leetcode-problemset/leetcode-cn/originData/find-longest-awesome-substring.json

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        "question": {
            "questionId": "1668",
            "questionFrontendId": "1542",
            "categoryTitle": "Algorithms",
            "boundTopicId": 364422,
            "title": "Find Longest Awesome Substring",
            "titleSlug": "find-longest-awesome-substring",
            "content": "<p>You are given a string <code>s</code>. An <strong>awesome</strong> substring is a non-empty substring of <code>s</code> such that we can make any number of swaps in order to make it a palindrome.</p>\n\n<p>Return <em>the length of the maximum length <strong>awesome substring</strong> of</em> <code>s</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;3242415&quot;\n<strong>Output:</strong> 5\n<strong>Explanation:</strong> &quot;24241&quot; is the longest awesome substring, we can form the palindrome &quot;24142&quot; with some swaps.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;12345678&quot;\n<strong>Output:</strong> 1\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;213123&quot;\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> &quot;213123&quot; is the longest awesome substring, we can form the palindrome &quot;231132&quot; with some swaps.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists only of digits.</li>\n</ul>\n",
            "translatedTitle": "找出最长的超赞子字符串",
            "translatedContent": "<p>给你一个字符串 <code>s</code> 。请返回 <code>s</code> 中最长的 <strong>超赞子字符串</strong> 的长度。</p>\n\n<p>「超赞子字符串」需满足满足下述两个条件：</p>\n\n<ul>\n\t<li>该字符串是 <code>s</code> 的一个非空子字符串</li>\n\t<li>进行任意次数的字符交换后，该字符串可以变成一个回文字符串</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>s = &quot;3242415&quot;\n<strong>输出：</strong>5\n<strong>解释：</strong>&quot;24241&quot; 是最长的超赞子字符串，交换其中的字符后，可以得到回文 &quot;24142&quot;\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>s = &quot;12345678&quot;\n<strong>输出：</strong>1\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>s = &quot;213123&quot;\n<strong>输出：</strong>6\n<strong>解释：</strong>&quot;213123&quot; 是最长的超赞子字符串，交换其中的字符后，可以得到回文 &quot;231132&quot;\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre><strong>输入：</strong>s = &quot;00&quot;\n<strong>输出：</strong>2\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10^5</code></li>\n\t<li><code>s</code> 仅由数字组成</li>\n</ul>\n",
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            "hints": [
                "Given the character counts, under what conditions can a palindrome be formed ?",
                "From left to right, use bitwise xor-operation to compute for any prefix the number of times modulo 2 of each digit.  (mask ^= (1<<(s[i]-'0')).",
                "Expected complexity is O(n*A) where A is the alphabet (10)."
            ],
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