"d\"],[\"ei\",\"zf\",\"ei\",\"am\"],[\"abcd\",\"acbd\",\"adbc\",\"badc\",\"dacb\",\"cadb\",\"cbda\",\"abad\"]],[\"abcd\"],[\"eizfeiam\"]]",
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"metaData": "{\n \"classname\": \"Encrypter\",\n \"constructor\": {\n \"params\": [\n {\n \"name\": \"keys\",\n \"type\": \"character[]\"\n },\n {\n \"type\": \"string[]\",\n \"name\": \"values\"\n },\n {\n \"name\": \"dictionary\",\n \"type\": \"string[]\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"word1\"\n }\n ],\n \"name\": \"encrypt\",\n \"return\": {\n \"type\": \"string\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"word2\"\n }\n ],\n \"name\": \"decrypt\",\n \"return\": {\n \"type\": \"integer\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true,\n \"manual\": false\n}",
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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 gnu11 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. 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