leetcode-problemset/leetcode-cn/originData/ba-zi-fu-chuan-zhuan-huan-cheng-zheng-shu-lcof.json

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            "questionId": "100340",
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            "title": "把字符串转换成整数 LCOF",
            "titleSlug": "ba-zi-fu-chuan-zhuan-huan-cheng-zheng-shu-lcof",
            "content": "English description is not available for the problem. Please switch to Chinese.",
            "translatedTitle": "把字符串转换成整数",
            "translatedContent": "<p>写一个函数 StrToInt，实现把字符串转换成整数这个功能。不能使用 atoi 或者其他类似的库函数。</p>\n\n<p>&nbsp;</p>\n\n<p>首先，该函数会根据需要丢弃无用的开头空格字符，直到寻找到第一个非空格的字符为止。</p>\n\n<p>当我们寻找到的第一个非空字符为正或者负号时，则将该符号与之后面尽可能多的连续数字组合起来，作为该整数的正负号；假如第一个非空字符是数字，则直接将其与之后连续的数字字符组合起来，形成整数。</p>\n\n<p>该字符串除了有效的整数部分之后也可能会存在多余的字符，这些字符可以被忽略，它们对于函数不应该造成影响。</p>\n\n<p>注意：假如该字符串中的第一个非空格字符不是一个有效整数字符、字符串为空或字符串仅包含空白字符时，则你的函数不需要进行转换。</p>\n\n<p>在任何情况下，若函数不能进行有效的转换时，请返回 0。</p>\n\n<p><strong>说明：</strong></p>\n\n<p>假设我们的环境只能存储 32 位大小的有符号整数，那么其数值范围为&nbsp;[&minus;2<sup>31</sup>,&nbsp; 2<sup>31&nbsp;</sup>&minus; 1]。如果数值超过这个范围，请返回 &nbsp;INT_MAX (2<sup>31&nbsp;</sup>&minus; 1) 或&nbsp;INT_MIN (&minus;2<sup>31</sup>) 。</p>\n\n<p><strong>示例&nbsp;1:</strong></p>\n\n<pre><strong>输入:</strong> &quot;42&quot;\n<strong>输出:</strong> 42\n</pre>\n\n<p><strong>示例&nbsp;2:</strong></p>\n\n<pre><strong>输入:</strong> &quot;   -42&quot;\n<strong>输出:</strong> -42\n<strong>解释: </strong>第一个非空白字符为 &#39;-&#39;, 它是一个负号。\n&nbsp;    我们尽可能将负号与后面所有连续出现的数字组合起来，最后得到 -42 。\n</pre>\n\n<p><strong>示例&nbsp;3:</strong></p>\n\n<pre><strong>输入:</strong> &quot;4193 with words&quot;\n<strong>输出:</strong> 4193\n<strong>解释:</strong> 转换截止于数字 &#39;3&#39; ，因为它的下一个字符不为数字。\n</pre>\n\n<p><strong>示例&nbsp;4:</strong></p>\n\n<pre><strong>输入:</strong> &quot;words and 987&quot;\n<strong>输出:</strong> 0\n<strong>解释:</strong> 第一个非空字符是 &#39;w&#39;, 但它不是数字或正、负号。\n     因此无法执行有效的转换。</pre>\n\n<p><strong>示例&nbsp;5:</strong></p>\n\n<pre><strong>输入:</strong> &quot;-91283472332&quot;\n<strong>输出:</strong> -2147483648\n<strong>解释:</strong> 数字 &quot;-91283472332&quot; 超过 32 位有符号整数范围。 \n&nbsp;    因此返回 INT_MIN (&minus;2<sup>31</sup>) 。\n</pre>\n\n<p>&nbsp;</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",
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