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Codeforces680B.html
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Codeforces680B.html
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<!DOCTYPE html><html class="theme-next pisces use-motion" lang="zh-CN"><head><meta name="generator" content="Hexo 3.9.0"><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=2"><meta name="theme-color" content="#222"><link rel="apple-touch-icon" sizes="180x180" href="/images/icons/favicon-48.png?v=6.7.0"><link rel="icon" type="image/png" sizes="32x32" href="/images/icons/favicon-32.png?v=6.7.0"><link rel="icon" type="image/png" sizes="16x16" href="/images/icons/favicon-16.png?v=6.7.0"><link rel="mask-icon" href="/images/icons/logo.svg?v=6.7.0" color="#222"><link rel="alternate" href="/atom.xml" title="菠菜眾長" type="application/atom+xml"><meta http-equiv="Cache-Control" content="no-transform"><meta http-equiv="Cache-Control" content="no-siteapp"><link href="/lib/fancybox/source/jquery.fancybox.css" rel="stylesheet" type="text/css"><link 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id="posts" class="posts-expand"><div class="reading-progress-bar"></div><article class="post post-type-normal" itemscope itemtype="http://schema.org/Article"><div class="post-block"><link itemprop="mainEntityOfPage" href="https://lruihao.cn/posts/Codeforces680B.html"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="name" content="李瑞豪"><meta itemprop="description" content="从ACM到Web，分享程序、技巧、干货，记录心情、学习、成长！"><meta itemprop="image" content="/images/avatar.png"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="菠菜眾長"></span><header class="post-header"><h2 class="post-title" itemprop="name headline">Bear and Finding Criminals-Codeforces680B<a href="https://github.com/Lruihao/lruihao.github.io/tree/hexo/source/_posts/Codeforces680B.md" class="post-edit-link" title="编辑" rel="external nofollow noopener noreferrer" target="_blank"><i class="fa fa-pencil"></i></a></h2><div class="post-meta"><span class="post-time"><span class="post-meta-item-icon"><i class="fa fa-calendar-o"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2018-07-31 19:32:21" itemprop="dateCreated datePublished" datetime="2018-07-31T19:32:21+08:00">2018-07-31</time> </span><span class="post-category"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-folder-o"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/ACM/" itemprop="url" rel="index"><span itemprop="name">ACM</span></a></span> </span><span class="post-comments-count"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-comment-o"></i> </span><span class="post-meta-item-text">评论数： </span><a href="/posts/Codeforces680B.html#comments" itemprop="discussionUrl"><span class="post-comments-count valine-comment-count" data-xid="/posts/Codeforces680B.html" itemprop="commentCount"></span> </a></span><span id="/posts/Codeforces680B.html" class="leancloud_visitors" data-flag-title="Bear and Finding Criminals-Codeforces680B"><span class="post-meta-divider">|</span> <span title="阅读次数"><span class="post-meta-item-icon"><i class="fa fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span></span></span><div class="post-symbolscount"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-file-word-o"></i> </span><span class="post-meta-item-text">本文字数：</span> <span title="本文字数">317</span> <span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-clock-o"></i> </span><span class="post-meta-item-text">阅读时长 ≈</span> <span title="阅读时长">1 分钟</span></div></div></header><div class="post-body" itemprop="articleBody"><p>题目链接：<a href="https://codeforces.com/problemset/problem/680/B" rel="external nofollow noopener noreferrer" target="_blank">Bear and Finding Criminals</a></p><p>大致题意就是小熊警察住在某个城市，他要抓各个城市的罪犯，现在用一个BCD可以知道那个城市里<strong>一定</strong>有罪犯。</p><p>一定能确定该城市有小偷的几种情况：<br>1.警察所住城市有罪犯，则一定能检测到</p><p>2.警察所住城市的左边和右边位置若<strong>都</strong>不为0，则说明两座城市都有罪犯（只有一边为1是不能确定到底哪个城市有罪犯的）</p><p>3.警察所在城市的一边检测到有罪犯，但在另一边已经没有城市了，则说明该城市一定有罪犯</p><a id="more"></a><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></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><bits/stdc++.h></span></span></span><br><span class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="built_in">std</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">int</span> t[<span class="number">107</span>];</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">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="keyword">int</span> n, a;</span><br><span class="line"> <span class="keyword">while</span>(<span class="built_in">cin</span>>>n>>a){</span><br><span class="line"> <span class="keyword">int</span> sum = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i =<span class="number">1</span>; i <= n; i++)</span><br><span class="line"> <span class="built_in">cin</span> >> t[i];</span><br><span class="line"> <span class="keyword">if</span>(t[a]) sum++;<span class="comment">//小熊所在城市有罪犯</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">1</span>; i <= n; i++){</span><br><span class="line"> <span class="keyword">if</span>(a-i > <span class="number">0</span>&&a+i <= n) {</span><br><span class="line"> <span class="keyword">if</span>(t[a-i] == <span class="number">1</span>&&t[a+i] == <span class="number">1</span>)</span><br><span class="line"> sum+=<span class="number">2</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span>(a-i <= <span class="number">0</span>&&a+i <= n){<span class="comment">//警察在第一个点</span></span><br><span class="line"> <span class="keyword">if</span>(t[a+i])</span><br><span class="line"> sum++;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span>(a-i > <span class="number">0</span>&&a+i > n){</span><br><span class="line"> <span class="keyword">if</span>(t[a-i])</span><br><span class="line"> sum++;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="built_in">cout</span> <<sum<<<span class="built_in">endl</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></pre></td></tr></table></figure></div><div class="popular-posts-header"><i class="fa fa-link"></i> 相关文章</div><!--[if !IE]><!--><details><summary style="cursor:pointer">点击查看</summary><!--<![endif]--><ul class="popular-posts"><li class="popular-posts-item"><div class="popular-posts-title"><a href="\posts\codeforces476a.html" rel="bookmark">Dreamoon and Stairs</a></div></li><li class="popular-posts-item"><div class="popular-posts-title"><a href="\posts\codeforces476b.html" rel="bookmark">Dreamoon and WiFi(组合数学)</a></div></li><li class="popular-posts-item"><div class="popular-posts-title"><a href="\posts\Codeforces680A.html" rel="bookmark">Bear and Five Cards-Codeforces680A</a></div></li><li class="popular-posts-item"><div class="popular-posts-title"><a href="\posts\Piles-with-stones.html" rel="bookmark">Piles-with-stones</a></div></li><li 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return resultRight.searchTextCount - resultLeft.searchTextCount;
} else if (resultLeft.hitCount !== resultRight.hitCount) {
return resultRight.hitCount - resultLeft.hitCount;
} else {
return resultRight.id - resultLeft.id;
}
});
var searchResultList = '<ul class=\"search-result-list\">';
resultItems.forEach(function (result) {
searchResultList += result.item;
})
searchResultList += "</ul>";
resultContent.innerHTML = searchResultList;
}
}
if ('auto' === 'auto') {
input.addEventListener('input', inputEventFunction);
} else {
$('.search-icon').click(inputEventFunction);
input.addEventListener('keypress', function (event) {
if (event.keyCode === 13) {
inputEventFunction();
}
});
}
// remove loading animation
$(".local-search-pop-overlay").remove();
$('body').css('overflow', '');
proceedsearch();
}
});
}
// handle and trigger popup window;
$('.popup-trigger').click(function(e) {
e.stopPropagation();
if (isfetched === false) {
searchFunc(path, 'local-search-input', 'local-search-result');
} else {
proceedsearch();
};
});
$('.popup-btn-close').click(onPopupClose);
$('.popup').click(function(e){
e.stopPropagation();
});
$(document).on('keyup', function (event) {
var shouldDismissSearchPopup = event.which === 27 &&
$('.search-popup').is(':visible');
if (shouldDismissSearchPopup) {
onPopupClose();
}
});</script><script>!function(){var t=document.createElement("script"),e=window.location.protocol.split(":")[0];t.src="https"===e?"https://zz.bdstatic.com/linksubmit/push.js":"http://push.zhanzhang.baidu.com/push.js";var s=document.getElementsByTagName("script")[0];s.parentNode.insertBefore(t,s)}()</script><script src="/lib/pangu/dist/pangu.min.js?v=3.3"></script><script type="text/javascript">pangu.spacingPage()</script><script src="/lib/bookmark/bookmark.min.js?v=1.0"></script><script type="text/javascript">bookmark.scrollToMark("manual","#更多")</script><script>!function(e){var r=Array.prototype.slice.call(document.querySelectorAll("img[data-original]"));function t(){for(var c=0;c<r.length;c++)t=r[c],void 0,0<=(n=t.getBoundingClientRect()).top&&0<=n.left&&n.top<=(e.innerHeight||document.documentElement.clientHeight)&&function(){var t,n,e,i,o=r[c];t=o,n=function(){r=r.filter(function(t){return o!==t})},e=new Image,i=t.getAttribute("data-original"),e.onload=function(){t.src=i,n&&n()},e.src=i}();var t,n}t(),e.addEventListener("scroll",function(){!function(t,n){clearTimeout(t.tId),t.tId=setTimeout(function(){t.call(n)},500)}(t,e)})}(this);</script></body></html>