leetcode-problemset/leetcode-cn/originData/decode-ways.json

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            "title": "Decode Ways",
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            "content": "<p>A message containing letters from <code>A-Z</code> can be <strong>encoded</strong> into numbers using the following mapping:</p>\n\n<pre>\n&#39;A&#39; -&gt; &quot;1&quot;\n&#39;B&#39; -&gt; &quot;2&quot;\n...\n&#39;Z&#39; -&gt; &quot;26&quot;\n</pre>\n\n<p>To <strong>decode</strong> an encoded message, all the digits must be grouped then mapped back into letters using the reverse of the mapping above (there may be multiple ways). For example, <code>&quot;11106&quot;</code> can be mapped into:</p>\n\n<ul>\n\t<li><code>&quot;AAJF&quot;</code> with the grouping <code>(1 1 10 6)</code></li>\n\t<li><code>&quot;KJF&quot;</code> with the grouping <code>(11 10 6)</code></li>\n</ul>\n\n<p>Note that the grouping <code>(1 11 06)</code> is invalid because <code>&quot;06&quot;</code> cannot be mapped into <code>&#39;F&#39;</code> since <code>&quot;6&quot;</code> is different from <code>&quot;06&quot;</code>.</p>\n\n<p>Given a string <code>s</code> containing only digits, return <em>the <strong>number</strong> of ways to <strong>decode</strong> it</em>.</p>\n\n<p>The test cases are generated so that the answer fits in a <strong>32-bit</strong> integer.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;12&quot;\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> &quot;12&quot; could be decoded as &quot;AB&quot; (1 2) or &quot;L&quot; (12).\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;226&quot;\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> &quot;226&quot; could be decoded as &quot;BZ&quot; (2 26), &quot;VF&quot; (22 6), or &quot;BBF&quot; (2 2 6).\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;06&quot;\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> &quot;06&quot; cannot be mapped to &quot;F&quot; because of the leading zero (&quot;6&quot; is different from &quot;06&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;= 100</code></li>\n\t<li><code>s</code> contains only digits and may contain leading zero(s).</li>\n</ul>\n",
            "translatedTitle": "解码方法",
            "translatedContent": "<p>一条包含字母&nbsp;<code>A-Z</code> 的消息通过以下映射进行了 <strong>编码</strong> ：</p>\n\n<pre>\n'A' -&gt; \"1\"\n'B' -&gt; \"2\"\n...\n'Z' -&gt; \"26\"</pre>\n\n<p>要 <strong>解码</strong> 已编码的消息，所有数字必须基于上述映射的方法，反向映射回字母（可能有多种方法）。例如，<code>\"11106\"</code> 可以映射为：</p>\n\n<ul>\n\t<li><code>\"AAJF\"</code> ，将消息分组为 <code>(1 1 10 6)</code></li>\n\t<li><code>\"KJF\"</code> ，将消息分组为 <code>(11 10 6)</code></li>\n</ul>\n\n<p>注意，消息不能分组为&nbsp; <code>(1 11 06)</code> ，因为 <code>\"06\"</code> 不能映射为 <code>\"F\"</code> ，这是由于 <code>\"6\"</code> 和 <code>\"06\"</code> 在映射中并不等价。</p>\n\n<p>给你一个只含数字的 <strong>非空 </strong>字符串 <code>s</code> ，请计算并返回 <strong>解码</strong> 方法的 <strong>总数</strong> 。</p>\n\n<p>题目数据保证答案肯定是一个 <strong>32 位</strong> 的整数。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"12\"\n<strong>输出：</strong>2\n<strong>解释：</strong>它可以解码为 \"AB\"（1 2）或者 \"L\"（12）。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"226\"\n<strong>输出：</strong>3\n<strong>解释：</strong>它可以解码为 \"BZ\" (2 26), \"VF\" (22 6), 或者 \"BBF\" (2 2 6) 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"0\"\n<strong>输出：</strong>0\n<strong>解释：</strong>没有字符映射到以 0 开头的数字。\n含有 0 的有效映射是 'J' -&gt; \"10\" 和 'T'-&gt; \"20\" 。\n由于没有字符，因此没有有效的方法对此进行解码，因为所有数字都需要映射。\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;= 100</code></li>\n\t<li><code>s</code> 只包含数字，并且可能包含前导零。</li>\n</ul>\n",
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