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21dk04.json
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{
"data": {
"question": {
"questionId": "1000280",
"questionFrontendId": "剑指 Offer II 097",
"categoryTitle": "LCOF2",
"boundTopicId": 910277,
"title": "子序列的数目",
"titleSlug": "21dk04",
"content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
"translatedTitle": "子序列的数目",
"translatedContent": "<p>给定一个字符串 <code>s</code><strong> </strong>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>"ACE"</code> 是 <code>"ABCDE"</code> 的一个子序列，而 <code>"AEC"</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> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = "rabbbit", t = "rabbit"<code>\n<strong>输出</strong></code><strong>：</strong><code>3\n</code><strong>解释：</strong>\n如下图所示, 有 3 种可以从 s 中得到 <code>"rabbit" 的方案</code>。\n<code><strong><u>rabb</u></strong>b<strong><u>it</u></strong></code>\n<code><strong><u>ra</u></strong>b<strong><u>bbit</u></strong></code>\n<code><strong><u>rab</u></strong>b<strong><u>bit</u></strong></code></pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = "babgbag", t = "bag"\n<code><strong>输出</strong></code><strong>：</strong><code>5\n</code><strong>解释：</strong>\n如下图所示, 有 5 种可以从 s 中得到 <code>"bag" 的方案</code>。 \n<code><strong><u>ba</u></strong>b<u><strong>g</strong></u>bag</code>\n<code><strong><u>ba</u></strong>bgba<strong><u>g</u></strong></code>\n<code><u><strong>b</strong></u>abgb<strong><u>ag</u></strong></code>\n<code>ba<u><strong>b</strong></u>gb<u><strong>ag</strong></u></code>\n<code>babg<strong><u>bag</u></strong></code>\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>0 <= s.length, t.length <= 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> </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",
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"code": "class Solution {\npublic:\n int numDistinct(string s, string t) {\n\n }\n};",
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"lang": "Erlang",
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