mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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182 lines
16 KiB
JSON
182 lines
16 KiB
JSON
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"questionId": "264",
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"title": "Ugly Number II",
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"content": "<p>An <strong>ugly number</strong> is a positive integer whose prime factors are limited to <code>2</code>, <code>3</code>, and <code>5</code>.</p>\n\n<p>Given an integer <code>n</code>, return <em>the</em> <code>n<sup>th</sup></code> <em><strong>ugly number</strong></em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 10\n<strong>Output:</strong> 12\n<strong>Explanation:</strong> [1, 2, 3, 4, 5, 6, 8, 9, 10, 12] is the sequence of the first 10 ugly numbers.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> 1 has no prime factors, therefore all of its prime factors are limited to 2, 3, and 5.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 1690</code></li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "10\n1",
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"categoryTitle": "Algorithms",
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"code": "# @param {Integer} n\n# @return {Integer}\ndef nth_ugly_number(n)\n \nend",
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"code": "impl Solution {\n pub fn nth_ugly_number(n: i32) -> i32 {\n \n }\n}",
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"code": "class Solution {\n\n /**\n * @param Integer $n\n * @return Integer\n */\n function nthUglyNumber($n) {\n \n }\n}",
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"code": "(define/contract (nth-ugly-number n)\n (-> exact-integer? exact-integer?)\n\n )",
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"lang": "Erlang",
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"code": "-spec nth_ugly_number(N :: integer()) -> integer().\nnth_ugly_number(N) ->\n .",
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"code": "defmodule Solution do\n @spec nth_ugly_number(n :: integer) :: integer\n def nth_ugly_number(n) do\n\n end\nend",
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"hints": [
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"The naive approach is to call <code>isUgly</code> for every number until you reach the n<sup>th</sup> one. Most numbers are <i>not</i> ugly. Try to focus your effort on generating only the ugly ones.",
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"An ugly number must be multiplied by either 2, 3, or 5 from a smaller ugly number.",
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"The key is how to maintain the order of the ugly numbers. Try a similar approach of merging from three sorted lists: L<sub>1</sub>, L<sub>2</sub>, and L<sub>3</sub>.",
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"Assume you have U<sub>k</sub>, the k<sup>th</sup> ugly number. Then U<sub>k+1</sub> must be Min(L<sub>1</sub> * 2, L<sub>2</sub> * 3, L<sub>3</sub> * 5)."
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],
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"sampleTestCase": "10",
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"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code> OpenJDK 17 </code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. 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