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<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1"><meta name="format-detection" content="telephone=no"><meta name="apple-mobile-web-app-capable" content="yes"><meta name="apple-mobile-web-app-status-bar-style" content="black"><link rel="icon" href="/images/cdcq.png?v=2.6.2" type="image/png" sizes="16x16"><link rel="icon" href="/images/cdcq.png?v=2.6.2" type="image/png" sizes="32x32"><meta property="og:type" content="website">
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<meta name="twitter:card" content="summary"><title>cdcq | 梦幻小鱼干</title><link ref="canonical" href="http://cdcq.github.io/index.html"><link rel="alternate" href="/atom.xml" type="application/atom+xml"><link rel="dns-prefetch" href="https://cdn.jsdelivr.net"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@5.12.1/css/all.min.css" type="text/css"><link rel="stylesheet" href="/css/index.css?v=2.6.2"><script>var Stun = window.Stun || {};
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window.CONFIG = CONFIG;</script><meta name="generator" content="Hexo 5.4.0"></head><body><div class="container" id="container"><header class="header" id="header"><div class="header-inner"><nav class="header-nav header-nav--fixed"><div class="header-nav-inner"><div class="header-nav-menubtn"><i class="fas fa-bars"></i></div><div class="header-nav-menu"><div class="header-nav-menu-item"><a class="header-nav-menu-item__link" href="/"><span class="header-nav-menu-item__icon"><i class="fas fa-home"></i></span><span class="header-nav-menu-item__text">首页</span></a></div><div class="header-nav-menu-item"><a class="header-nav-menu-item__link" href="/archives/"><span class="header-nav-menu-item__icon"><i class="fas fa-folder-open"></i></span><span class="header-nav-menu-item__text">归档</span></a></div><div class="header-nav-menu-item"><a class="header-nav-menu-item__link" href="/categories/"><span class="header-nav-menu-item__icon"><i class="fas fa-layer-group"></i></span><span class="header-nav-menu-item__text">分类</span></a></div><div class="header-nav-menu-item"><a class="header-nav-menu-item__link" href="/tags/"><span class="header-nav-menu-item__icon"><i class="fas fa-tags"></i></span><span class="header-nav-menu-item__text">标签</span></a></div><div class="header-nav-menu-item"><a class="header-nav-menu-item__link" href="/friends/"><span class="header-nav-menu-item__icon"><i class="fas fa-user-plus"></i></span><span class="header-nav-menu-item__text">Friends</span></a></div></div><div class="header-nav-search"><span class="header-nav-search__icon"><i class="fas fa-search"></i></span><span class="header-nav-search__text">搜索</span></div><div class="header-nav-mode"><div class="mode"><div class="mode-track"><span class="mode-track-moon"></span><span class="mode-track-sun"></span></div><div class="mode-thumb"></div></div></div></div></nav><div class="header-banner"><div class="header-banner-info"><div class="header-banner-info__title">cdcq</div><div class="header-banner-info__subtitle">梦幻小鱼干</div></div><div class="header-banner-arrow"><div class="header-banner-arrow__icon"><i class="fas fa-angle-down"></i></div></div></div></div></header><main class="main" id="main"><div class="main-inner"><div class="content-wrap" id="content-wrap"><div class="content content-home" id="content"><section class="postlist"><article class="postlist-item post"><header class="post-header"><div class="sticky-top" data-popover="置顶文章" data-popover-pos="up"><span class="sticky-top__icon"><i class="fas fa-thumbtack"></i></span></div><h1 class="post-title"><a class="post-title__link" href="/2021/04/10/20210410d/">关于我</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2021-04-10</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-01-06</span></span></div></header><div class="post-body"><div class="post-excerpt"><p>西安电子科技大学网络安全实验班。</p>
<p>原焦作一中 OIer 、ACM 选手和开发选手，现摸鱼选手，有时搞点开发和密码学，最高奖项 NOI D 类铜牌，区域赛银牌。</p>
<p>老博客：<span class="exturl"><a class="exturl__link" target="_blank" rel="noopener" href="https://www.cnblogs.com/cdcq/" >https://www.cnblogs.com/cdcq/</a><span class="exturl__icon"><i class="fas fa-external-link-alt"></i></span></span></p>
<p>老老博客：<span class="exturl"><a class="exturl__link" target="_blank" rel="noopener" href="https://www.cnblogs.com/JSL2018/" >https://www.cnblogs.com/JSL2018/</a><span class="exturl__icon"><i class="fas fa-external-link-alt"></i></span></span></p>
<p>洛古博客：<span class="exturl"><a class="exturl__link" target="_blank" rel="noopener" href="https://www.luogu.com.cn/blog/cdcq/" >https://www.luogu.com.cn/blog/cdcq/</a><span class="exturl__icon"><i class="fas fa-external-link-alt"></i></span></span></p>
<p>（我博客真多 233）</p>
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class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2023/04/26/20230426a/">西电校赛2022D题——数位相邻</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2023-04-26</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2023-04-27</span></span></div></header><div class="post-body"><div class="post-excerpt">似乎是坑题，但可以不踩坑过</div><div class="post-readmore"><a class="post-readmore__link" href="/2023/04/26/20230426a/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/08/28/20220828a/">cdcq的密码学教程四——BM算法</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-08-28</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2023-04-30</span></span></div></header><div class="post-body"><div class="post-excerpt">其实 BM 在 ACM 里有奇效</div><div class="post-readmore"><a class="post-readmore__link" href="/2022/08/28/20220828a/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/08/19/20220819a/">从DFT到FFT——快速傅立叶变换教程</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-08-19</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2023-04-30</span></span></div></header><div class="post-body"><div class="post-excerpt">FFT其实也挺简单的</div><div class="post-readmore"><a class="post-readmore__link" href="/2022/08/19/20220819a/"><span class="post-readmore__text">阅读全文</span><span 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$.ajax({
url: path,
dataType: isXML ? 'xml' : 'json',
async: true,
success: function (res) {
var datas = isXML ? $('entry', res).map(function () {
// 将 XML 转为 JSON
return {
title: $('title', this).text(),
content: $('content', this).text(),
url: $('url', this).text()
};
}).get() : res;
var $input = $('.search-input input');
var $result = $('.search-results');
// 搜索对象（标题、内容）的权重，影响显示顺序
var WEIGHT = { title: 100, content: 1 };
var searchPost = function () {
var searchText = $input.val().toLowerCase().trim();
// 根据空白字符分隔关键字
var keywords = searchText.split(/[\s]+/);
// 搜索结果
var matchPosts = [];
// 有多个关键字时，将原文字整个保存下来
if (keywords.length > 1) {
keywords.push(searchText);
}
// 防止未输入字符时搜索
if (searchText.length > 0) {
datas.forEach(function (data) {
var isMatch = false;
// 没有标题的文章使用预设的 i18n 变量代替
var title = (data.title && data.title.trim()) || '[ 文章无标题 ]';
var titleLower = title && title.toLowerCase();
// 删除 HTML 标签 和 所有空白字符
var content = data.content && data.content.replace(/<[^>]+>/g, '');
var contentLower = content && content.toLowerCase();
// 删除重复的 /
var postURL = data.url && decodeURI(data.url).replace(/\/{2,}/g, '/');
// 标题中匹配到的关键词
var titleHitSlice = [];
// 内容中匹配到的关键词
var contentHitSlice = [];
keywords.forEach(function (keyword) {
/**
* 获取匹配的关键词的索引
* @param {String} keyword 要匹配的关键字
* @param {String} text 原文字
* @param {Boolean} caseSensitive 是否区分大小写
* @param {Number} weight 匹配对象的权重。权重大的优先显示
* @return {Array}
*/
function getIndexByword (word, text, caseSensitive, weight) {
if (!word || !text) {
return [];
};
var startIndex = 0; // 每次匹配的开始索引
var index = -1; // 匹配到的索引值
var result = []; // 匹配结果
if (!caseSensitive) {
word = word.toLowerCase();
text = text.toLowerCase();
}
while((index = text.indexOf(word, startIndex)) !== -1) {
var hasMatch = false;
// 索引位置相同的关键词，保留长度较长的
titleHitSlice.forEach(function (hit) {
if (hit.index === index && hit.word.length < word.length) {
hit.word = word;
hasMatch = true;
}
});
startIndex = index + word.length;
!hasMatch && result.push({ index: index, word: word, weight: weight });
}
return result;
}
titleHitSlice = titleHitSlice.concat(getIndexByword(keyword, titleLower, false, WEIGHT.title));
contentHitSlice = contentHitSlice.concat(getIndexByword(keyword, contentLower, false, WEIGHT.content));
});
var hitTitle = titleHitSlice.length;
var hitContent = contentHitSlice.length;
if (hitTitle > 0 || hitContent > 0) {
isMatch = true;
}
if (isMatch) {
;[titleHitSlice, contentHitSlice].forEach(function (hit) {
// 按照匹配文字的索引的递增顺序排序
hit.sort(function (left, right) {
return left.index - right.index;
});
});
/**
* 给文本中匹配到的关键词添加标记，从而进行高亮显示
* @param {String} text 原文本
* @param {Array} hitSlice 匹配项的索引信息
* @param {Number} start 开始索引
* @param {Number} end 结束索引
* @return {String}
*/
function highlightKeyword (text, hitSlice, start, end) {
if (!text || !hitSlice || !hitSlice.length) {
return;
}
var result = '';
var startIndex = start;
var endIndex = end;
hitSlice.forEach(function (hit) {
if (hit.index < startIndex) {
return;
}
var hitWordEnd = hit.index + hit.word.length;
result += text.slice(startIndex, hit.index);
result += '<b>' + text.slice(hit.index, hitWordEnd) + '</b>';
startIndex = hitWordEnd;
});
result += text.slice(startIndex, endIndex);
return result;
}
var postData = {};
// 文章总的搜索权重
var postWeight = titleHitSlice.length * WEIGHT.title + contentHitSlice.length * WEIGHT.content;
// 标记匹配关键词后的标题
var postTitle = highlightKeyword(title, titleHitSlice, 0, title.length) || title;
// 标记匹配关键词后的内容
var postContent;
// 显示内容的长度
var SHOW_WORD_LENGTH = 200;
// 命中关键词前的字符显示长度
var SHOW_WORD_FRONT_LENGTH = 20;
var SHOW_WORD_END_LENGTH = SHOW_WORD_LENGTH - SHOW_WORD_FRONT_LENGTH;
// 截取匹配的第一个字符，前后共 200 个字符来显示
if (contentHitSlice.length > 0) {
var firstIndex = contentHitSlice[0].index;
var start = firstIndex > SHOW_WORD_FRONT_LENGTH ? firstIndex - SHOW_WORD_FRONT_LENGTH : 0;
var end = firstIndex + SHOW_WORD_END_LENGTH;
postContent = highlightKeyword(content, contentHitSlice, start, end);
} else { // 未匹配到内容，直接截取前 200 个字符来显示
postContent = content.slice(0, SHOW_WORD_LENGTH);
}
postData.title = postTitle;
postData.content = postContent;
postData.url = postURL;
postData.weight = postWeight;
matchPosts.push(postData);
}
});
}
var resultInnerHtml = '';
if (matchPosts.length) {
// 按权重递增的顺序排序，使权重大的优先显示
matchPosts.sort(function (left, right) {
return right.weight - left.weight;
});
resultInnerHtml += '<ul>';
matchPosts.forEach(function (post) {
resultInnerHtml += '<li><a class="search-results-title" href="' + post.url + '">';
resultInnerHtml += post.title;
resultInnerHtml += '</a><div class="search-results-content">';
resultInnerHtml += post.content;
resultInnerHtml += '</div></li>';
});
resultInnerHtml += '</ul>';
} else {
resultInnerHtml += '<div class="search-results-none"><i class="far fa-meh"></i></div>';
}
$result.html(resultInnerHtml);
};
$input.on('input', searchPost);
$input.on('keyup', function (e) {
if (e.keyCode === Stun.utils.codeToKeyCode('Enter')) {
searchPost();
}
});
}
});
}
function closeSearch () {
$('body').css({ overflow: 'auto' });
$('.search-popup').css({ display: 'none' });
$('.search-mask').css({ display: 'none' });
}
window.addEventListener('DOMContentLoaded', function () {
Stun.utils.pjaxReloadLocalSearch = function () {
$('.header-nav-search').on('click', function (e) {
e.stopPropagation();
$('body').css('overflow', 'hidden');
$('.search-popup')
.velocity('stop')
.velocity('transition.expandIn', {
duration: 300,
complete: function () {
$('.search-popup input').focus();
}
});
$('.search-mask')
.velocity('stop')
.velocity('transition.fadeIn', {
duration: 300
});
initSearch();
});
$('.search-mask, .search-close').on('click', function () {
closeSearch();
});
$(document).on('keydown', function (e) {
// Escape <=> 27
if (e.keyCode === Stun.utils.codeToKeyCode('Escape')) {
closeSearch();
}
});
};
Stun.utils.pjaxReloadLocalSearch();
}, false);
function safeOpenUrl(url) {
var newTab = window.open();
newTab.opener = null;
newTab.location = url;
}
function extSearch(engine) {
var engines = {
google: 'https://www.google.com/search?q=',
bing: 'https://cn.bing.com/search?q=',
baidu: 'https://www.baidu.com/s?ie=UTF-8&wd=',
};
var host = window.location.host;
var query = $('.search-input input').val().toLowerCase().trim();
var uri = engines[engine] + query + ' site:' + host;
if (query) {
safeOpenUrl(uri);
} else {
Stun.utils.popAlert('warning', '请输入字符');
}
}
var assistSearchList = window.CONFIG.assistSearch;
if (Array.isArray(assistSearchList)) {
assistSearchList.forEach(function (name) {
document.querySelector('.search-btns-item--' + name).addEventListener('click', function () {
extSearch(name);
}, false);
});
}</script><link href="https://cdn.jsdelivr.net/npm/katex@0.10.2/dist/katex.min.css" rel="stylesheet" type="text/css"><link href="https://cdn.jsdelivr.net/npm/katex@0.10.2/dist/contrib/copy-tex.css" rel="stylesheet" type="text/css"><script src="https://cdn.jsdelivr.net/npm/katex@0.10.2/dist/contrib/copy-tex.min.js"></script><script src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js" async></script><script src="/js/utils.js?v=2.6.2"></script><script src="/js/stun-boot.js?v=2.6.2"></script><script src="/js/scroll.js?v=2.6.2"></script><script src="/js/header.js?v=2.6.2"></script><script src="/js/sidebar.js?v=2.6.2"></script><script type="application/json" src="/search.xml"></script></body></html>