mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
18 KiB
JSON
186 lines
18 KiB
JSON
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"title": "Find the Count of Good Integers",
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"content": "<p>You are given two <strong>positive</strong> integers <code>n</code> and <code>k</code>.</p>\n\n<p>An integer <code>x</code> is called <strong>k-palindromic</strong> if:</p>\n\n<ul>\n\t<li><code>x</code> is a <span data-keyword=\"palindrome-integer\">palindrome</span>.</li>\n\t<li><code>x</code> is divisible by <code>k</code>.</li>\n</ul>\n\n<p>An integer is called <strong>good</strong> if its digits can be <em>rearranged</em> to form a <strong>k-palindromic</strong> integer. For example, for <code>k = 2</code>, 2020 can be rearranged to form the <em>k-palindromic</em> integer 2002, whereas 1010 cannot be rearranged to form a <em>k-palindromic</em> integer.</p>\n\n<p>Return the count of <strong>good</strong> integers containing <code>n</code> digits.</p>\n\n<p><strong>Note</strong> that <em>any</em> integer must <strong>not</strong> have leading zeros, <strong>neither</strong> before <strong>nor</strong> after rearrangement. For example, 1010 <em>cannot</em> be rearranged to form 101.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 3, k = 5</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">27</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><em>Some</em> of the good integers are:</p>\n\n<ul>\n\t<li>551 because it can be rearranged to form 515.</li>\n\t<li>525 because it is already k-palindromic.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 1, k = 4</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The two good integers are 4 and 8.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 5, k = 6</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2468</span></p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10</code></li>\n\t<li><code>1 <= k <= 9</code></li>\n</ul>\n",
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"code": "/**\n * @param {number} n\n * @param {number} k\n * @return {number}\n */\nvar countGoodIntegers = function(n, k) {\n \n};",
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"code": "class Solution {\n\n /**\n * @param Integer $n\n * @param Integer $k\n * @return Integer\n */\n function countGoodIntegers($n, $k) {\n \n }\n}",
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"code": "# @param {Integer} n\n# @param {Integer} k\n# @return {Integer}\ndef count_good_integers(n, k)\n \nend",
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"hints": [
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"How to generate all K-palindromic strings of length <code>n</code>? Do we need to go through all <code>n</code> digits?",
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"Use permutations to calculate the number of possible rearrangements."
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