10 lines
6.2 KiB
HTML
10 lines
6.2 KiB
HTML
<!DOCTYPE html><html lang="zh-CN"><head><meta charset="utf-8"><meta name="X-UA-Compatible" content="IE=edge"><title> leetcode-string-to-integer-atoi · MarkDown</title><meta name="description" content="leetcode-string-to-integer-atoi - Ching"><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="short icon" href="/favicon.png"><link rel="stylesheet" href="/css/apollo.css"><link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,600" type="text/css"><meta name="generator" content="Hexo 6.0.0"><link rel="alternate" href="/atom.xml" title="MarkDown" type="application/atom+xml">
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</head><body><header><a href="/" class="logo-link"><img src="/logo.png"></a><ul class="nav nav-list"><li class="nav-list-item"><a href="/" target="_self" class="nav-list-link">ALL</a></li><li class="nav-list-item"><a href="/categories/leetcode/" target="_self" class="nav-list-link">LEETCODE</a></li><li class="nav-list-item"><a href="/atom.xml" target="_self" class="nav-list-link">RSS</a></li></ul></header><section class="container"><div class="post"><article class="post-block"><h1 class="post-title">leetcode-string-to-integer-atoi</h1><div class="post-meta"><div class="post-time">2020年4月16日</div></div><div class="post-content"><h3 id="8-字符串转换整数-atoi"><a href="#8-字符串转换整数-atoi" class="headerlink" title="8. 字符串转换整数 (atoi)"></a>8. 字符串转换整数 (atoi)</h3><p><a target="_blank" rel="noopener" href="https://leetcode-cn.com/problems/string-to-integer-atoi/">题目</a></p>
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<p>没什么好说的，注意各种情况，识别到数字之后就一直要是数字。</p>
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<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span>:</span></span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">myAtoi</span>(<span class="params">self, <span class="built_in">str</span>: <span class="built_in">str</span></span>) -> <span class="built_in">int</span>:</span></span><br><span class="line"> p = <span class="string">''</span></span><br><span class="line"> <span class="built_in">str</span> = <span class="built_in">str</span>.lstrip()</span><br><span class="line"> n = <span class="string">''</span></span><br><span class="line"> min_int = -<span class="number">2</span>**<span class="number">31</span></span><br><span class="line"> max_int = <span class="number">2</span>**<span class="number">31</span>-<span class="number">1</span></span><br><span class="line"> isnumeric = <span class="literal">False</span></span><br><span class="line"> <span class="keyword">for</span> x <span class="keyword">in</span> <span class="built_in">str</span>:</span><br><span class="line"> <span class="keyword">if</span> <span class="keyword">not</span> isnumeric <span class="keyword">and</span> x == <span class="string">'-'</span>:</span><br><span class="line"> p = <span class="string">'-'</span></span><br><span class="line"> isnumeric = <span class="literal">True</span></span><br><span class="line"> <span class="keyword">continue</span></span><br><span class="line"> <span class="keyword">if</span> <span class="keyword">not</span> isnumeric <span class="keyword">and</span> x == <span class="string">'+'</span>:</span><br><span class="line"> isnumeric = <span class="literal">True</span></span><br><span class="line"> <span class="keyword">continue</span></span><br><span class="line"> <span class="keyword">if</span> x.isnumeric():</span><br><span class="line"> n += x</span><br><span class="line"> isnumeric = <span class="literal">True</span></span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> <span class="keyword">if</span> <span class="keyword">not</span> n:</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span></span><br><span class="line"> <span class="keyword">if</span> <span class="built_in">int</span>(n) > max_int:</span><br><span class="line"> <span class="keyword">if</span> p:</span><br><span class="line"> <span class="keyword">return</span> min_int</span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> <span class="keyword">return</span> max_int</span><br><span class="line"> p += n</span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">int</span>(p)</span><br><span class="line"><span class="comment"># 32 ms 13.6 MB</span></span><br></pre></td></tr></table></figure>
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