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"translatedContent": "<p>给定一个编码字符串 <code>S</code>。请你找出<em> </em><strong>解码字符串</strong> 并将其写入磁带。解码时,从编码字符串中<strong> 每次读取一个字符 </strong>,并采取以下步骤:</p>\n\n<ul>\n\t<li>如果所读的字符是字母,则将该字母写在磁带上。</li>\n\t<li>如果所读的字符是数字(例如 <code>d</code>),则整个当前磁带总共会被重复写&nbsp;<code>d-1</code> 次。</li>\n</ul>\n\n<p>现在,对于给定的编码字符串 <code>S</code> 和索引 <code>K</code>,查找并返回解码字符串中的第&nbsp;<code>K</code>&nbsp;个字母。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n\n<pre><strong>输入:</strong>S = &quot;leet2code3&quot;, K = 10\n<strong>输出:</strong>&quot;o&quot;\n<strong>解释:</strong>\n解码后的字符串为 &quot;leetleetcodeleetleetcodeleetleetcode&quot;。\n字符串中的第 10 个字母是 &quot;o&quot;。\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre><strong>输入:</strong>S = &quot;ha22&quot;, K = 5\n<strong>输出:</strong>&quot;h&quot;\n<strong>解释:</strong>\n解码后的字符串为 &quot;hahahaha&quot;。第 5 个字母是 &quot;h&quot;。\n</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre><strong>输入:</strong>S = &quot;a2345678999999999999999&quot;, K = 1\n<strong>输出:</strong>&quot;a&quot;\n<strong>解释:</strong>\n解码后的字符串为 &quot;a&quot; 重复 8301530446056247680 次。第 1 个字母是 &quot;a&quot;。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= S.length &lt;= 100</code></li>\n\t<li><code>S</code>&nbsp;只包含小写字母与数字 <code>2</code> 到 <code>9</code> 。</li>\n\t<li><code>S</code>&nbsp;以字母开头。</li>\n\t<li><code>1 &lt;= K &lt;= 10^9</code></li>\n\t<li>题目保证 <code>K</code> 小于或等于解码字符串的长度。</li>\n\t<li>解码后的字符串保证少于&nbsp;<code>2^63</code>&nbsp;个字母。</li>\n</ul>\n",
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