leetcode-problemset/leetcode/originData/memoize.json

{
    "data": {
        "question": {
            "questionId": "2731",
            "questionFrontendId": "2623",
            "boundTopicId": null,
            "title": "Memoize",
            "titleSlug": "memoize",
            "content": "<p>Given a function <code>fn</code>, return a&nbsp;<strong>memoized</strong>&nbsp;version of that function.</p>\n\n<p>A&nbsp;<strong>memoized&nbsp;</strong>function is a function that will never be called twice with&nbsp;the same inputs. Instead it will returned a cached value.</p>\n\n<p>You can assume there are&nbsp;<strong>3&nbsp;</strong>possible input functions:&nbsp;<code>sum</code><strong>, </strong><code>fib</code><strong>,&nbsp;</strong>and&nbsp;<code>factorial</code><strong>.</strong></p>\n\n<ul>\n\t<li><code>sum</code><strong>&nbsp;</strong>accepts two integers&nbsp;<code>a</code> and <code>b</code> and returns <code>a + b</code>.</li>\n\t<li><code>fib</code><strong>&nbsp;</strong>accepts a&nbsp;single integer&nbsp;<code>n</code> and&nbsp;returns&nbsp;<code>1</code> if <font face=\"monospace\"><code>n &lt;= 1</code> </font>or<font face=\"monospace\">&nbsp;<code>fib(n - 1) + fib(n - 2)</code>&nbsp;</font>otherwise.</li>\n\t<li><code>factorial</code>&nbsp;accepts a single integer&nbsp;<code>n</code> and returns <code>1</code>&nbsp;if&nbsp;<code>n &lt;= 1</code>&nbsp;or&nbsp;<code>factorial(n - 1) * n</code>&nbsp;otherwise.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n&quot;sum&quot;\n[&quot;call&quot;,&quot;call&quot;,&quot;getCallCount&quot;,&quot;call&quot;,&quot;getCallCount&quot;]\n[[2,2],[2,2],[],[1,2],[]]\n<strong>Output</strong>\n[4,4,1,3,2]\n\n<strong>Explanation</strong>\nconst sum = (a, b) =&gt; a + b;\nconst memoizedSum = memoize(sum);\nmemoizedSum(2, 2); // Returns 4. sum() was called as (2, 2) was not seen before.\nmemoizedSum(2, 2); // Returns 4. However sum() was not called because the same inputs were seen before.\n// Total call count: 1\nmemoizedSum(1, 2); // Returns 3. sum() was called as (1, 2) was not seen before.\n// Total call count: 2\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input\n</strong>&quot;factorial&quot;\n[&quot;call&quot;,&quot;call&quot;,&quot;call&quot;,&quot;getCallCount&quot;,&quot;call&quot;,&quot;getCallCount&quot;]\n[[2],[3],[2],[],[3],[]]\n<strong>Output</strong>\n[2,6,2,2,6,2]\n\n<strong>Explanation</strong>\nconst factorial = (n) =&gt; (n &lt;= 1) ? 1 : (n * factorial(n - 1));\nconst memoFactorial = memoize(factorial);\nmemoFactorial(2); // Returns 2.\nmemoFactorial(3); // Returns 6.\nmemoFactorial(2); // Returns 2. However factorial was not called because 2 was seen before.\n// Total call count: 2\nmemoFactorial(3); // Returns 6. However factorial was not called because 3 was seen before.\n// Total call count: 2\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input\n</strong>&quot;fib&quot;\n[&quot;call&quot;,&quot;getCallCount&quot;]\n[[5],[]]\n<strong>Output</strong>\n[8,1]\n\n<strong>Explanation\n</strong>fib(5) = 8\n// Total call count: 1\n\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= a, b &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= n &lt;= 10</code></li>\n\t<li><code>at most 10<sup>5</sup>&nbsp;function calls</code></li>\n\t<li><code>at most 10<sup>5</sup>&nbsp;attempts to access callCount</code></li>\n\t<li><code>input function is sum, fib, or factorial</code></li>\n</ul>\n",
            "translatedTitle": null,
            "translatedContent": null,
            "isPaidOnly": false,
            "difficulty": "Medium",
            "likes": 18,
            "dislikes": 2,
            "isLiked": null,
            "similarQuestions": "[{\"title\": \"Counter\", \"titleSlug\": \"counter\", \"difficulty\": \"Easy\", \"translatedTitle\": null}, {\"title\": \"Curry\", \"titleSlug\": \"curry\", \"difficulty\": \"Medium\", \"translatedTitle\": null}, {\"title\": \"Function Composition\", \"titleSlug\": \"function-composition\", \"difficulty\": \"Easy\", \"translatedTitle\": null}, {\"title\": \"Memoize II\", \"titleSlug\": \"memoize-ii\", \"difficulty\": \"Hard\", \"translatedTitle\": null}]",
            "exampleTestcases": "\"sum\"\n[\"call\",\"call\",\"getCallCount\",\"call\",\"getCallCount\"]\n[[2,2],[2,2],[],[1,2],[]]\n\"factorial\"\n[\"call\",\"call\",\"call\",\"getCallCount\",\"call\",\"getCallCount\"]\n[[2],[3],[2],[],[3],[]]\n\"fib\"\n[\"call\",\"getCallCount\"]\n[[5],[]]",
            "categoryTitle": "JavaScript",
            "contributors": [],
            "topicTags": [],
            "companyTagStats": null,
            "codeSnippets": [
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * @param {Function} fn\n */\nfunction memoize(fn) {\n    return function(...args) {\n        \n    }\n}\n\n\n/** \n * let callCount = 0;\n * const memoizedFn = memoize(function (a, b) {\n *\t callCount += 1;\n *   return a + b;\n * })\n * memoizedFn(2, 3) // 5\n * memoizedFn(2, 3) // 5\n * console.log(callCount) // 1 \n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "type Fn = (...params: any) => any\n\nfunction memoize(fn: Fn): Fn {\n    return function(...args) {\n        \n    }\n}\n\n\n/** \n * let callCount = 0;\n * const memoizedFn = memoize(function (a, b) {\n *\t callCount += 1;\n *   return a + b;\n * })\n * memoizedFn(2, 3) // 5\n * memoizedFn(2, 3) // 5\n * console.log(callCount) // 1 \n */",
                    "__typename": "CodeSnippetNode"
                }
            ],
            "stats": "{\"totalAccepted\": \"576\", \"totalSubmission\": \"919\", \"totalAcceptedRaw\": 576, \"totalSubmissionRaw\": 919, \"acRate\": \"62.7%\"}",
            "hints": [
                "You can create copy of a function by spreading function parameters. \r\n\r\nfunction outerFunction(passedFunction) {\r\n  return newFunction(...params) {\r\n    return passedFunction(...params);\r\n  };\r\n}",
                "params is an array. Since you know all values in the array are numbers, you can turn it into a string with JSON.stringify().",
                "In the outerFunction, you can declare a Map or Object. In the inner function you can avoid executing the passed function if the params have already been passed before."
            ],
            "solution": null,
            "status": null,
            "sampleTestCase": "\"sum\"\n[\"call\",\"call\",\"getCallCount\",\"call\",\"getCallCount\"]\n[[2,2],[2,2],[],[1,2],[]]",
            "metaData": "{\n  \"name\": \"foobar\",\n  \"params\": [\n    {\n      \"name\": \"fn_name\",\n      \"type\": \"string\"\n    },\n    {\n      \"type\": \"string[]\",\n      \"name\": \"methods\"\n    },\n    {\n      \"type\": \"integer[][]\",\n      \"name\": \"args\"\n    }\n  ],\n  \"return\": {\n    \"type\": \"integer\"\n  },\n  \"languages\": [\n    \"javascript\",\n    \"typescript\"\n  ],\n  \"manual\": true\n}",
            "judgerAvailable": true,
            "judgeType": "large",
            "mysqlSchemas": [],
            "enableRunCode": true,
            "enableTestMode": false,
            "enableDebugger": false,
            "envInfo": "{\"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 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://github.com/datastructures-js/queue/tree/e63563025a5a805aa16928cb53bcd517bfea9230\\\" target=\\\"_blank\\\">datastructures-js/queue</a>.</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>\"]}",
            "libraryUrl": null,
            "adminUrl": null,
            "challengeQuestion": null,
            "__typename": "QuestionNode"
        }
    }
}