leetcode-problemset/leetcode-cn/originData/[no content]find-the-k-th-lucky-number.json

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        "question": {
            "questionId": "3030",
            "questionFrontendId": "2802",
            "categoryTitle": "Algorithms",
            "boundTopicId": 2370606,
            "title": "Find The K-th Lucky Number",
            "titleSlug": "find-the-k-th-lucky-number",
            "content": null,
            "translatedTitle": "找出第 K 个幸运数字",
            "translatedContent": null,
            "isPaidOnly": true,
            "difficulty": "Medium",
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            "stats": "{\"totalAccepted\": \"127\", \"totalSubmission\": \"173\", \"totalAcceptedRaw\": 127, \"totalSubmissionRaw\": 173, \"acRate\": \"73.4%\"}",
            "hints": [
                "<div class=\"_1l1MA\">The number of lucky numbers with <strong>exactly</strong> <code>n</code> digits is equal to <code>2<sup>n</sup></code>.</div>",
                "<div class=\"_1l1MA\">We can obtain how many digits the <code>k<sup>th</sup></code> lucky number has.</div>",
                "<div class=\"_1l1MA\">Imagine we know that <code>k<sup>th</sup></code> lucky number has <code>c</code> digits. Then calculate how many numbers with <code>c</code> digits exist before the <code>k<sup>th</sup></code> lucky number.</div>",
                "<div class=\"_1l1MA\">Imagine the number from the previous hint is <code>x</code>. Now look at the binary representation of <code>x</code> and add some leading zero to make its length equal to <code>c</code>.</div>",
                "<div class=\"_1l1MA\">Replace <code>0</code> and <code>1</code> with <code>4</code> and <code>7</code> in the number you've obtained from the previous hint.</div>"
            ],
            "solution": null,
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            "sampleTestCase": "4",
            "metaData": "{\n  \"name\": \"kthLuckyNumber\",\n  \"params\": [\n    {\n      \"name\": \"k\",\n      \"type\": \"integer\"\n    }\n  ],\n  \"return\": {\n    \"type\": \"string\"\n  }\n}",
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