mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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181 lines
18 KiB
JSON
181 lines
18 KiB
JSON
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"questionId": "2276",
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"questionFrontendId": "2157",
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"boundTopicId": null,
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"title": "Groups of Strings",
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"titleSlug": "groups-of-strings",
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"content": "<p>You are given a <strong>0-indexed</strong> array of strings <code>words</code>. Each string consists of <strong>lowercase English letters</strong> only. No letter occurs more than once in any string of <code>words</code>.</p>\n\n<p>Two strings <code>s1</code> and <code>s2</code> are said to be <strong>connected</strong> if the set of letters of <code>s2</code> can be obtained from the set of letters of <code>s1</code> by any <strong>one</strong> of the following operations:</p>\n\n<ul>\n\t<li>Adding exactly one letter to the set of the letters of <code>s1</code>.</li>\n\t<li>Deleting exactly one letter from the set of the letters of <code>s1</code>.</li>\n\t<li>Replacing exactly one letter from the set of the letters of <code>s1</code> with any letter, <strong>including</strong> itself.</li>\n</ul>\n\n<p>The array <code>words</code> can be divided into one or more non-intersecting <strong>groups</strong>. A string belongs to a group if any <strong>one</strong> of the following is true:</p>\n\n<ul>\n\t<li>It is connected to <strong>at least one</strong> other string of the group.</li>\n\t<li>It is the <strong>only</strong> string present in the group.</li>\n</ul>\n\n<p>Note that the strings in <code>words</code> should be grouped in such a manner that a string belonging to a group cannot be connected to a string present in any other group. It can be proved that such an arrangement is always unique.</p>\n\n<p>Return <em>an array</em> <code>ans</code> <em>of size</em> <code>2</code> <em>where:</em></p>\n\n<ul>\n\t<li><code>ans[0]</code> <em>is the <strong>maximum number</strong> of groups</em> <code>words</code> <em>can be divided into, and</em></li>\n\t<li><code>ans[1]</code> <em>is the <strong>size of the largest</strong> group</em>.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = ["a","b","ab","cde"]\n<strong>Output:</strong> [2,3]\n<strong>Explanation:</strong>\n- words[0] can be used to obtain words[1] (by replacing 'a' with 'b'), and words[2] (by adding 'b'). So words[0] is connected to words[1] and words[2].\n- words[1] can be used to obtain words[0] (by replacing 'b' with 'a'), and words[2] (by adding 'a'). So words[1] is connected to words[0] and words[2].\n- words[2] can be used to obtain words[0] (by deleting 'b'), and words[1] (by deleting 'a'). So words[2] is connected to words[0] and words[1].\n- words[3] is not connected to any string in words.\nThus, words can be divided into 2 groups ["a","b","ab"] and ["cde"]. The size of the largest group is 3. \n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = ["a","ab","abc"]\n<strong>Output:</strong> [1,3]\n<strong>Explanation:</strong>\n- words[0] is connected to words[1].\n- words[1] is connected to words[0] and words[2].\n- words[2] is connected to words[1].\nSince all strings are connected to each other, they should be grouped together.\nThus, the size of the largest group is 3.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= words.length <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= words[i].length <= 26</code></li>\n\t<li><code>words[i]</code> consists of lowercase English letters only.</li>\n\t<li>No letter occurs more than once in <code>words[i]</code>.</li>\n</ul>\n",
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"difficulty": "Hard",
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"likes": 444,
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"similarQuestions": "[{\"title\": \"Word Ladder II\", \"titleSlug\": \"word-ladder-ii\", \"difficulty\": \"Hard\", \"translatedTitle\": null}, {\"title\": \"Similar String Groups\", \"titleSlug\": \"similar-string-groups\", \"difficulty\": \"Hard\", \"translatedTitle\": null}, {\"title\": \"Largest Component Size by Common Factor\", \"titleSlug\": \"largest-component-size-by-common-factor\", \"difficulty\": \"Hard\", \"translatedTitle\": null}]",
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"exampleTestcases": "[\"a\",\"b\",\"ab\",\"cde\"]\n[\"a\",\"ab\",\"abc\"]",
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"categoryTitle": "Algorithms",
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"name": "String",
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"name": "Bit Manipulation",
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"code": "class Solution {\npublic:\n vector<int> groupStrings(vector<string>& words) {\n \n }\n};",
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"code": "class Solution(object):\n def groupStrings(self, words):\n \"\"\"\n :type words: List[str]\n :rtype: List[int]\n \"\"\"\n ",
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"lang": "Kotlin",
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"code": "# @param {String[]} words\n# @return {Integer[]}\ndef group_strings(words)\n \nend",
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"code": "object Solution {\n def groupStrings(words: Array[String]): Array[Int] = {\n \n }\n}",
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"code": "impl Solution {\n pub fn group_strings(words: Vec<String>) -> Vec<i32> {\n \n }\n}",
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"code": "(define/contract (group-strings words)\n (-> (listof string?) (listof exact-integer?))\n )",
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"code": "-spec group_strings(Words :: [unicode:unicode_binary()]) -> [integer()].\ngroup_strings(Words) ->\n .",
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"hints": [
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"Can we build a graph from words, where there exists an edge between nodes i and j if words[i] and words[j] are connected?",
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"The problem now boils down to finding the total number of components and the size of the largest component in the graph.",
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"How can we use bit masking to reduce the search space while adding edges to node i?"
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],
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"sampleTestCase": "[\"a\",\"b\",\"ab\",\"cde\"]",
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