leetcode-problemset/leetcode-cn/originData/valid-number.json

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            "questionId": "65",
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            "categoryTitle": "Algorithms",
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            "title": "Valid Number",
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            "content": "<p>Given a string <code>s</code>, return whether <code>s</code> is a <strong>valid number</strong>.<br />\n<br />\nFor example, all the following are valid numbers: <code>&quot;2&quot;, &quot;0089&quot;, &quot;-0.1&quot;, &quot;+3.14&quot;, &quot;4.&quot;, &quot;-.9&quot;, &quot;2e10&quot;, &quot;-90E3&quot;, &quot;3e+7&quot;, &quot;+6e-1&quot;, &quot;53.5e93&quot;, &quot;-123.456e789&quot;</code>, while the following are not valid numbers: <code>&quot;abc&quot;, &quot;1a&quot;, &quot;1e&quot;, &quot;e3&quot;, &quot;99e2.5&quot;, &quot;--6&quot;, &quot;-+3&quot;, &quot;95a54e53&quot;</code>.</p>\n\n<p>Formally, a&nbsp;<strong>valid number</strong> is defined using one of the following definitions:</p>\n\n<ol>\n\t<li>An <strong>integer number</strong> followed by an <strong>optional exponent</strong>.</li>\n\t<li>A <strong>decimal number</strong> followed by an <strong>optional exponent</strong>.</li>\n</ol>\n\n<p>An <strong>integer number</strong> is defined with an <strong>optional sign</strong> <code>&#39;-&#39;</code> or <code>&#39;+&#39;</code> followed by <strong>digits</strong>.</p>\n\n<p>A <strong>decimal number</strong> is defined with an <strong>optional sign</strong> <code>&#39;-&#39;</code> or <code>&#39;+&#39;</code> followed by one of the following definitions:</p>\n\n<ol>\n\t<li><strong>Digits</strong> followed by a <strong>dot</strong> <code>&#39;.&#39;</code>.</li>\n\t<li><strong>Digits</strong> followed by a <strong>dot</strong> <code>&#39;.&#39;</code> followed by <strong>digits</strong>.</li>\n\t<li>A <strong>dot</strong> <code>&#39;.&#39;</code> followed by <strong>digits</strong>.</li>\n</ol>\n\n<p>An <strong>exponent</strong> is defined with an <strong>exponent notation</strong> <code>&#39;e&#39;</code> or <code>&#39;E&#39;</code> followed by an <strong>integer number</strong>.</p>\n\n<p>The <strong>digits</strong> are defined as one or more digits.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;0&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">true</span></p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;e&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">false</span></p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;.&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">false</span></p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 20</code></li>\n\t<li><code>s</code> consists of only English letters (both uppercase and lowercase), digits (<code>0-9</code>), plus <code>&#39;+&#39;</code>, minus <code>&#39;-&#39;</code>, or dot <code>&#39;.&#39;</code>.</li>\n</ul>\n",
            "translatedTitle": "有效数字",
            "translatedContent": "<p>给定一个字符串&nbsp;<code>s</code>&nbsp;，返回&nbsp;<code>s</code>&nbsp;是否是一个 <strong>有效数字</strong>。</p>\n\n<p>例如，下面的都是有效数字：<code>\"2\", \"0089\", \"-0.1\", \"+3.14\", \"4.\", \"-.9\", \"2e10\", \"-90E3\", \"3e+7\", \"+6e-1\", \"53.5e93\", \"-123.456e789\"</code>，而接下来的不是：<code>\"abc\", \"1a\", \"1e\", \"e3\", \"99e2.5\", \"--6\", \"-+3\", \"95a54e53\"</code>。</p>\n\n<p>一般的，一个 <strong>有效数字</strong>&nbsp;可以用以下的规则之一定义：</p>\n\n<ol>\n\t<li>一个 <strong>整数</strong> 后面跟着一个 <strong>可选指数</strong>。</li>\n\t<li>一个 <strong>十进制数</strong> 后面跟着一个&nbsp;<strong>可选指数</strong>。</li>\n</ol>\n\n<p>一个 <strong>整数</strong> 定义为一个&nbsp;<strong>可选符号</strong>&nbsp;<code>'-'</code>&nbsp;或&nbsp;<code>'+'</code>&nbsp;后面跟着 <strong>数字</strong>。</p>\n\n<p>一个 <strong>十进制数</strong>&nbsp;定义为一个&nbsp;<strong>可选符号&nbsp;</strong><code>'-'</code>&nbsp;或&nbsp;<code>'+'</code>&nbsp;后面跟着下述规则：</p>\n\n<ol>\n\t<li><strong>数字&nbsp;</strong>后跟着一个 <strong>小数点&nbsp;<code>.</code></strong>。</li>\n\t<li><strong>数字&nbsp;</strong>后跟着一个 <strong>小数点&nbsp;<code>.</code>&nbsp;</strong>再跟着<strong> 数位</strong>。</li>\n\t<li>一个 <strong>小数点&nbsp;<code>.</code>&nbsp;</strong>后跟着<strong> 数位</strong>。</li>\n</ol>\n\n<p><strong>指数</strong> 定义为指数符号 <code>'e'</code> 或 <code>'E'</code>，后面跟着一个 <b>整数</b>。</p>\n\n<p><strong>数字</strong>&nbsp;定义为一个或多个数位。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \"0\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">true</span></p>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \"e\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">false</span></p>\n</div>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \".\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">false</span></p>\n</div>\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;= 20</code></li>\n\t<li><code>s</code> 仅含英文字母（大写和小写），数字（<code>0-9</code>），加号 <code>'+'</code> ，减号 <code>'-'</code> ，或者点 <code>'.'</code> 。</li>\n</ul>\n",
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