leetcode-problemset/leetcode-cn/originData/distinct-subsequences-ii.json

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            "title": "Distinct Subsequences II",
            "titleSlug": "distinct-subsequences-ii",
            "content": "<p>Given a string s, return <em>the number of <strong>distinct non-empty subsequences</strong> of</em> <code>s</code>. Since the answer may be very large, return it <strong>modulo</strong> <code>10<sup>9</sup> + 7</code>.</p>\nA <strong>subsequence</strong> of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i.e., <code>&quot;ace&quot;</code> is a subsequence of <code>&quot;<u>a</u>b<u>c</u>d<u>e</u>&quot;</code> while <code>&quot;aec&quot;</code> is not.\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;abc&quot;\n<strong>Output:</strong> 7\n<strong>Explanation:</strong> The 7 distinct subsequences are &quot;a&quot;, &quot;b&quot;, &quot;c&quot;, &quot;ab&quot;, &quot;ac&quot;, &quot;bc&quot;, and &quot;abc&quot;.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aba&quot;\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> The 6 distinct subsequences are &quot;a&quot;, &quot;b&quot;, &quot;ab&quot;, &quot;aa&quot;, &quot;ba&quot;, and &quot;aba&quot;.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aaa&quot;\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The 3 distinct subsequences are &quot;a&quot;, &quot;aa&quot; and &quot;aaa&quot;.\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;= 2000</code></li>\n\t<li><code>s</code> consists of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "不同的子序列 II",
            "translatedContent": "<p>给定一个字符串 <code>s</code>，计算 <code>s</code> 的 <strong>不同非空子序列</strong> 的个数。因为结果可能很大，所以返回答案需要对<strong> </strong><strong><code>10^9 + 7</code> 取余</strong> 。</p>\n\n<p>字符串的 <strong>子序列</strong> 是经由原字符串删除一些（也可能不删除）字符但不改变剩余字符相对位置的一个新字符串。</p>\n\n<ul>\n\t<li>例如，<code>\"ace\"</code> 是 <code>\"<em><strong>a</strong></em>b<em><strong>c</strong></em>d<em><strong>e</strong></em>\"</code> 的一个子序列，但 <code>\"aec\"</code> 不是。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"abc\"\n<strong>输出：</strong>7\n<strong>解释：</strong>7 个不同的子序列分别是 \"a\", \"b\", \"c\", \"ab\", \"ac\", \"bc\", 以及 \"abc\"。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"aba\"\n<strong>输出：</strong>6\n<strong>解释：</strong>6 个不同的子序列分别是 \"a\", \"b\", \"ab\", \"ba\", \"aa\" 以及 \"aba\"。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"aaa\"\n<strong>输出：</strong>3\n<strong>解释：</strong>3 个不同的子序列分别是 \"a\", \"aa\" 以及 \"aaa\"。\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;= 2000</code></li>\n\t<li><code>s</code> 仅由小写英文字母组成</li>\n</ul>\n\n<p>&nbsp;</p>\n",
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