mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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182 lines
17 KiB
JSON
182 lines
17 KiB
JSON
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"questionId": "393",
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"title": "UTF-8 Validation",
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"titleSlug": "utf-8-validation",
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"content": "<p>Given an integer array <code>data</code> representing the data, return whether it is a valid <strong>UTF-8</strong> encoding (i.e. it translates to a sequence of valid UTF-8 encoded characters).</p>\n\n<p>A character in <strong>UTF8</strong> can be from <strong>1 to 4 bytes</strong> long, subjected to the following rules:</p>\n\n<ol>\n\t<li>For a <strong>1-byte</strong> character, the first bit is a <code>0</code>, followed by its Unicode code.</li>\n\t<li>For an <strong>n-bytes</strong> character, the first <code>n</code> bits are all one's, the <code>n + 1</code> bit is <code>0</code>, followed by <code>n - 1</code> bytes with the most significant <code>2</code> bits being <code>10</code>.</li>\n</ol>\n\n<p>This is how the UTF-8 encoding would work:</p>\n\n<pre>\n Number of Bytes | UTF-8 Octet Sequence\n | (binary)\n --------------------+-----------------------------------------\n 1 | 0xxxxxxx\n 2 | 110xxxxx 10xxxxxx\n 3 | 1110xxxx 10xxxxxx 10xxxxxx\n 4 | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx\n</pre>\n\n<p><code>x</code> denotes a bit in the binary form of a byte that may be either <code>0</code> or <code>1</code>.</p>\n\n<p><strong>Note: </strong>The input is an array of integers. Only the <strong>least significant 8 bits</strong> of each integer is used to store the data. This means each integer represents only 1 byte of data.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> data = [197,130,1]\n<strong>Output:</strong> true\n<strong>Explanation:</strong> data represents the octet sequence: 11000101 10000010 00000001.\nIt is a valid utf-8 encoding for a 2-bytes character followed by a 1-byte character.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> data = [235,140,4]\n<strong>Output:</strong> false\n<strong>Explanation:</strong> data represented the octet sequence: 11101011 10001100 00000100.\nThe first 3 bits are all one's and the 4th bit is 0 means it is a 3-bytes character.\nThe next byte is a continuation byte which starts with 10 and that's correct.\nBut the second continuation byte does not start with 10, so it is invalid.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= data.length <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>0 <= data[i] <= 255</code></li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "[197,130,1]\n[235,140,4]",
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"categoryTitle": "Algorithms",
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"name": "Array",
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"name": "Bit Manipulation",
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"code": "class Solution {\npublic:\n bool validUtf8(vector<int>& data) {\n \n }\n};",
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"code": "class Solution {\n public boolean validUtf8(int[] data) {\n \n }\n}",
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"lang": "Python",
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"code": "class Solution(object):\n def validUtf8(self, data):\n \"\"\"\n :type data: List[int]\n :rtype: bool\n \"\"\"\n ",
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"code": "# @param {Integer[]} data\n# @return {Boolean}\ndef valid_utf8(data)\n \nend",
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"lang": "Scala",
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"code": "impl Solution {\n pub fn valid_utf8(data: Vec<i32>) -> bool {\n \n }\n}",
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"lang": "Racket",
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"code": "(define/contract (valid-utf8 data)\n (-> (listof exact-integer?) boolean?)\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec valid_utf8(Data :: [integer()]) -> boolean().\nvalid_utf8(Data) ->\n .",
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"code": "defmodule Solution do\n @spec valid_utf8(data :: [integer]) :: boolean\n def valid_utf8(data) do\n \n end\nend",
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"stats": "{\"totalAccepted\": \"119.9K\", \"totalSubmission\": \"266.4K\", \"totalAcceptedRaw\": 119862, \"totalSubmissionRaw\": 266422, \"acRate\": \"45.0%\"}",
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"hints": [
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"Read the data integer by integer. When you read it, process the least significant 8 bits of it.",
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"Assume the next encoding is 1-byte data. If it is not 1-byte data, read the next integer and assume it is 2-bytes data.",
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"Similarly, if it is not 2-bytes data, try 3-bytes then 4-bytes. If you read four integers and it still does not match any pattern, return false."
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"sampleTestCase": "[197,130,1]",
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For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu11 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</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>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. 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