mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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168 lines
21 KiB
JSON
168 lines
21 KiB
JSON
{
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"questionId": "100340",
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"categoryTitle": "Algorithms",
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"boundTopicId": 88087,
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"title": "把字符串转换成整数 (atoi)",
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"titleSlug": "ba-zi-fu-chuan-zhuan-huan-cheng-zheng-shu-lcof",
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"content": "English description is not available for the problem. Please switch to Chinese.",
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"translatedTitle": "把字符串转换成整数 (atoi)",
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"translatedContent": "<p>请你来实现一个 <code>myAtoi(string s)</code> 函数，使其能将字符串转换成一个 32 位有符号整数（类似 C/C++ 中的 <code>atoi</code> 函数）。</p>\n\n<p>函数 <code>myAtoi(string s)</code> 的算法如下：</p>\n\n<ol>\n\t<li>读入字符串并丢弃无用的前导空格</li>\n\t<li>检查下一个字符（假设还未到字符末尾）为正还是负号，读取该字符（如果有）。 确定最终结果是负数还是正数。 如果两者都不存在，则假定结果为正。</li>\n\t<li>读入下一个字符，直到到达下一个非数字字符或到达输入的结尾。字符串的其余部分将被忽略。</li>\n\t<li>将前面步骤读入的这些数字转换为整数（即，\"123\" -> 123， \"0032\" -> 32）。如果没有读入数字，则整数为 <code>0</code> 。必要时更改符号（从步骤 2 开始）。</li>\n\t<li>如果整数数超过 32 位有符号整数范围 <code>[−2<sup>31</sup>, 2<sup>31 </sup>− 1]</code> ，需要截断这个整数，使其保持在这个范围内。具体来说，小于 <code>−2<sup>31</sup></code> 的整数应该被固定为 <code>−2<sup>31</sup></code> ，大于 <code>2<sup>31 </sup>− 1</code> 的整数应该被固定为 <code>2<sup>31 </sup>− 1</code> 。</li>\n\t<li>返回整数作为最终结果。</li>\n</ol>\n\n<p><strong>注意：</strong></p>\n\n<ul>\n\t<li>本题中的空白字符只包括空格字符 <code>' '</code> 。</li>\n\t<li>除前导空格或数字后的其余字符串外，<strong>请勿忽略</strong> 任何其他字符。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"42\"\n<strong>输出：</strong>42\n<strong>解释：</strong>加粗的字符串为已经读入的字符，插入符号是当前读取的字符。\n第 1 步：\"42\"（当前没有读入字符，因为没有前导空格）\n ^\n第 2 步：\"42\"（当前没有读入字符，因为这里不存在 '-' 或者 '+'）\n ^\n第 3 步：\"<u>42</u>\"（读入 \"42\"）\n ^\n解析得到整数 42 。\n由于 \"42\" 在范围 [-2<sup>31</sup>, 2<sup>31</sup> - 1] 内，最终结果为 42 。</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \" -42\"\n<strong>输出：</strong>-42\n<strong>解释：</strong>\n第 1 步：\"<u><strong> </strong></u>-42\"（读入前导空格，但忽视掉）\n ^\n第 2 步：\" <u><strong>-</strong></u>42\"（读入 '-' 字符，所以结果应该是负数）\n ^\n第 3 步：\" <u><strong>-42</strong></u>\"（读入 \"42\"）\n ^\n解析得到整数 -42 。\n由于 \"-42\" 在范围 [-2<sup>31</sup>, 2<sup>31</sup> - 1] 内，最终结果为 -42 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"4193 with words\"\n<strong>输出：</strong>4193\n<strong>解释：</strong>\n第 1 步：\"4193 with words\"（当前没有读入字符，因为没有前导空格）\n ^\n第 2 步：\"4193 with words\"（当前没有读入字符，因为这里不存在 '-' 或者 '+'）\n ^\n第 3 步：\"<u>4193</u> with words\"（读入 \"4193\"；由于下一个字符不是一个数字，所以读入停止）\n ^\n解析得到整数 4193 。\n由于 \"4193\" 在范围 [-2<sup>31</sup>, 2<sup>31</sup> - 1] 内，最终结果为 4193 。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>0 <= s.length <= 200</code></li>\n\t<li><code>s</code> 由英文字母（大写和小写）、数字（<code>0-9</code>）、<code>' '</code>、<code>'+'</code>、<code>'-'</code> 和 <code>'.'</code> 组成</li>\n</ul>\n\n<p> </p>\n\n<p>注意：本题与主站 8 题相同：<a href=\"https://leetcode-cn.com/problems/string-to-integer-atoi/\">https://leetcode-cn.com/problems/string-to-integer-atoi/</a></p>\n\n<p> </p>\n",
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