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https://gitee.com/coder-xiaomo/leetcode-problemset
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56 lines
8.8 KiB
JSON
56 lines
8.8 KiB
JSON
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"questionId": "2862",
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"questionFrontendId": "2725",
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"boundTopicId": null,
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"title": "Interval Cancellation",
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"titleSlug": "interval-cancellation",
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"content": "Given a function <code>fn,</code> an array of arguments <code>args</code>, and an interval time <code>t</code>, return a cancel function <code>cancelFn</code>. The function <code>fn</code> should be called with <code>args</code> immediately and then called again every <code>t</code> milliseconds until <code>cancelFn</code> is called.\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> fn = (x) => x * 2, args = [4], t = 20, cancelT = 110\n<strong>Output:</strong> \n[\n {"time": 0, "returned": 8},\n {"time": 20, "returned": 8},\n {"time": 40, "returned": 8},\n {"time": 60, "returned": 8},\n {"time": 80, "returned": 8},\n {"time": 100, "returned": 8}\n]\n<strong>Explanation:</strong> Every 20ms, fn(4) is called. Until t=110ms, then it is cancelled.\n\nconst cancel = cancellable(x => x * 2, [4], 20);\nsetTimeout(cancel, 110);\n\n1st fn call is at 0ms. fn(4) returns 8.\n2nd fn call is at 20ms. fn(4) returns 8.\n3rd fn call is at 40ms. fn(4) returns 8.\n4th fn call is at 60ms. fn(4) returns 8.\n5th fn call is at 80ms. fn(4) returns 8.\n6th fn call is at 100ms. fn(4) returns 8.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> fn = (x1, x2) => (x1 * x2), args = [2, 5], t = 25, cancelT = 140\n<strong>Output:</strong> \n[\n {"time": 0, "returned": 10},\n {"time": 25, "returned": 10},\n {"time": 50, "returned": 10},\n {"time": 75, "returned": 10},\n {"time": 100, "returned": 10},\n {"time": 125, "returned": 10}\n]\n<strong>Explanation:</strong> Every 25ms, fn(2, 5) is called. Until t=140ms, then it is cancelled.\n1st fn call is at 0ms \n2nd fn call is at 25ms \n3rd fn call is at 50ms \n4th fn call is at 75ms \n5th fn call is at 100ms \n6th fn call is at 125ms\nCancelled at 140ms\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> fn = (x1, x2, x3) => (x1 + x2 + x3), args = [5, 1, 3], t = 50, cancelT = 180\n<strong>Output:</strong> \n[\n {"time": 0, "returned": 9},\n {"time": 50, "returned": 9},\n {"time": 100, "returned": 9},\n {"time": 150, "returned": 9}\n]\n<strong>Explanation:</strong> Every 50ms, fn(5, 1, 3) is called. Until t=180ms, then it is cancelled. \n1st fn call is at 0ms\n2nd fn call is at 50ms\n3rd fn call is at 100ms\n4th fn call is at 150ms\nCancelled at 180ms\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>fn is a function</code></li>\n\t<li><code>args is a valid JSON array</code></li>\n\t<li><code>1 <= args.length <= 10</code></li>\n\t<li><code><font face=\"monospace\">20 <= t <= 1000</font></code></li>\n\t<li><code><font face=\"monospace\">10 <= cancelT <= 1000</font></code></li>\n</ul>\n",
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"difficulty": "Easy",
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"likes": 21,
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"exampleTestcases": "(x) => x * 2\n[4]\n20\n110\n(x1, x2) => (x1 * x2)\n[2,5]\n25\n140\n(x1, x2, x3) => (x1 + x2 + x3)\n[5,1,3]\n50\n160",
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"categoryTitle": "JavaScript",
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{
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "/**\n * @param {Function} fn\n * @param {Array} args\n * @param {number} t\n * @return {Function}\n */\nvar cancellable = function(fn, args, t) {\n \n};\n\n/**\n * const result = []\n *\n * const fn = (x) => x * 2\n * const args = [4], t = 20, cancelT = 110\n *\n * const start = performance.now()\n *\n * const log = (...argsArr) => {\n *\t\tconst val = fn(...argsArr)\n * result.push({\"time\": Math.floor(performance.now() - start), \"returned\": fn(...argsArr)})\n * }\n * \n * const cancel = cancellable(log, args, t);\n * \n * setTimeout(() => {\n * cancel()\n * console.log(result) // [\n * // {\"time\":0,\"returned\":8},\n * // {\"time\":20,\"returned\":8},\n * // {\"time\":40,\"returned\":8}, \n * // {\"time\":60,\"returned\":8},\n * // {\"time\":80,\"returned\":8},\n * // {\"time\":100,\"returned\":8}\n * // ]\n * }, cancelT)\n */",
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{
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "function cancellable(fn: Function, args: any[], t: number): Function {\n\n};\n\n/**\n * const result = []\n *\n * const fn = (x) => x * 2\n * const args = [4], t = 20, cancelT = 110\n *\n * const start = performance.now()\n *\n * const log = (...argsArr) => {\n *\t\tconst val = fn(...argsArr)\n * result.push({\"time\": Math.floor(performance.now() - start), \"returned\": fn(...argsArr)})\n * }\n * \n * const cancel = cancellable(log, args, t);\n * \n * setTimeout(() => {\n * cancel()\n * console.log(result) // [\n * // {\"time\":0,\"returned\":8},\n * // {\"time\":20,\"returned\":8},\n * // {\"time\":40,\"returned\":8}, \n * // {\"time\":60,\"returned\":8},\n * // {\"time\":80,\"returned\":8},\n * // {\"time\":100,\"returned\":8}\n * // ]\n * }, cancelT)\n */",
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"stats": "{\"totalAccepted\": \"726\", \"totalSubmission\": \"783\", \"totalAcceptedRaw\": 726, \"totalSubmissionRaw\": 783, \"acRate\": \"92.7%\"}",
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"hints": [],
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"solution": null,
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"status": null,
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"sampleTestCase": "(x) => x * 2\n[4]\n20\n110",
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"metaData": "{\n \"name\": \"cancellable\",\n \"params\": [\n {\n \"name\": \"fn\",\n \"type\": \"string\"\n },\n {\n \"type\": \"string\",\n \"name\": \"args\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"t\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"cancelT\"\n }\n ],\n \"return\": {\n \"type\": \"integer\"\n },\n \"languages\": [\n \"javascript\",\n \"typescript\"\n ],\n \"manual\": true\n}",
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"judgeType": "large",
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