mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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181 lines
15 KiB
JSON
181 lines
15 KiB
JSON
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"title": "Find Lucky Integer in an Array",
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"content": "<p>Given an array of integers <code>arr</code>, a <strong>lucky integer</strong> is an integer that has a frequency in the array equal to its value.</p>\n\n<p>Return <em>the largest <strong>lucky integer</strong> in the array</em>. If there is no <strong>lucky integer</strong> return <code>-1</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [2,2,3,4]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The only lucky number in the array is 2 because frequency[2] == 2.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [1,2,2,3,3,3]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> 1, 2 and 3 are all lucky numbers, return the largest of them.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [2,2,2,3,3]\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> There are no lucky numbers in the array.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 500</code></li>\n\t<li><code>1 <= arr[i] <= 500</code></li>\n</ul>\n",
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"code": "class Solution(object):\n def findLucky(self, arr):\n \"\"\"\n :type arr: List[int]\n :rtype: int\n \"\"\"\n ",
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"code": "impl Solution {\n pub fn find_lucky(arr: Vec<i32>) -> i32 {\n \n }\n}",
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"code": "defmodule Solution do\n @spec find_lucky(arr :: [integer]) :: integer\n def find_lucky(arr) do\n \n end\nend",
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"hints": [
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"Count the frequency of each integer in the array.",
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"Get all lucky numbers and return the largest of them."
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],
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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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