leetcode-problemset/leetcode-cn/originData/palindrome-pairs.json

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        "question": {
            "questionId": "336",
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            "categoryTitle": "Algorithms",
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            "title": "Palindrome Pairs",
            "titleSlug": "palindrome-pairs",
            "content": "<p>You are given a <strong>0-indexed</strong> array of <strong>unique</strong> strings <code>words</code>.</p>\n\n<p>A <strong>palindrome pair</strong> is a pair of integers <code>(i, j)</code> such that:</p>\n\n<ul>\n\t<li><code>0 &lt;= i, j &lt; words.length</code>,</li>\n\t<li><code>i != j</code>, and</li>\n\t<li><code>words[i] + words[j]</code> (the concatenation of the two strings) is a <span data-keyword=\"palindrome-string\">palindrome</span>.</li>\n</ul>\n\n<p>Return <em>an array of all the <strong>palindrome pairs</strong> of </em><code>words</code>.</p>\n\n<p>You must write an algorithm with&nbsp;<code>O(sum of words[i].length)</code>&nbsp;runtime complexity.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;abcd&quot;,&quot;dcba&quot;,&quot;lls&quot;,&quot;s&quot;,&quot;sssll&quot;]\n<strong>Output:</strong> [[0,1],[1,0],[3,2],[2,4]]\n<strong>Explanation:</strong> The palindromes are [&quot;abcddcba&quot;,&quot;dcbaabcd&quot;,&quot;slls&quot;,&quot;llssssll&quot;]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;bat&quot;,&quot;tab&quot;,&quot;cat&quot;]\n<strong>Output:</strong> [[0,1],[1,0]]\n<strong>Explanation:</strong> The palindromes are [&quot;battab&quot;,&quot;tabbat&quot;]\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;a&quot;,&quot;&quot;]\n<strong>Output:</strong> [[0,1],[1,0]]\n<strong>Explanation:</strong> The palindromes are [&quot;a&quot;,&quot;a&quot;]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words.length &lt;= 5000</code></li>\n\t<li><code>0 &lt;= words[i].length &lt;= 300</code></li>\n\t<li><code>words[i]</code> consists of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "回文对",
            "translatedContent": "<p>给定一个由唯一字符串构成的 <strong>0 索引&nbsp;</strong>数组 <code>words</code>&nbsp;。</p>\n\n<p><strong>回文对</strong> 是一对整数 <code>(i, j)</code> ，满足以下条件：</p>\n\n<ul>\n\t<li><code>0 &lt;= i, j &lt; words.length</code>，</li>\n\t<li><code>i != j</code> ，并且</li>\n\t<li><code>words[i] + words[j]</code>（两个字符串的连接）是一个回文。</li>\n</ul>\n\n<p>返回一个数组，它包含&nbsp;<code>words</code> 中所有满足 <strong>回文对</strong> 条件的字符串。</p>\n\n<p>你必须设计一个时间复杂度为 <code>O(sum of words[i].length)</code> 的算法。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [\"abcd\",\"dcba\",\"lls\",\"s\",\"sssll\"]\n<strong>输出：</strong>[[0,1],[1,0],[3,2],[2,4]] \n<strong>解释：</strong>可拼接成的回文串为 <code>[\"dcbaabcd\",\"abcddcba\",\"slls\",\"llssssll\"]</code>\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [\"bat\",\"tab\",\"cat\"]\n<strong>输出：</strong>[[0,1],[1,0]] \n<strong>解释：</strong>可拼接成的回文串为 <code>[\"battab\",\"tabbat\"]</code></pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [\"a\",\"\"]\n<strong>输出：</strong>[[0,1],[1,0]]\n</pre>\n&nbsp;\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words.length &lt;= 5000</code></li>\n\t<li><code>0 &lt;= words[i].length &lt;= 300</code></li>\n\t<li><code>words[i]</code> 由小写英文字母组成</li>\n</ul>\n",
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                    "code": "class Solution {\npublic:\n    vector<vector<int>> palindromePairs(vector<string>& words) {\n        \n    }\n};",
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                    "code": "class Solution {\n    public List<List<Integer>> palindromePairs(String[] words) {\n\n    }\n}",
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                    "code": "class Solution(object):\n    def palindromePairs(self, words):\n        \"\"\"\n        :type words: List[str]\n        :rtype: List[List[int]]\n        \"\"\"",
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                    "code": "class Solution:\n    def palindromePairs(self, words: List[str]) -> List[List[int]]:",
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                    "code": "/**\n * Return an array of arrays of size *returnSize.\n * The sizes of the arrays are returned as *returnColumnSizes array.\n * Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().\n */\nint** palindromePairs(char** words, int wordsSize, int* returnSize, int** returnColumnSizes) {\n    \n}",
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                    "code": "public class Solution {\n    public IList<IList<int>> PalindromePairs(string[] words) {\n\n    }\n}",
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                    "lang": "JavaScript",
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                    "code": "/**\n * @param {string[]} words\n * @return {number[][]}\n */\nvar palindromePairs = function(words) {\n\n};",
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                    "code": "function palindromePairs(words: string[]): number[][] {\n    \n};",
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                    "code": "class Solution {\n\n    /**\n     * @param String[] $words\n     * @return Integer[][]\n     */\n    function palindromePairs($words) {\n\n    }\n}",
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                    "code": "class Solution {\n    func palindromePairs(_ words: [String]) -> [[Int]] {\n\n    }\n}",
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                    "code": "class Solution {\n    fun palindromePairs(words: Array<String>): List<List<Int>> {\n\n    }\n}",
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                    "code": "class Solution {\n  List<List<int>> palindromePairs(List<String> words) {\n    \n  }\n}",
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                    "code": "func palindromePairs(words []string) [][]int {\n\n}",
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                    "code": "# @param {String[]} words\n# @return {Integer[][]}\ndef palindrome_pairs(words)\n\nend",
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                    "lang": "Scala",
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                    "code": "object Solution {\n    def palindromePairs(words: Array[String]): List[List[Int]] = {\n\n    }\n}",
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                    "lang": "Rust",
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                    "code": "impl Solution {\n    pub fn palindrome_pairs(words: Vec<String>) -> Vec<Vec<i32>> {\n\n    }\n}",
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                    "lang": "Racket",
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                    "code": "(define/contract (palindrome-pairs words)\n  (-> (listof string?) (listof (listof exact-integer?)))\n  )",
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                    "lang": "Erlang",
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                    "code": "-spec palindrome_pairs(Words :: [unicode:unicode_binary()]) -> [[integer()]].\npalindrome_pairs(Words) ->\n  .",
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                    "lang": "Elixir",
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                    "code": "defmodule Solution do\n  @spec palindrome_pairs(words :: [String.t]) :: [[integer]]\n  def palindrome_pairs(words) do\n    \n  end\nend",
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            "hints": [
                "Checking every two pairs will exceed the time limit. It will be O(n^2 * k). We need a faster way.",
                "If we hash every string in the array, how can we check if two pairs form a palindrome after the concatenation?",
                "We can check every string in words and consider it as words[j] (i.e., the suffix of the target palindrome). We can check if there is a hash of string that can be the prefix to make it a palindrome."
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