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        "question": {
            "questionId": "100350",
            "questionFrontendId": "面试题 16.09",
            "categoryTitle": "LCCI",
            "boundTopicId": 91313,
            "title": "Operations LCCI",
            "titleSlug": "operations-lcci",
            "content": "<p>Write methods to implement the multiply, subtract, and divide operations for integers. The results of all of these are integers. Use only the add operator.</p>\r\n\r\n<p>You should implement following methods:</p>\r\n\r\n<ul>\r\n\t<li><code>Operations()</code>&nbsp; constructor</li>\r\n\t<li><code>minus(a, b)</code>&nbsp; Subtraction, returns&nbsp;<code>a - b</code></li>\r\n\t<li><code>multiply(a, b)</code>&nbsp; Multiplication, returns&nbsp;<code>a * b</code></li>\r\n\t<li><code>divide(a, b)</code>&nbsp; Division, returns&nbsp;<code>a / b</code></li>\r\n</ul>\r\n\r\n<p><strong>Example: </strong></p>\r\n\r\n<pre>\r\nOperations operations = new Operations();\r\noperations.minus(1, 2); //returns -1\r\noperations.multiply(3, 4); //returns 12\r\noperations.divide(5, -2); //returns -2\r\n</pre>\r\n\r\n<p><strong>Note: </strong></p>\r\n\r\n<ul>\r\n\t<li>You can assume inputs are always valid, that is, e.g., denominator will not be 0 in division.</li>\r\n\t<li>The number of calls will not exceed 1000.</li>\r\n</ul>\r\n",
            "translatedTitle": "运算",
            "translatedContent": "<p>请实现整数数字的乘法、减法和除法运算，运算结果均为整数数字，程序中只允许使用加法运算符和逻辑运算符，允许程序中出现正负常数，不允许使用位运算。</p>\n<p>你的实现应该支持如下操作：</p>\n<ul>\n<li><code>Operations()</code> 构造函数</li>\n<li><code>minus(a, b)</code> 减法，返回<code>a - b</code></li>\n<li><code>multiply(a, b)</code> 乘法，返回<code>a * b</code></li>\n<li><code>divide(a, b)</code> 除法，返回<code>a / b</code></li>\n</ul>\n<p><strong>示例：</strong></p>\n<pre>Operations operations = new Operations();\noperations.minus(1, 2); //返回-1\noperations.multiply(3, 4); //返回12\noperations.divide(5, -2); //返回-2\n</pre>\n<p><strong>提示：</strong></p>\n<ul>\n<li>你可以假设函数输入一定是有效的，例如不会出现除法分母为0的情况</li>\n<li>单个用例的函数调用次数不会超过1000次</li>\n</ul>\n",
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                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class Operations {\npublic:\n    Operations() {\n\n    }\n    \n    int minus(int a, int b) {\n\n    }\n    \n    int multiply(int a, int b) {\n\n    }\n    \n    int divide(int a, int b) {\n\n    }\n};\n\n/**\n * Your Operations object will be instantiated and called as such:\n * Operations* obj = new Operations();\n * int param_1 = obj->minus(a,b);\n * int param_2 = obj->multiply(a,b);\n * int param_3 = obj->divide(a,b);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class Operations {\n\n    public Operations() {\n\n    }\n    \n    public int minus(int a, int b) {\n\n    }\n    \n    public int multiply(int a, int b) {\n\n    }\n    \n    public int divide(int a, int b) {\n\n    }\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * Operations obj = new Operations();\n * int param_1 = obj.minus(a,b);\n * int param_2 = obj.multiply(a,b);\n * int param_3 = obj.divide(a,b);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class Operations(object):\n\n    def __init__(self):\n\n\n    def minus(self, a, b):\n        \"\"\"\n        :type a: int\n        :type b: int\n        :rtype: int\n        \"\"\"\n\n\n    def multiply(self, a, b):\n        \"\"\"\n        :type a: int\n        :type b: int\n        :rtype: int\n        \"\"\"\n\n\n    def divide(self, a, b):\n        \"\"\"\n        :type a: int\n        :type b: int\n        :rtype: int\n        \"\"\"\n\n\n\n# Your Operations object will be instantiated and called as such:\n# obj = Operations()\n# param_1 = obj.minus(a,b)\n# param_2 = obj.multiply(a,b)\n# param_3 = obj.divide(a,b)",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class Operations:\n\n    def __init__(self):\n\n\n    def minus(self, a: int, b: int) -> int:\n\n\n    def multiply(self, a: int, b: int) -> int:\n\n\n    def divide(self, a: int, b: int) -> int:\n\n\n\n# Your Operations object will be instantiated and called as such:\n# obj = Operations()\n# param_1 = obj.minus(a,b)\n# param_2 = obj.multiply(a,b)\n# param_3 = obj.divide(a,b)",
                    "__typename": "CodeSnippetNode"
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                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n\n} Operations;\n\n\nOperations* operationsCreate() {\n\n}\n\nint operationsMinus(Operations* obj, int a, int b) {\n\n}\n\nint operationsMultiply(Operations* obj, int a, int b) {\n\n}\n\nint operationsDivide(Operations* obj, int a, int b) {\n\n}\n\nvoid operationsFree(Operations* obj) {\n\n}\n\n/**\n * Your Operations struct will be instantiated and called as such:\n * Operations* obj = operationsCreate();\n * int param_1 = operationsMinus(obj, a, b);\n \n * int param_2 = operationsMultiply(obj, a, b);\n \n * int param_3 = operationsDivide(obj, a, b);\n \n * operationsFree(obj);\n*/",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class Operations {\n\n    public Operations() {\n\n    }\n    \n    public int Minus(int a, int b) {\n\n    }\n    \n    public int Multiply(int a, int b) {\n\n    }\n    \n    public int Divide(int a, int b) {\n\n    }\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * Operations obj = new Operations();\n * int param_1 = obj.Minus(a,b);\n * int param_2 = obj.Multiply(a,b);\n * int param_3 = obj.Divide(a,b);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "\nvar Operations = function() {\n\n};\n\n/** \n * @param {number} a \n * @param {number} b\n * @return {number}\n */\nOperations.prototype.minus = function(a, b) {\n\n};\n\n/** \n * @param {number} a \n * @param {number} b\n * @return {number}\n */\nOperations.prototype.multiply = function(a, b) {\n\n};\n\n/** \n * @param {number} a \n * @param {number} b\n * @return {number}\n */\nOperations.prototype.divide = function(a, b) {\n\n};\n\n/**\n * Your Operations object will be instantiated and called as such:\n * var obj = new Operations()\n * var param_1 = obj.minus(a,b)\n * var param_2 = obj.multiply(a,b)\n * var param_3 = obj.divide(a,b)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class Operations {\n    constructor() {\n\n    }\n\n    minus(a: number, b: number): number {\n\n    }\n\n    multiply(a: number, b: number): number {\n\n    }\n\n    divide(a: number, b: number): number {\n\n    }\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * var obj = new Operations()\n * var param_1 = obj.minus(a,b)\n * var param_2 = obj.multiply(a,b)\n * var param_3 = obj.divide(a,b)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class Operations {\n    /**\n     */\n    function __construct() {\n\n    }\n\n    /**\n     * @param Integer $a\n     * @param Integer $b\n     * @return Integer\n     */\n    function minus($a, $b) {\n\n    }\n\n    /**\n     * @param Integer $a\n     * @param Integer $b\n     * @return Integer\n     */\n    function multiply($a, $b) {\n\n    }\n\n    /**\n     * @param Integer $a\n     * @param Integer $b\n     * @return Integer\n     */\n    function divide($a, $b) {\n\n    }\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * $obj = Operations();\n * $ret_1 = $obj->minus($a, $b);\n * $ret_2 = $obj->multiply($a, $b);\n * $ret_3 = $obj->divide($a, $b);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass Operations {\n\n    init() {\n\n    }\n    \n    func minus(_ a: Int, _ b: Int) -> Int {\n\n    }\n    \n    func multiply(_ a: Int, _ b: Int) -> Int {\n\n    }\n    \n    func divide(_ a: Int, _ b: Int) -> Int {\n\n    }\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * let obj = Operations()\n * let ret_1: Int = obj.minus(a, b)\n * let ret_2: Int = obj.multiply(a, b)\n * let ret_3: Int = obj.divide(a, b)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class Operations() {\n\n    fun minus(a: Int, b: Int): Int {\n\n    }\n\n    fun multiply(a: Int, b: Int): Int {\n\n    }\n\n    fun divide(a: Int, b: Int): Int {\n\n    }\n\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * var obj = Operations()\n * var param_1 = obj.minus(a,b)\n * var param_2 = obj.multiply(a,b)\n * var param_3 = obj.divide(a,b)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Dart",
                    "langSlug": "dart",
                    "code": "class Operations {\n\n  Operations() {\n\n  }\n  \n  int minus(int a, int b) {\n\n  }\n  \n  int multiply(int a, int b) {\n\n  }\n  \n  int divide(int a, int b) {\n\n  }\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * Operations obj = Operations();\n * int param1 = obj.minus(a,b);\n * int param2 = obj.multiply(a,b);\n * int param3 = obj.divide(a,b);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type Operations struct {\n\n}\n\n\nfunc Constructor() Operations {\n\n}\n\n\nfunc (this *Operations) Minus(a int, b int) int {\n\n}\n\n\nfunc (this *Operations) Multiply(a int, b int) int {\n\n}\n\n\nfunc (this *Operations) Divide(a int, b int) int {\n\n}\n\n\n/**\n * Your Operations object will be instantiated and called as such:\n * obj := Constructor();\n * param_1 := obj.Minus(a,b);\n * param_2 := obj.Multiply(a,b);\n * param_3 := obj.Divide(a,b);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class Operations\n    def initialize()\n\n    end\n\n\n=begin\n    :type a: Integer\n    :type b: Integer\n    :rtype: Integer\n=end\n    def minus(a, b)\n\n    end\n\n\n=begin\n    :type a: Integer\n    :type b: Integer\n    :rtype: Integer\n=end\n    def multiply(a, b)\n\n    end\n\n\n=begin\n    :type a: Integer\n    :type b: Integer\n    :rtype: Integer\n=end\n    def divide(a, b)\n\n    end\n\n\nend\n\n# Your Operations object will be instantiated and called as such:\n# obj = Operations.new()\n# param_1 = obj.minus(a, b)\n# param_2 = obj.multiply(a, b)\n# param_3 = obj.divide(a, b)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class Operations() {\n\n    def minus(a: Int, b: Int): Int = {\n\n    }\n\n    def multiply(a: Int, b: Int): Int = {\n\n    }\n\n    def divide(a: Int, b: Int): Int = {\n\n    }\n\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * var obj = new Operations()\n * var param_1 = obj.minus(a,b)\n * var param_2 = obj.multiply(a,b)\n * var param_3 = obj.divide(a,b)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct Operations {\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 Operations {\n\n    fn new() -> Self {\n\n    }\n    \n    fn minus(&self, a: i32, b: i32) -> i32 {\n\n    }\n    \n    fn multiply(&self, a: i32, b: i32) -> i32 {\n\n    }\n    \n    fn divide(&self, a: i32, b: i32) -> i32 {\n\n    }\n}\n\n/**\n * Your Operations object will be instantiated and called as such:\n * let obj = Operations::new();\n * let ret_1: i32 = obj.minus(a, b);\n * let ret_2: i32 = obj.multiply(a, b);\n * let ret_3: i32 = obj.divide(a, b);\n */",
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                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define operations%\n  (class object%\n    (super-new)\n    (init-field)\n    \n    ; minus : exact-integer? exact-integer? -> exact-integer?\n    (define/public (minus a b)\n\n      )\n    ; multiply : exact-integer? exact-integer? -> exact-integer?\n    (define/public (multiply a b)\n\n      )\n    ; divide : exact-integer? exact-integer? -> exact-integer?\n    (define/public (divide a b)\n\n      )))\n\n;; Your operations% object will be instantiated and called as such:\n;; (define obj (new operations%))\n;; (define param_1 (send obj minus a b))\n;; (define param_2 (send obj multiply a b))\n;; (define param_3 (send obj divide a b))",
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                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec operations_init_() -> any().\noperations_init_() ->\n  .\n\n-spec operations_minus(A :: integer(), B :: integer()) -> integer().\noperations_minus(A, B) ->\n  .\n\n-spec operations_multiply(A :: integer(), B :: integer()) -> integer().\noperations_multiply(A, B) ->\n  .\n\n-spec operations_divide(A :: integer(), B :: integer()) -> integer().\noperations_divide(A, B) ->\n  .\n\n\n%% Your functions will be called as such:\n%% operations_init_(),\n%% Param_1 = operations_minus(A, B),\n%% Param_2 = operations_multiply(A, B),\n%% Param_3 = operations_divide(A, B),\n\n%% operations_init_ will be called before every test case, in which you can do some necessary initializations.",
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                    "lang": "Elixir",
                    "langSlug": "elixir",
                    "code": "defmodule Operations do\n  @spec init_() :: any\n  def init_() do\n\n  end\n\n  @spec minus(a :: integer, b :: integer) :: integer\n  def minus(a, b) do\n\n  end\n\n  @spec multiply(a :: integer, b :: integer) :: integer\n  def multiply(a, b) do\n\n  end\n\n  @spec divide(a :: integer, b :: integer) :: integer\n  def divide(a, b) do\n\n  end\nend\n\n# Your functions will be called as such:\n# Operations.init_()\n# param_1 = Operations.minus(a, b)\n# param_2 = Operations.multiply(a, b)\n# param_3 = Operations.divide(a, b)\n\n# Operations.init_ will be called before every test case, in which you can do some necessary initializations.",
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            "hints": [
                "从减法开始，逐步解决。一旦完成了一个函数，你可以用它来实现其他函数。",
                "减法：取负函数（将正整数转换为负数）有用吗？你可以使用加法操作符来实现吗?",
                "当a > b时，a – b > 0。你能得到a – b的符号位吗？",
                "你考虑过如何处理a – b中的整数溢出吗？"
            ],
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