-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathindex.html
More file actions
358 lines (219 loc) · 18.5 KB
/
index.html
File metadata and controls
358 lines (219 loc) · 18.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CuzWeAre's Blog</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta property="og:type" content="website">
<meta property="og:title" content="CuzWeAre's Blog">
<meta property="og:url" content="https://cuzweare.github.io/index.html">
<meta property="og:site_name" content="CuzWeAre's Blog">
<meta property="og:locale" content="zh_CN">
<meta property="article:author" content="CuzWeAre">
<meta name="twitter:card" content="summary">
<link rel="alternate" href="/atom.xml" title="CuzWeAre's Blog" type="application/atom+xml">
<link rel="shortcut icon" href="/favicon.png">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/index.min.css">
<link rel="stylesheet" href="/css/style.css">
<link rel="stylesheet" href="/fancybox/jquery.fancybox.min.css">
<meta name="generator" content="Hexo 6.3.0"></head>
<body>
<div id="container">
<div id="wrap">
<header id="header">
<div id="banner"></div>
<div id="header-outer" class="outer">
<div id="header-title" class="inner">
<h1 id="logo-wrap">
<a href="/" id="logo">CuzWeAre's Blog</a>
</h1>
</div>
<div id="header-inner" class="inner">
<nav id="main-nav">
<a id="main-nav-toggle" class="nav-icon"><span class="fa fa-bars"></span></a>
<a class="main-nav-link" href="/">Home</a>
<a class="main-nav-link" href="/archives">Archives</a>
</nav>
<nav id="sub-nav">
<a class="nav-icon" href="/atom.xml" title="RSS 订阅"><span class="fa fa-rss"></span></a>
<a class="nav-icon nav-search-btn" title="搜索"><span class="fa fa-search"></span></a>
</nav>
<div id="search-form-wrap">
<form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form"><input type="search" name="q" class="search-form-input" placeholder="搜索"><button type="submit" class="search-form-submit"></button><input type="hidden" name="sitesearch" value="https://CuzWeAre.github.io"></form>
</div>
</div>
</div>
</header>
<div class="outer">
<section id="main">
<article id="post-动态规划——简单的密码" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2023/09/27/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92%E2%80%94%E2%80%94%E7%AE%80%E5%8D%95%E7%9A%84%E5%AF%86%E7%A0%81/" class="article-date">
<time class="dt-published" datetime="2023-09-27T14:15:25.000Z" itemprop="datePublished">2023-09-27</time>
</a>
<div class="article-category">
<a class="article-category-link" href="/categories/%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/">学习笔记</a>
</div>
</div>
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2023/09/27/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92%E2%80%94%E2%80%94%E7%AE%80%E5%8D%95%E7%9A%84%E5%AF%86%E7%A0%81/">动态规划——简单的密码</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<blockquote>
<p>今天实验课上了强度，抓耳挠腮，无不惊叹敬爱的老师下手之厉害。细细思量，请教百度谷歌之先贤，终得解出此题，大呼过瘾 </p>
</blockquote>
<p><img src="/../imgs/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92%E9%97%AE%E9%A2%98--%E7%AE%80%E5%8D%95%E7%9A%84%E5%AF%86%E7%A0%81.png" alt="简单的密码"></p>
<h2 id="思路"><a href="#思路" class="headerlink" title="思路"></a>思路</h2><blockquote>
<p>把一个大问题拆分为几个小问题。 </p>
</blockquote>
<p>对于位数大于5位的密码，有如下表格关系。<br>pwd(n)是个伪函数，用来表示n位密码的可能值。</p>
<table>
<thead>
<tr>
<th>密码前导</th>
<th align="center">剩余部分</th>
</tr>
</thead>
<tbody><tr>
<td>000</td>
<td align="center">pow(2,n-3)</td>
</tr>
<tr>
<td>001</td>
<td align="center">pwd(n-3)</td>
</tr>
<tr>
<td>01</td>
<td align="center">pwd(n-2)</td>
</tr>
<tr>
<td>1</td>
<td align="center">pwd(n-1)</td>
</tr>
</tbody></table>
<figure class="highlight cpp"><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></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string"><iostream></span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string"><cmath></span></span></span><br><span class="line"><span class="function"><span class="type">int</span> <span class="title">fun</span><span class="params">(<span class="type">int</span> n)</span></span>;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="type">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="type">int</span> n;</span><br><span class="line"> <span class="keyword">while</span> (<span class="number">1</span>)</span><br><span class="line"> {</span><br><span class="line"> std::cin >> n;</span><br><span class="line"> std::cout << <span class="built_in">fun</span>(n) << std::endl;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="type">int</span> <span class="title">fun</span><span class="params">(<span class="type">int</span> n)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">if</span> (n < <span class="number">3</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> (n == <span class="number">3</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">return</span> <span class="number">1</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> (n == <span class="number">4</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">return</span> <span class="number">3</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> (n == <span class="number">5</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">return</span> <span class="number">8</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> (n == <span class="number">6</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">return</span> <span class="number">20</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">fun</span>(n - <span class="number">1</span>) + <span class="built_in">fun</span>(n - <span class="number">2</span>) + <span class="built_in">fun</span>(n - <span class="number">3</span>) + <span class="built_in">pow</span>(<span class="number">2</span>, n - <span class="number">3</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<blockquote>
<p>下面是Python实现的另一种方法</p>
</blockquote>
<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></pre></td><td class="code"><pre><span class="line">result=[<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">1</span>,<span class="number">3</span>,<span class="number">8</span>,<span class="number">20</span>]</span><br><span class="line"><span class="keyword">for</span> i <span class="keyword">in</span> <span class="built_in">range</span>(<span class="number">7</span>,<span class="number">31</span>):</span><br><span class="line"> count=<span class="number">0</span></span><br><span class="line"> count+=<span class="number">2</span>**(i-<span class="number">3</span>)+<span class="number">2</span>**(i-<span class="number">4</span>)+<span class="number">2</span>**(i-<span class="number">5</span>)*<span class="number">2</span>+<span class="number">2</span>**(i-<span class="number">6</span>)*<span class="number">4</span></span><br><span class="line"> <span class="keyword">for</span> n <span class="keyword">in</span> <span class="built_in">range</span>(<span class="number">4</span>,i-<span class="number">2</span>):</span><br><span class="line"> count+=<span class="number">2</span>**(i-n-<span class="number">3</span>)*(<span class="number">2</span>**(n-<span class="number">1</span>)-result[n-<span class="number">1</span>])</span><br><span class="line"> result.append(count)</span><br><span class="line"> <span class="built_in">print</span>(<span class="string">f'<span class="subst">{i}</span>:<span class="subst">{count}</span>'</span>)</span><br></pre></td></tr></table></figure>
</div>
<footer class="article-footer">
<a data-url="https://cuzweare.github.io/2023/09/27/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92%E2%80%94%E2%80%94%E7%AE%80%E5%8D%95%E7%9A%84%E5%AF%86%E7%A0%81/" data-id="cln1yjtqq0001ropedifvh9sg" data-title="动态规划——简单的密码" class="article-share-link"><span class="fa fa-share">分享</span></a>
<ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/C/" rel="tag">C++</a></li><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92/" rel="tag">动态规划</a></li></ul>
</footer>
</div>
</article>
<article id="post-test" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2023/09/27/test/" class="article-date">
<time class="dt-published" datetime="2023-09-27T02:51:32.000Z" itemprop="datePublished">2023-09-27</time>
</a>
</div>
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2023/09/27/test/">test</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p>hello!</p>
</div>
<footer class="article-footer">
<a data-url="https://cuzweare.github.io/2023/09/27/test/" data-id="cln2l1aym0000bope7mcz06dz" data-title="test" class="article-share-link"><span class="fa fa-share">分享</span></a>
</footer>
</div>
</article>
<article id="post-hello-world" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2023/09/27/hello-world/" class="article-date">
<time class="dt-published" datetime="2023-09-27T02:50:32.000Z" itemprop="datePublished">2023-09-27</time>
</a>
</div>
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2023/09/27/hello-world/">Hello World</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p>Welcome to <a target="_blank" rel="noopener" href="https://hexo.io/">Hexo</a>! This is your very first post. Check <a target="_blank" rel="noopener" href="https://hexo.io/docs/">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a target="_blank" rel="noopener" href="https://hexo.io/docs/troubleshooting.html">troubleshooting</a> or you can ask me on <a target="_blank" rel="noopener" href="https://github.com/hexojs/hexo/issues">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/writing.html">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/server.html">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/generating.html">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/one-command-deployment.html">Deployment</a></p>
</div>
<footer class="article-footer">
<a data-url="https://cuzweare.github.io/2023/09/27/hello-world/" data-id="cln1yjtqm0000rope3u093u55" data-title="Hello World" class="article-share-link"><span class="fa fa-share">分享</span></a>
</footer>
</div>
</article>
</section>
<aside id="sidebar">
<div class="widget-wrap">
<h3 class="widget-title">分类</h3>
<div class="widget">
<ul class="category-list"><li class="category-list-item"><a class="category-list-link" href="/categories/%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/">学习笔记</a></li></ul>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">标签</h3>
<div class="widget">
<ul class="tag-list" itemprop="keywords"><li class="tag-list-item"><a class="tag-list-link" href="/tags/C/" rel="tag">C++</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92/" rel="tag">动态规划</a></li></ul>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">标签云</h3>
<div class="widget tagcloud">
<a href="/tags/C/" style="font-size: 10px;">C++</a> <a href="/tags/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92/" style="font-size: 10px;">动态规划</a>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">归档</h3>
<div class="widget">
<ul class="archive-list"><li class="archive-list-item"><a class="archive-list-link" href="/archives/2023/09/">九月 2023</a></li></ul>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">最新文章</h3>
<div class="widget">
<ul>
<li>
<a href="/2023/09/27/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92%E2%80%94%E2%80%94%E7%AE%80%E5%8D%95%E7%9A%84%E5%AF%86%E7%A0%81/">动态规划——简单的密码</a>
</li>
<li>
<a href="/2023/09/27/test/">test</a>
</li>
<li>
<a href="/2023/09/27/hello-world/">Hello World</a>
</li>
</ul>
</div>
</div>
</aside>
</div>
<footer id="footer">
<div class="outer">
<div id="footer-info" class="inner">
© 2023 CuzWeAre<br>
Powered by <a href="https://hexo.io/" target="_blank">Hexo</a>
</div>
</div>
</footer>
</div>
<nav id="mobile-nav">
<a href="/" class="mobile-nav-link">Home</a>
<a href="/archives" class="mobile-nav-link">Archives</a>
</nav>
<script src="/js/jquery-3.6.4.min.js"></script>
<script src="/fancybox/jquery.fancybox.min.js"></script>
<script src="/js/script.js"></script>
</div>
</body>
</html>