{ "data": { "question": { "questionId": "1433", "questionFrontendId": "2227", "categoryTitle": "Algorithms", "boundTopicId": 1385208, "title": "Encrypt and Decrypt Strings", "titleSlug": "encrypt-and-decrypt-strings", "content": "

You are given a character array keys containing unique characters and a string array values containing strings of length 2. You are also given another string array dictionary that contains all permitted original strings after decryption. You should implement a data structure that can encrypt or decrypt a 0-indexed string.

\n\n

A string is encrypted with the following process:

\n\n
    \n\t
  1. For each character c in the string, we find the index i satisfying keys[i] == c in keys.
    2. \n\t
  2. Replace c with values[i] in the string.
    3. \n
\n\n

Note that in case a character of the string is not present in keys, the encryption process cannot be carried out, and an empty string "" is returned.

\n\n

A string is decrypted with the following process:

\n\n
    \n\t
  1. For each substring s of length 2 occurring at an even index in the string, we find an i such that values[i] == s. If there are multiple valid i, we choose any one of them. This means a string could have multiple possible strings it can decrypt to.
    2. \n\t
  2. Replace s with keys[i] in the string.
    3. \n
\n\n

Implement the Encrypter class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["Encrypter", "encrypt", "decrypt"]\n[[['a', 'b', 'c', 'd'], ["ei", "zf", "ei", "am"], ["abcd", "acbd", "adbc", "badc", "dacb", "cadb", "cbda", "abad"]], ["abcd"], ["eizfeiam"]]\nOutput\n[null, "eizfeiam", 2]\n\nExplanation\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
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "加密解密字符串", "translatedContent": "

给你一个字符数组 keys ，由若干 互不相同 的字符组成。还有一个字符串数组 values ，内含若干长度为 2 的字符串。另给你一个字符串数组 dictionary ，包含解密后所有允许的原字符串。请你设计并实现一个支持加密及解密下标从 0 开始字符串的数据结构。

\n\n

字符串 加密 按下述步骤进行：

\n\n
    \n\t
  1. 对字符串中的每个字符 c ，先从 keys 中找出满足 keys[i] == c 的下标 i 。
    2. \n\t
  2. 在字符串中，用 values[i] 替换字符 c 。
    3. \n
\n\n

字符串 解密 按下述步骤进行：

\n\n
    \n\t
  1. 将字符串每相邻 2 个字符划分为一个子字符串，对于每个子字符串 s ，找出满足 values[i] == s 的一个下标 i 。如果存在多个有效的 i ，从中选择 任意 一个。这意味着一个字符串解密可能得到多个解密字符串。
    2. \n\t
  2. 在字符串中，用 keys[i] 替换 s 。
    3. \n
\n\n

实现 Encrypter 类：

\n\n\n\n

 

\n\n

示例：

\n\n
\n输入：\n[\"Encrypter\", \"encrypt\", \"decrypt\"]\n[[['a', 'b', 'c', 'd'], [\"ei\", \"zf\", \"ei\", \"am\"], [\"abcd\", \"acbd\", \"adbc\", \"badc\", \"dacb\", \"cadb\", \"cbda\", \"abad\"]], [\"abcd\"], [\"eizfeiam\"]]\n输出：\n[null, \"eizfeiam\", 2]\n\n解释：\nEncrypter encrypter = new Encrypter([['a', 'b', 'c', 'd'], [\"ei\", \"zf\", \"ei\", \"am\"], [\"abcd\", \"acbd\", \"adbc\", \"badc\", \"dacb\", \"cadb\", \"cbda\", \"abad\"]);\nencrypter.encrypt(\"abcd\"); // 返回 \"eizfeiam\"。 \n                           // 'a' 映射为 \"ei\"，'b' 映射为 \"zf\"，'c' 映射为 \"ei\"，'d' 映射为 \"am\"。\nencrypter.decrypt(\"eizfeiam\"); // return 2. \n                              // \"ei\" 可以映射为 'a' 或 'c'，\"zf\" 映射为 'b'，\"am\" 映射为 'd'。 \n                              // 因此，解密后可以得到的字符串是 \"abad\"，\"cbad\"，\"abcd\" 和 \"cbcd\"。 \n                              // 其中 2 个字符串，\"abad\" 和 \"abcd\"，在 dictionary 中出现，所以答案是 2 。\n
\n\n

 

\n\n

提示：

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"TopicTagNode" }, { "name": "String", "slug": "string", "translatedName": "字符串", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class Encrypter {\npublic:\n Encrypter(vector& keys, vector& values, vector& 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 */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "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)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "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)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "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*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "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)", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class Encrypter(keys: CharArray, values: Array, dictionary: Array) {\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 */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "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, values: Vec, dictionary: Vec) -> 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 */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "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 )\n ; decrypt : string? -> exact-integer?\n (define/public (decrypt word2)\n\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))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "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.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "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.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"4.4K\", \"totalSubmission\": \"11.4K\", \"totalAcceptedRaw\": 4411, \"totalSubmissionRaw\": 11450, \"acRate\": \"38.5%\"}", "hints": [ "For encryption, use hashmap to map each char of word1 to its value.", "For decryption, use trie to prune when necessary." ], "solution": null, "status": null, "sampleTestCase": "[\"Encrypter\",\"encrypt\",\"decrypt\"]\n[[[\"a\",\"b\",\"c\",\"d\"],[\"ei\",\"zf\",\"ei\",\"am\"],[\"abcd\",\"acbd\",\"adbc\",\"badc\",\"dacb\",\"cadb\",\"cbda\",\"abad\"]],[\"abcd\"],[\"eizfeiam\"]]", "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}", "judgerAvailable": true, "judgeType": "large", 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With bcmath module.<\\/p>\"],\"typescript\":[\"TypeScript\",\"
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