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add-two-number
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<time title="Created: 2015-04-14 17:40:10" itemprop="dateCreated datePublished" datetime="2015-04-14T17:40:10+08:00">2015-04-14</time>
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<time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
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<h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.</p>
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<p><strong>Input</strong>:<code>(2 -> 4 -> 3) + (5 -> 6 -> 4)</code><br><strong>Output</strong>: <code>7 -> 0 -> 8</code></p>
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<p><strong>分析（不用英文装逼了）</strong><br>这个代码是抄来的，<a href="https://github.com/haoel/leetcode" target="_blank" rel="noopener">链接</a>原作是这位大大。</p>
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<a id="more"></a>
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<p>一开始没看懂题，后来发现是要进位的，自己写的时候想把长短不同时长的串接到结果<br>串的后面，试了下因为进位会有些问题比较难搞定，这样的话就是在其中一个为空的<br>时候还是会循环操作，在链表太大的时候可能会有问题，就这样（逃<br>原来是有个小错误没发现，改进后的代码也AC了，棒棒哒！</p>
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<h3 id="正确代码"><a href="#正确代码" class="headerlink" title="正确代码"></a>正确代码</h3><figure class="highlight c++"><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><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Definition for singly-linked list.</span></span><br><span class="line"><span class="comment"> * struct ListNode {</span></span><br><span class="line"><span class="comment"> * int val;</span></span><br><span class="line"><span class="comment"> * ListNode *next;</span></span><br><span class="line"><span class="comment"> * ListNode(int x) : val(x), next(NULL) {}</span></span><br><span class="line"><span class="comment"> * };</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> {</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line"> <span class="function">ListNode *<span class="title">addTwoNumbers</span><span class="params">(ListNode *l1, ListNode *l2)</span> </span>{</span><br><span class="line"> <span class="function">ListNode <span class="title">dummy</span><span class="params">(<span class="number">0</span>)</span></span>;</span><br><span class="line"> ListNode* p = &dummy;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">int</span> cn = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">while</span>(l1 || l2){</span><br><span class="line"> <span class="keyword">int</span> val = cn + (l1 ? l1->val : <span class="number">0</span>) + (l2 ? l2->val : <span class="number">0</span>);</span><br><span class="line"> cn = val / <span class="number">10</span>;</span><br><span class="line"> val = val % <span class="number">10</span>;</span><br><span class="line"> p->next = <span class="keyword">new</span> ListNode(val);</span><br><span class="line"> p = p->next;</span><br><span class="line"> <span class="keyword">if</span>(l1){</span><br><span class="line"> l1 = l1->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(l2){</span><br><span class="line"> l2 = l2->next;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(cn != <span class="number">0</span>){</span><br><span class="line"> p->next = <span class="keyword">new</span> ListNode(cn);</span><br><span class="line"> p = p->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> dummy.next;</span><br><span class="line"> }</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
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<h3 id="失败的代码"><a href="#失败的代码" class="headerlink" title="失败的代码"></a>失败的代码</h3><figure class="highlight c++"><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><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Definition for singly-linked list.</span></span><br><span class="line"><span class="comment"> * struct ListNode {</span></span><br><span class="line"><span class="comment"> * int val;</span></span><br><span class="line"><span class="comment"> * ListNode *next;</span></span><br><span class="line"><span class="comment"> * ListNode(int x) : val(x), next(NULL) {}</span></span><br><span class="line"><span class="comment"> * };</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> {</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line"> <span class="function">ListNode *<span class="title">addTwoNumbers</span><span class="params">(ListNode *l1, ListNode *l2)</span> </span>{</span><br><span class="line"> <span class="function">ListNode <span class="title">dummy</span><span class="params">(<span class="number">0</span>)</span></span>;</span><br><span class="line"> ListNode* p = &dummy;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">int</span> cn = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> flag = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">while</span>(l1 || l2){</span><br><span class="line"> <span class="keyword">int</span> val = cn + (l1 ? l1->val : <span class="number">0</span>) + (l2 ? l2->val : <span class="number">0</span>);</span><br><span class="line"> cn = val / <span class="number">10</span>;</span><br><span class="line"> val = val % <span class="number">10</span>;</span><br><span class="line"> p->next = <span class="keyword">new</span> ListNode(val);</span><br><span class="line"> p = p->next;</span><br><span class="line"> <span class="keyword">if</span>(!l1 && cn == <span class="number">0</span>){</span><br><span class="line"> flag = <span class="number">1</span>;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(!l2 && cn == <span class="number">0</span>){</span><br><span class="line"> flag = <span class="number">1</span>;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(l1){</span><br><span class="line"> l1 = l1->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(l2){</span><br><span class="line"> l2 = l2->next;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(!l1 && cn == <span class="number">0</span> && flag == <span class="number">1</span>){</span><br><span class="line"> p->next = l2->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(!l2 && cn == <span class="number">0</span> && flag == <span class="number">1</span>){</span><br><span class="line"> p->next = l1->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(cn != <span class="number">0</span>){</span><br><span class="line"> p->next = <span class="keyword">new</span> ListNode(cn);</span><br><span class="line"> p = p->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> dummy.next;</span><br><span class="line"> }</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
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let { app_id, app_key, server_url } = {"enable":true,"app_id":"ysza182Vghlqjdt7QiwGLLJy-gzGzoHsz","app_key":"s9GDqbn7gnGGkusf66YRVccw","server_url":"https://leancloud.cn","security":true};
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headers: {
|
|
'X-LC-Id' : app_id,
|
|
'X-LC-Key' : app_key,
|
|
'Content-Type': 'application/json',
|
|
},
|
|
body: JSON.stringify(data)
|
|
});
|
|
};
|
|
if (CONFIG.page.isPost) {
|
|
if (CONFIG.hostname !== location.hostname) return;
|
|
addCount(Counter);
|
|
} else if (document.querySelectorAll('.post-title-link').length >= 1) {
|
|
showTime(Counter);
|
|
}
|
|
}
|
|
|
|
let api_server = app_id.slice(-9) !== '-MdYXbMMI' ? server_url : `https://${app_id.slice(0, 8).toLowerCase()}.api.lncldglobal.com`;
|
|
|
|
if (api_server) {
|
|
fetchData(api_server);
|
|
} else {
|
|
fetch('https://app-router.leancloud.cn/2/route?appId=' + app_id)
|
|
.then(response => response.json())
|
|
.then(({ api_server }) => {
|
|
fetchData('https://' + api_server);
|
|
});
|
|
}
|
|
})();
|
|
</script>
|
|
|
|
|
|
</div>
|
|
</footer>
|
|
</div>
|
|
|
|
|
|
<script src="/lib/anime.min.js"></script>
|
|
<script src="//cdn.jsdelivr.net/npm/jquery@3/dist/jquery.min.js"></script>
|
|
<script src="//cdn.jsdelivr.net/gh/fancyapps/fancybox@3/dist/jquery.fancybox.min.js"></script>
|
|
<script src="//cdn.jsdelivr.net/npm/lozad@1/dist/lozad.min.js"></script>
|
|
<script src="/lib/velocity/velocity.min.js"></script>
|
|
<script src="/lib/velocity/velocity.ui.min.js"></script>
|
|
|
|
<script src="/js/utils.js"></script>
|
|
|
|
<script src="/js/motion.js"></script>
|
|
|
|
|
|
<script src="/js/schemes/pisces.js"></script>
|
|
|
|
|
|
<script src="/js/next-boot.js"></script>
|
|
|
|
|
|
|
|
|
|
|
|
<script>
|
|
(function(){
|
|
var canonicalURL, curProtocol;
|
|
//Get the <link> tag
|
|
var x=document.getElementsByTagName("link");
|
|
//Find the last canonical URL
|
|
if(x.length > 0){
|
|
for (i=0;i<x.length;i++){
|
|
if(x[i].rel.toLowerCase() == 'canonical' && x[i].href){
|
|
canonicalURL=x[i].href;
|
|
}
|
|
}
|
|
}
|
|
//Get protocol
|
|
if (!canonicalURL){
|
|
curProtocol = window.location.protocol.split(':')[0];
|
|
}
|
|
else{
|
|
curProtocol = canonicalURL.split(':')[0];
|
|
}
|
|
//Get current URL if the canonical URL does not exist
|
|
if (!canonicalURL) canonicalURL = window.location.href;
|
|
//Assign script content. Replace current URL with the canonical URL
|
|
!function(){var e=/([http|https]:\/\/[a-zA-Z0-9\_\.]+\.baidu\.com)/gi,r=canonicalURL,t=document.referrer;if(!e.test(r)){var n=(String(curProtocol).toLowerCase() === 'https')?"https://sp0.baidu.com/9_Q4simg2RQJ8t7jm9iCKT-xh_/s.gif":"//api.share.baidu.com/s.gif";t?(n+="?r="+encodeURIComponent(document.referrer),r&&(n+="&l="+r)):r&&(n+="?l="+r);var i=new Image;i.src=n}}(window);})();
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<script src="//cdn.jsdelivr.net/npm/quicklink@1/dist/quicklink.umd.js"></script>
|
|
<script>
|
|
window.addEventListener('load', () => {
|
|
quicklink({
|
|
timeout : 3000,
|
|
priority: true,
|
|
ignores : [uri => uri.includes('#'),uri => uri === 'https://nicksxs.me/2015/04/14/Add-Two-Number/',]
|
|
});
|
|
});
|
|
</script>
|
|
|
|
<script>
|
|
function loadCount() {
|
|
var d = document, s = d.createElement('script');
|
|
s.src = 'https://nicksxs.disqus.com/count.js';
|
|
s.id = 'dsq-count-scr';
|
|
(d.head || d.body).appendChild(s);
|
|
}
|
|
// defer loading until the whole page loading is completed
|
|
window.addEventListener('load', loadCount, false);
|
|
</script>
|
|
<script>
|
|
var disqus_config = function() {
|
|
this.page.url = "https://nicksxs.me/2015/04/14/Add-Two-Number/";
|
|
this.page.identifier = "2015/04/14/Add-Two-Number/";
|
|
this.page.title = "add-two-number";
|
|
};
|
|
NexT.utils.loadComments(document.querySelector('#disqus_thread'), () => {
|
|
if (window.DISQUS) {
|
|
DISQUS.reset({
|
|
reload: true,
|
|
config: disqus_config
|
|
});
|
|
} else {
|
|
var d = document, s = d.createElement('script');
|
|
s.src = 'https://nicksxs.disqus.com/embed.js';
|
|
s.setAttribute('data-timestamp', '' + +new Date());
|
|
(d.head || d.body).appendChild(s);
|
|
}
|
|
});
|
|
</script>
|
|
|
|
</body>
|
|
</html>
|