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<a class="article-title" href="/2017/12/31/2017summary/">2017 Summary</a>
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<a href="/2017/12/31/2017summary/" class="archive-article-date">
<time datetime="2017-12-31T15:36:01.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-12-31</time>
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<p>时间像流水一样哗哗哗就过去了，受大佬们的启发，以文字祭奠逝去的2017年，留不住岁月，那就纪念它吧！</p>
<h3 id="学习工作"><a class="header-anchor" href="#学习工作">¶</a>学习工作</h3>
<p>2017最大的收获就是来自导师的打击，果然我还是“逆境成才”型选手，虽然高压持续了很久，身心稍微受损，但不得不承认，比起研一松懈的状态，研二这半学年进步了太多，最明显的就是上升几个武力值的互联网时代关键技能之搜索能力。</p>
<p>技术：学了ios开发基础，由于科研紧迫，不得不放弃参与“保单宝”的开发，论文投完以后放松了一周多，归咎于本性的懒惰没有再继续coding<img class="emoji" draggable="false" alt="😭" src="https://twemoji.maxcdn.com/2/72x72/1f62d.png"> ，错失一次上线产品锻炼机会，在这里做出深切的自我diss。计划中每天两道leetcode也断断续续没有一直坚持，希望2018年科研之余能够认真提高技术，面向工作，刷算法，练框架。（点赞赵同学在保证科研输出的同时参与两个工程项目，佩服佩服<img class="emoji" draggable="false" alt="👍" src="https://twemoji.maxcdn.com/2/72x72/1f44d.png"> )</p>
<p>科研：由于能力欠缺，ICDCS的投稿烂得一坨<img class="emoji" draggable="false" alt="💩" src="https://twemoji.maxcdn.com/2/72x72/1f4a9.png"> ，不过还是抱有中short paper的幻想；目前在着手第二篇论文，计划投2月底的ICPP或IWQoS，年关附近，2018的新年必将不轻松了<img class="emoji" draggable="false" alt="😟" src="https://twemoji.maxcdn.com/2/72x72/1f61f.png"> 。据说这两个会议录取率可观，加油好好搞，希望能如愿在暑假前中一篇B类，顺利实习。由于学术界和工业界无法跨越的鸿沟，现在研究的东西只是提高综合能力，对技术主导类的工作没有帮助，尽管这样，还是要把每件事都做踏实，向优秀的战友们学习。</p>
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<p>array</p>
<p>声明：</p>
<p>var arr = [1,2,3]</p>
<p>var arr = [Int](repeating: 0, count:3) //[0,0,0]</p>
<p>var arr:[Int]; arr = [] //空数组1</p>
<p>var arr:[Int] = [] //空数组2</p>
<p>var arr = [Int]() //空数组3</p>
<p>var arr = Array<Int>() //空数组4</p>
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<p>Optional Type</p>
<p>Int? 等价于 Optional<Int></p>
<p>Int? 类型的变量 oVar 表示 oVar 要嘛包含Int类型的数据，要嘛为nil —— 非Optional Type的变量不能赋值为nil；也就是说，Optional类型允许变量没有值，其它类型如果没有初始化值在使用时会报错 —— 比如通过下标访问数组元素时返回Optional类型，越界时可以返回nil;</p>
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<a class="article-title" href="/2017/10/06/Happy-Valley-in-sh/">Happy Valley in sh</a>
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<time datetime="2017-10-06T14:11:38.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-10-06</time>
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<p>偷偷回忆了一下寄几的峥嵘岁月：12年国庆南京，全城跑，难忘的年岁，很傻很开心；13年国庆青岛，蹭了好朋友的车，小资旅游初体验；14年国庆北京，还记得南锣鼓巷涌动的人头艰难的步伐…然而年轻的我们并不介意拥挤；15年国庆江浙沪，上海深度游+千岛湖+新叶古村+…；16年国庆回乡游，17年国庆室内游<img class="emoji" draggable="false" alt="😄" src="https://twemoji.maxcdn.com/2/72x72/1f604.png">，好吧都是因为今年投资太狂，经历了一场大封杀，凉了，嗯然而还是要对得起祖国母亲的生日，哦尅一日游走起！连绵大雨后第一个晴天，早起奔向欢乐谷，too young too naive的以为一天能刷完，项目太多人太多，计划流产，总之欢乐谷六个区一天绝对不够用，年卡有存在的道理，三次可以回本。敲黑板，4大过山车必玩，趁着年轻你懂的。</p>
<p><strong>欢乐时光：谷木游龙–天地双雄–摇摆伞</strong></p>
<p>谷木第一个坡吓到我了，全程闭眼不敢叫，一上来就这么刺激QAQ，天地双雄虽然很高，仿佛不那么可怕，摇摆伞就小儿科了。</p>
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<p><strong><a href="http://www.mzone.cc/article/619.html" target="_blank" rel="external">mklink</a> /J dir3 dir1</strong>：创建dir3到dir1的软链接</p>
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<p><strong>string</strong>：</p>
<p>string=“runoob”</p>
<p>print(string[2:5])输出<em>noo</em>而不是<em>noob</em>，也就是说只取到下标5之前</p>
<p><strong>list</strong>：</p>
<p>a = [1, 2, 3, 4, 5, 6]</p>
<p>print(a[2:5])输出[3,4,5]，也是只取到下标5之前</p>
<p><strong>tuple</strong>：</p>
<p>与list类似，不同之处在于元组的元素不能修改，元组写在小括号**()**里</p>
<p><strong>set</strong>：</p>
<p>使用大括号 { } 或者 set() 函数创建集合，创建一个空集合必须用 set() 而不是 { }， { } 是用来创建一个空字典</p>
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<p><a href="http://www.cnblogs.com/linjiqin/p/3556497.html" target="_blank" rel="external">CSS padding margin border属性详解</a></p>
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<a class="article-title" href="/2017/08/30/Hexo+Github搭建个人博客/">Hexo+Github开坑记</a>
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<p>Please check <a href="https://hexo.io/docs/" target="_blank" rel="external">Hexo</a> for more info.</p>
<p><a href="http://1.xn--Githubirrun-2o0r039n.github.io" target="_blank" rel="external">1.Github建仓irrun.github.io</a></p>
<p>2.安装nodejs</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">npm install hexo -g</div><div class="line">hexo version <span class="comment">#查看Hexo的版本</span></div><div class="line">hexo init myblog</div><div class="line"><span class="built_in">cd</span> myblog</div><div class="line">npm install</div></pre></td></tr></table></figure>
<p>修改 _config.yml 建立关联</p>
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<p>1./home/lvtest/test/test.py</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">from datetime import datetime</div><div class="line">now=datetime.now()</div><div class="line">f=open(<span class="string">'test.log'</span>,<span class="string">'a'</span>)</div><div class="line">f.write(<span class="string">'%s '</span>%now)</div><div class="line">f.close()</div></pre></td></tr></table></figure>
<p>2.edit /etc/rc.local with adding codes below:</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line"><span class="built_in">cd</span> /home/lvtest/<span class="built_in">test</span></div><div class="line">su lvtest -c <span class="string">"python /home/lvtest/test/test.py"</span></div><div class="line"><span class="built_in">exit</span> 0 <span class="comment"># ? if it is necessary</span></div></pre></td></tr></table></figure>
<p>3.Make your /etc/rc.local executable in case it is not already executable by</p>
<p>sudo chown root /etc/rc.local<br>
sudo chmod 755 /etc/rc.local</p>
<p>4.Check everything works fine by executing</p>
<p>sudo /etc/rc.local start</p>
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<p>题目示例： “abcdefgh” 循环右移3位得到 “defghabc”</p>
<p>解法一：消耗额外的3个空间，空间复杂度为O(n)，当程序运行的空间比较苛刻的时候，不可取。时间复杂度为O(n)</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line">int <span class="function"><span class="title">main</span></span>(){</div><div class="line"> char <span class="built_in">source</span>[]=<span class="string">"abcdefg"</span>;</div><div class="line"> char *temp=new char[3];</div><div class="line"> int i;</div><div class="line"> <span class="keyword">for</span>(i=0;i<3;i++)temp[i]=<span class="built_in">source</span>[i];</div><div class="line"> <span class="keyword">for</span>(i=0;i<(strlen(<span class="built_in">source</span>)-3);i++)<span class="built_in">source</span>[i]=<span class="built_in">source</span>[i+3];</div><div class="line"> <span class="keyword">for</span>(i=0;i<3;i++)<span class="built_in">source</span>[strlen(<span class="built_in">source</span>)-3+i]=temp[i];</div><div class="line"> cout<<<span class="built_in">source</span><<endl;</div><div class="line">}</div></pre></td></tr></table></figure>
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<p>一、笔试</p>
<p>百度文库（趋势科技2015校园招聘笔试题）有很多原题，考的范围很广，计算机网络：协议，c++：继承、字节对齐、二维数组等等，总体一般，不深不浅。贴几道印象深的题：</p>
<p>1.多态类中的虚函数表是Compile-Time，还是Run-Time时建立的?<br>
答案：虚拟函数表是在编译期就建立了,各个虚拟函数这时被组织成了一个虚拟函数的入口地址的数组.而对象的隐藏成员–虚拟函数表指针是在运行期–也就是构造函数被调用时进行初始化的,这是实现多态的关键.</p>
<p>2.一个父类写了一个virtual 函数，如果子类覆盖它的函数不加virtual ,也能实现多态? 在子类的空间里，有没有父类的这个函数，或者父类的私有变量?<br>
答案：只要基类在定义成员函数时已经声明了virtual关键字，在派生类实现的时候覆盖该函数时，virtual关键字可加可不加，不影响多态的实现。子类的空间里有父类的所有变量(static除外)。</p>
<p>3.构造函数可以为虚函数吗？<br>
不能，构造函数是在对象完全构造之前运行的，在构造函数运行的时候，对象的动态类型还不完整。</p>
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