mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
183 lines
22 KiB
JSON
183 lines
22 KiB
JSON
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"questionId": "2044",
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"categoryTitle": "Algorithms",
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"title": "Number of Wonderful Substrings",
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"content": "<p>A <strong>wonderful</strong> string is a string where <strong>at most one</strong> letter appears an <strong>odd</strong> number of times.</p>\r\n\r\n<ul>\r\n\t<li>For example, <code>"ccjjc"</code> and <code>"abab"</code> are wonderful, but <code>"ab"</code> is not.</li>\r\n</ul>\r\n\r\n<p>Given a string <code>word</code> that consists of the first ten lowercase English letters (<code>'a'</code> through <code>'j'</code>), return <em>the <strong>number of wonderful non-empty substrings</strong> in </em><code>word</code><em>. If the same substring appears multiple times in </em><code>word</code><em>, then count <strong>each occurrence</strong> separately.</em></p>\r\n\r\n<p>A <strong>substring</strong> is a contiguous sequence of characters in a string.</p>\r\n\r\n<p> </p>\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> word = "aba"\r\n<strong>Output:</strong> 4\r\n<strong>Explanation:</strong> The four wonderful substrings are underlined below:\r\n- "<u><strong>a</strong></u>ba" -> "a"\r\n- "a<u><strong>b</strong></u>a" -> "b"\r\n- "ab<u><strong>a</strong></u>" -> "a"\r\n- "<u><strong>aba</strong></u>" -> "aba"\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> word = "aabb"\r\n<strong>Output:</strong> 9\r\n<strong>Explanation:</strong> The nine wonderful substrings are underlined below:\r\n- "<strong><u>a</u></strong>abb" -> "a"\r\n- "<u><strong>aa</strong></u>bb" -> "aa"\r\n- "<u><strong>aab</strong></u>b" -> "aab"\r\n- "<u><strong>aabb</strong></u>" -> "aabb"\r\n- "a<u><strong>a</strong></u>bb" -> "a"\r\n- "a<u><strong>abb</strong></u>" -> "abb"\r\n- "aa<u><strong>b</strong></u>b" -> "b"\r\n- "aa<u><strong>bb</strong></u>" -> "bb"\r\n- "aab<u><strong>b</strong></u>" -> "b"\r\n</pre>\r\n\r\n<p><strong>Example 3:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> word = "he"\r\n<strong>Output:</strong> 2\r\n<strong>Explanation:</strong> The two wonderful substrings are underlined below:\r\n- "<b><u>h</u></b>e" -> "h"\r\n- "h<strong><u>e</u></strong>" -> "e"\r\n</pre>\r\n\r\n<p> </p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>1 <= word.length <= 10<sup>5</sup></code></li>\r\n\t<li><code>word</code> consists of lowercase English letters from <code>'a'</code> to <code>'j'</code>.</li>\r\n</ul>",
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"translatedTitle": "最美子字符串的数目",
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"translatedContent": "<p>如果某个字符串中 <strong>至多一个</strong> 字母出现 <strong>奇数</strong> 次，则称其为 <strong>最美</strong> 字符串。</p>\n\n<ul>\n\t<li>例如，<code>\"ccjjc\"</code> 和 <code>\"abab\"</code> 都是最美字符串，但 <code>\"ab\"</code> 不是。</li>\n</ul>\n\n<p>给你一个字符串 <code>word</code> ，该字符串由前十个小写英文字母组成（<code>'a'</code> 到 <code>'j'</code>）。请你返回 <code>word</code> 中 <strong>最美非空子字符串</strong> 的数目<em>。</em>如果同样的子字符串在<em> </em><code>word</code> 中出现多次，那么应当对 <strong>每次出现</strong> 分别计数<em>。</em></p>\n\n<p><strong>子字符串</strong> 是字符串中的一个连续字符序列。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>word = \"aba\"\n<strong>输出：</strong>4\n<strong>解释：</strong>4 个最美子字符串如下所示：\n- \"<strong>a</strong>ba\" -> \"a\"\n- \"a<strong>b</strong>a\" -> \"b\"\n- \"ab<strong>a</strong>\" -> \"a\"\n- \"<strong>aba</strong>\" -> \"aba\"\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>word = \"aabb\"\n<strong>输出：</strong>9\n<strong>解释：</strong>9 个最美子字符串如下所示：\n- \"<strong>a</strong>abb\" -> \"a\"\n- \"<strong>aa</strong>bb\" -> \"aa\"\n- \"<strong>aab</strong>b\" -> \"aab\"\n- \"<strong>aabb</strong>\" -> \"aabb\"\n- \"a<strong>a</strong>bb\" -> \"a\"\n- \"a<strong>abb</strong>\" -> \"abb\"\n- \"aa<strong>b</strong>b\" -> \"b\"\n- \"aa<strong>bb</strong>\" -> \"bb\"\n- \"aab<strong>b</strong>\" -> \"b\"\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>word = \"he\"\n<strong>输出：</strong>2\n<strong>解释：</strong>2 个最美子字符串如下所示：\n- \"<b>h</b>e\" -> \"h\"\n- \"h<strong>e</strong>\" -> \"e\"\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= word.length <= 10<sup>5</sup></code></li>\n\t<li><code>word</code> 由从 <code>'a'</code> 到 <code>'j'</code> 的小写英文字母组成</li>\n</ul>\n",
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"For each prefix of the string, check which characters are of even frequency and which are not and represent it by a bitmask.",
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