mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
29 KiB
JSON
174 lines
29 KiB
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"title": "String to Integer (atoi)",
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"content": "<p>Implement the <code>myAtoi(string s)</code> function, which converts a string to a 32-bit signed integer.</p>\n\n<p>The algorithm for <code>myAtoi(string s)</code> is as follows:</p>\n\n<ol>\n\t<li><strong>Whitespace</strong>: Ignore any leading whitespace (<code>" "</code>).</li>\n\t<li><strong>Signedness</strong>: Determine the sign by checking if the next character is <code>'-'</code> or <code>'+'</code>, assuming positivity if neither present.</li>\n\t<li><strong>Conversion</strong>: Read the integer by skipping leading zeros until a non-digit character is encountered or the end of the string is reached. If no digits were read, then the result is 0.</li>\n\t<li><strong>Rounding</strong>: If the integer is out of the 32-bit signed integer range <code>[-2<sup>31</sup>, 2<sup>31</sup> - 1]</code>, then round the integer to remain in the range. Specifically, integers less than <code>-2<sup>31</sup></code> should be rounded to <code>-2<sup>31</sup></code>, and integers greater than <code>2<sup>31</sup> - 1</code> should be rounded to <code>2<sup>31</sup> - 1</code>.</li>\n</ol>\n\n<p>Return the integer as the final result.</p>\n\n<p> </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 = "42"</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">42</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<pre>\nThe underlined characters are what is read in and the caret is the current reader position.\nStep 1: "42" (no characters read because there is no leading whitespace)\n ^\nStep 2: "42" (no characters read because there is neither a '-' nor '+')\n ^\nStep 3: "<u>42</u>" ("42" is read in)\n ^\n</pre>\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 = " -042"</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">-42</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<pre>\nStep 1: "<u> </u>-042" (leading whitespace is read and ignored)\n ^\nStep 2: " <u>-</u>042" ('-' is read, so the result should be negative)\n ^\nStep 3: " -<u>042</u>" ("042" is read in, leading zeros ignored in the result)\n ^\n</pre>\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 = "1337c0d3"</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1337</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<pre>\nStep 1: "1337c0d3" (no characters read because there is no leading whitespace)\n ^\nStep 2: "1337c0d3" (no characters read because there is neither a '-' nor '+')\n ^\nStep 3: "<u>1337</u>c0d3" ("1337" is read in; reading stops because the next character is a non-digit)\n ^\n</pre>\n</div>\n\n<p><strong class=\"example\">Example 4:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = "0-1"</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<pre>\nStep 1: "0-1" (no characters read because there is no leading whitespace)\n ^\nStep 2: "0-1" (no characters read because there is neither a '-' nor '+')\n ^\nStep 3: "<u>0</u>-1" ("0" is read in; reading stops because the next character is a non-digit)\n ^\n</pre>\n</div>\n\n<p><strong class=\"example\">Example 5:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = "words and 987"</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Reading stops at the first non-digit character 'w'.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 <= s.length <= 200</code></li>\n\t<li><code>s</code> consists of English letters (lower-case and upper-case), digits (<code>0-9</code>), <code>' '</code>, <code>'+'</code>, <code>'-'</code>, and <code>'.'</code>.</li>\n</ul>\n",
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"translatedTitle": "字符串转换整数 (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。</p>\n\n<p>函数 <code>myAtoi(string s)</code> 的算法如下：</p>\n\n<ol>\n\t<li><strong>空格：</strong>读入字符串并丢弃无用的前导空格（<code>\" \"</code>）</li>\n\t<li><strong>符号：</strong>检查下一个字符（假设还未到字符末尾）为 <code>'-'</code> 还是 <code>'+'</code>。如果两者都不存在，则假定结果为正。</li>\n\t<li><strong>转换：</strong>通过跳过前置零来读取该整数，直到遇到非数字字符或到达字符串的结尾。如果没有读取数字，则结果为0。</li>\n\t<li><b>舍入：</b>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> 的整数应该被舍入为 <code>−2<sup>31</sup></code> ，大于 <code>2<sup>31 </sup>− 1</code> 的整数应该被舍入为 <code>2<sup>31 </sup>− 1</code> 。</li>\n</ol>\n\n<p>返回整数作为最终结果。</p>\n\n<p> </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 = \"42\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">42</span></p>\n\n<p><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。</p>\n\n<pre>\n带下划线线的字符是所读的内容，插入符号是当前读入位置。\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</pre>\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 = \" -042\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">-42</span></p>\n\n<p><strong>解释：</strong></p>\n\n<pre>\n第 1 步：\"<u><strong> </strong></u>-042\"（读入前导空格，但忽视掉）\n ^\n第 2 步：\" <u>-</u>042\"（读入 '-' 字符，所以结果应该是负数）\n ^\n第 3 步：\" <u>-042</u>\"（读入 \"042\"，在结果中忽略前导零）\n ^\n</pre>\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>1337c0d3<span class=\"example-io\">\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">1337</span></p>\n\n<p><strong>解释：</strong></p>\n\n<pre>\n第 1 步：\"1337c0d3\"（当前没有读入字符，因为没有前导空格）\n ^\n第 2 步：\"1337c0d3\"（当前没有读入字符，因为这里不存在 '-' 或者 '+'）\n ^\n第 3 步：\"1337c0d3\"（读入 \"1337\"；由于下一个字符不是一个数字，所以读入停止）\n ^\n</pre>\n</div>\n\n<p><strong class=\"example\">示例 4：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \"0-1\"</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>0</span></p>\n\n<p><strong>解释：</strong></p>\n\n<pre>\n第 1 步：\"0-1\" (当前没有读入字符，因为没有前导空格)\n ^\n第 2 步：\"0-1\" (当前没有读入字符，因为这里不存在 '-' 或者 '+')\n ^\n第 3 步：\"<u>0</u>-1\" (读入 \"0\"；由于下一个字符不是一个数字，所以读入停止)\n ^\n</pre>\n</div>\n\n<p><strong class=\"example\">示例 5：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \"words and 987\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">0</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>读取在第一个非数字字符“w”处停止。</p>\n</div>\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",
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