牛客网做算法题时go语言读取标准输入的方法
发布时间：2021-12-23 编辑：jiaochengji.com
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最近由于面试需要使用牛客网的 OJ 系统，感觉特别不习惯。之前都是在 leetcode 上做算法题，所以对需要自己处理输入输出的方式特别不熟悉，捣鼓了好一小会。这里做一个小记录，也是一个分享吧。
算法题demo：a b
<pre><code>每行包含两个整数a和b 对于每行输入对应输出一行a和b的和 输入 1 5 输出 6 </code></pre> <h2>方法一：使用fmt.Scan按空格读取</h2>fmt.Scan 只识别空格，同时会将换行判断为空格，做法如下（牛客官网示例）
<pre><code class="lang-go hljs"><span class="token keyword">package</span> main <span class="token keyword">import</span> <span class="token punctuation">(</span> <span class="token string">"fmt"</span> <span class="token string">"io"</span> <span class="token punctuation">)</span> <span class="token keyword">func</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">var</span> a<span class="token punctuation">,</span> b <span class="token builtin">int</span> <span class="token keyword">for</span> <span class="token punctuation">{</span> <span class="token boolean">_</span><span class="token punctuation">,</span> err <span class="token operator">:=</span> fmt<span class="token punctuation">.</span><span class="token function">Scan</span><span class="token punctuation">(</span><span class="token operator">&</span>a<span class="token punctuation">,</span> <span class="token operator">&</span>b<span class="token punctuation">)</span> <span class="token keyword">if</span> err <span class="token operator">==</span> io<span class="token punctuation">.</span>EOF <span class="token punctuation">{</span> <span class="token keyword">break</span> <span class="token punctuation">}</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a <span class="token operator"> </span> b<span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <h2>方法二：使用bufio.NewScanner(os.Stdin)按行读取</h2>对于有的算法题，使用 fmt.Scan 按空格读取是无法处理输入数据的。比方说输入为 “a s d f-q w e r”，"-" 的左右部分内容是一组输入，这需要我们去掉"-"。这时我们就可以使用 bufio.NewScanner(os.Stdin) 按行读取。还是以 ‘a b’ 举例，如下：
<pre><code class="lang-go hljs"><span class="token keyword">package</span> main <span class="token keyword">import</span> <span class="token punctuation">(</span> <span class="token string">"bufio"</span> <span class="token string">"fmt"</span> <span class="token string">"os"</span> <span class="token string">"strconv"</span> <span class="token string">"strings"</span> <span class="token punctuation">)</span> <span class="token keyword">func</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">var</span> a<span class="token punctuation">,</span> b <span class="token builtin">int</span> input <span class="token operator">:=</span> bufio<span class="token punctuation">.</span><span class="token function">NewScanner</span><span class="token punctuation">(</span>os<span class="token punctuation">.</span>Stdin<span class="token punctuation">)</span> <span class="token keyword">for</span> input<span class="token punctuation">.</span><span class="token function">Scan</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> a<span class="token punctuation">,</span> <span class="token boolean">_</span> <span class="token operator">=</span> strconv<span class="token punctuation">.</span><span class="token function">Atoi</span><span class="token punctuation">(</span>strings<span class="token punctuation">.</span><span class="token function">Split</span><span class="token punctuation">(</span>input<span class="token punctuation">.</span><span class="token function">Text</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">" "</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span> b<span class="token punctuation">,</span> <span class="token boolean">_</span> <span class="token operator">=</span> strconv<span class="token punctuation">.</span><span class="token function">Atoi</span><span class="token punctuation">(</span>strings<span class="token punctuation">.</span><span class="token function">Split</span><span class="token punctuation">(</span>input<span class="token punctuation">.</span><span class="token function">Text</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">" "</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a<span class="token operator"> </span>b<span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> 到此这篇关于“牛客网做算法题时go语言读取标准输入的方法”的文章就介绍到这了,更多文章或继续浏览下面的相关文章，希望大家以后多多支持JQ教程网！您可能感兴趣的文章：
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