leetcode-problemset/leetcode-cn/originData/21dk04.json

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            "questionId": "1000280",
            "questionFrontendId": "LCR 097",
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            "title": "不同的子序列",
            "titleSlug": "21dk04",
            "content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
            "translatedTitle": "不同的子序列",
            "translatedContent": "<p>给定一个字符串 <code>s</code> 和一个字符串 <code>t</code> ，计算在 <code>s</code> 的子序列中 <code>t</code> 出现的个数。</p>\n\n<p>字符串的一个 <strong>子序列</strong> 是指，通过删除一些（也可以不删除）字符且不干扰剩余字符相对位置所组成的新字符串。（例如，<code>&quot;ACE&quot;</code> 是 <code>&quot;ABCDE&quot;</code> 的一个子序列，而 <code>&quot;AEC&quot;</code> 不是）</p>\n\n<p>题目数据保证答案符合 32 位带符号整数范围。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = &quot;rabbbit&quot;, t = &quot;rabbit&quot;\n<strong>输出：</strong>3\n<strong>解释：</strong>\n如下图所示, 有 3 种可以从 s 中得到 &quot;rabbit&quot; 的方案。\n<strong><u>rabb</u></strong>b<strong><u>it</u></strong>\n<strong><u>ra</u></strong>b<strong><u>bbit</u></strong>\n<strong><u>rab</u></strong>b<strong><u>bit</u></strong></pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = &quot;babgbag&quot;, t = &quot;bag&quot;\n<strong>输出：</strong>5\n<strong>解释：</strong>\n如下图所示, 有 5 种可以从 s 中得到 &quot;bag&quot; 的方案。 \n<strong><u>ba</u></strong>b<u><strong>g</strong></u>bag\n<strong><u>ba</u></strong>bgba<strong><u>g</u></strong>\n<u><strong>b</strong></u>abgb<strong><u>ag</u></strong>\nba<u><strong>b</strong></u>gb<u><strong>ag</strong></u>\nbabg<strong><u>bag</u></strong>\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= s.length, t.length &lt;= 1000</code></li>\n\t<li><code>s</code> 和 <code>t</code> 由英文字母组成</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 115 题相同： <a href=\"https://leetcode-cn.com/problems/distinct-subsequences/\">https://leetcode-cn.com/problems/distinct-subsequences/</a></p>\n\n<p>&nbsp;</p>\n",
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