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": "2475",
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"title": "Largest Palindromic Number",
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"content": "<p>You are given a string <code>num</code> consisting of digits only.</p>\n\n<p>Return <em>the <strong>largest palindromic</strong> integer (in the form of a string) that can be formed using digits taken from </em><code>num</code>. It should not contain <strong>leading zeroes</strong>.</p>\n\n<p><strong>Notes:</strong></p>\n\n<ul>\n\t<li>You do <strong>not</strong> need to use all the digits of <code>num</code>, but you must use <strong>at least</strong> one digit.</li>\n\t<li>The digits can be reordered.</li>\n</ul>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = "444947137"\n<strong>Output:</strong> "7449447"\n<strong>Explanation:</strong> \nUse the digits "4449477" from "<u><strong>44494</strong></u><u><strong>7</strong></u>13<u><strong>7</strong></u>" to form the palindromic integer "7449447".\nIt can be shown that "7449447" is the largest palindromic integer that can be formed.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = "00009"\n<strong>Output:</strong> "9"\n<strong>Explanation:</strong> \nIt can be shown that "9" is the largest palindromic integer that can be formed.\nNote that the integer returned should not contain leading zeroes.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= num.length <= 10<sup>5</sup></code></li>\n\t<li><code>num</code> consists of digits.</li>\n</ul>\n",
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"code": "class Solution(object):\n def largestPalindromic(self, num):\n \"\"\"\n :type num: str\n :rtype: str\n \"\"\"\n ",
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"lang": "Erlang",
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"code": "-spec largest_palindromic(Num :: unicode:unicode_binary()) -> unicode:unicode_binary().\nlargest_palindromic(Num) ->\n .",
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"code": "defmodule Solution do\n @spec largest_palindromic(num :: String.t) :: String.t\n def largest_palindromic(num) do\n\n end\nend",
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"stats": "{\"totalAccepted\": \"13K\", \"totalSubmission\": \"45K\", \"totalAcceptedRaw\": 12979, \"totalSubmissionRaw\": 45032, \"acRate\": \"28.8%\"}",
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"hints": [
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"In order to form a valid palindrome, other than the middle digit in an odd-length palindrome, every digit needs to exist on both sides.",
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"A longer palindrome implies a larger valued palindrome. For palindromes of the same length, the larger digits should occur first.",
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"We can count the occurrences of each digit and build the palindrome starting from the ends. Starting from the larger digits, if there are still at least 2 occurrences of a digit, we can place these digits on each side.",
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"Make sure to consider the special case for the center digit (if any) and zeroes. There should not be leading zeroes."
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],
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"sampleTestCase": "\"444947137\"",
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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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