﻿<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>C++博客-InnooI</title><link>http://www.cppblog.com/frosty319424/</link><description>FrOsTy</description><language>zh-cn</language><lastBuildDate>Tue, 09 Jun 2026 19:10:59 GMT</lastBuildDate><pubDate>Tue, 09 Jun 2026 19:10:59 GMT</pubDate><ttl>60</ttl><item><title>poj 1742</title><link>http://www.cppblog.com/frosty319424/archive/2011/02/16/140186.html</link><dc:creator>Innooi</dc:creator><author>Innooi</author><pubDate>Wed, 16 Feb 2011 12:48:00 GMT</pubDate><guid>http://www.cppblog.com/frosty319424/archive/2011/02/16/140186.html</guid><wfw:comment>http://www.cppblog.com/frosty319424/comments/140186.html</wfw:comment><comments>http://www.cppblog.com/frosty319424/archive/2011/02/16/140186.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.cppblog.com/frosty319424/comments/commentRss/140186.html</wfw:commentRss><trackback:ping>http://www.cppblog.com/frosty319424/services/trackbacks/140186.html</trackback:ping><description><![CDATA[<p><font style="FONT-SIZE: 22px">PKU 1742 Coins</font></p>
<p>楼教主男人八题的最简单一题，如果用传统的多重背包来解就是0(nmc)的复杂度，必然超时。</p>
<p>复习了一会儿背包九讲，研究出来了2种做法:</p>
<p>1.将c[i]分为二进制，例如15分为1 2 48个背包利用2^k个物品来背包，即可将c[i]优化到log(c[i])的程度。</p>
<p>2.还有一种称为是单调队列优化的方法，查阅了很多资料没有看到。</p>
<p><wbr></p>
<p>研究了解题报告后，大概方法是这样的，利用一个count[j]数组记录当前物品表达j这个状态时所需要的硬币数目，由于题目要求所枚举状态只需要知道是否可行，并不需要得到一个最优解，所以每次都只更新还没有更新过的状态，这样就不会出现某个状态用1个i硬币或2个i硬币都能表达的情况。</p>
<p>&#160;</p>
<div style="BORDER-BOTTOM: #cccccc 1px solid; BORDER-LEFT: #cccccc 1px solid; PADDING-BOTTOM: 4px; BACKGROUND-COLOR: #eeeeee; PADDING-LEFT: 4px; WIDTH: 98%; PADDING-RIGHT: 5px; FONT-SIZE: 13px; WORD-BREAK: break-all; BORDER-TOP: #cccccc 1px solid; BORDER-RIGHT: #cccccc 1px solid; PADDING-TOP: 4px"><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif"><span style="COLOR: #000000">#include&nbsp;</span><span style="COLOR: #000000">&lt;</span><span style="COLOR: #000000">iostream</span><span style="COLOR: #000000">&gt;</span><span style="COLOR: #000000"><br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif">&nbsp;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif"></span><span style="COLOR: #0000ff">using</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #0000ff">namespace</span><span style="COLOR: #000000">&nbsp;std;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif">&nbsp;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif"></span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;n,&nbsp;m;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif">&nbsp;</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;v[MAXN],&nbsp;c[MAXN];<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif">&nbsp;</span><span style="COLOR: #0000ff">bool</span><span style="COLOR: #000000">&nbsp;f[</span><span style="COLOR: #000000">100001</span><span style="COLOR: #000000">];<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif">&nbsp;</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;coun[</span><span style="COLOR: #000000">100001</span><span style="COLOR: #000000">];<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif">&nbsp;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif"></span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;main()<br><img id=Codehighlighter1_128_910_Open_Image onclick="this.style.display='none'; Codehighlighter1_128_910_Open_Text.style.display='none'; Codehighlighter1_128_910_Closed_Image.style.display='inline'; Codehighlighter1_128_910_Closed_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockStart.gif"><img style="DISPLAY: none" id=Codehighlighter1_128_910_Closed_Image onclick="this.style.display='none'; Codehighlighter1_128_910_Closed_Text.style.display='none'; Codehighlighter1_128_910_Open_Image.style.display='inline'; Codehighlighter1_128_910_Open_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ContractedBlock.gif">&nbsp;</span><span style="BORDER-BOTTOM: #808080 1px solid; BORDER-LEFT: #808080 1px solid; BACKGROUND-COLOR: #ffffff; DISPLAY: none; BORDER-TOP: #808080 1px solid; BORDER-RIGHT: #808080 1px solid" id=Codehighlighter1_128_910_Closed_Text><img src="http://www.cppblog.com/Images/dot.gif"></span><span id=Codehighlighter1_128_910_Open_Text><span style="COLOR: #000000">{<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">while</span><span style="COLOR: #000000">(</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">)<br><img id=Codehighlighter1_149_892_Open_Image onclick="this.style.display='none'; Codehighlighter1_149_892_Open_Text.style.display='none'; Codehighlighter1_149_892_Closed_Image.style.display='inline'; Codehighlighter1_149_892_Closed_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif"><img style="DISPLAY: none" id=Codehighlighter1_149_892_Closed_Image onclick="this.style.display='none'; Codehighlighter1_149_892_Closed_Text.style.display='none'; Codehighlighter1_149_892_Open_Image.style.display='inline'; Codehighlighter1_149_892_Open_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ContractedSubBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="BORDER-BOTTOM: #808080 1px solid; BORDER-LEFT: #808080 1px solid; BACKGROUND-COLOR: #ffffff; DISPLAY: none; BORDER-TOP: #808080 1px solid; BORDER-RIGHT: #808080 1px solid" id=Codehighlighter1_149_892_Closed_Text><img src="http://www.cppblog.com/Images/dot.gif"></span><span id=Codehighlighter1_149_892_Open_Text><span style="COLOR: #000000">{<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;scanf(</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">%d%d</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">,&nbsp;</span><span style="COLOR: #000000">&amp;</span><span style="COLOR: #000000">n,&nbsp;</span><span style="COLOR: #000000">&amp;</span><span style="COLOR: #000000">m);<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">if</span><span style="COLOR: #000000">(</span><span style="COLOR: #000000">!</span><span style="COLOR: #000000">n&nbsp;</span><span style="COLOR: #000000">&amp;&amp;</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">!</span><span style="COLOR: #000000">m)&nbsp;exit(</span><span style="COLOR: #000000">0</span><span style="COLOR: #000000">);<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;memset(f,&nbsp;</span><span style="COLOR: #000000">0</span><span style="COLOR: #000000">,&nbsp;</span><span style="COLOR: #0000ff">sizeof</span><span style="COLOR: #000000">(f));<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f[</span><span style="COLOR: #000000">0</span><span style="COLOR: #000000">]&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">for</span><span style="COLOR: #000000">(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;i&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;&nbsp;i&nbsp;</span><span style="COLOR: #000000">&lt;=</span><span 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#000000">;&nbsp;i&nbsp;</span><span style="COLOR: #000000">&lt;=</span><span style="COLOR: #000000">&nbsp;n;&nbsp;i</span><span style="COLOR: #000000">++</span><span style="COLOR: #000000">)<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;scanf(</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">%d</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">,&nbsp;c&nbsp;</span><span style="COLOR: #000000">+</span><span style="COLOR: #000000">&nbsp;i);<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">for</span><span style="COLOR: #000000">(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;i&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;&nbsp;i&nbsp;</span><span style="COLOR: #000000">&lt;=</span><span style="COLOR: #000000">&nbsp;n;&nbsp;i</span><span style="COLOR: #000000">++</span><span style="COLOR: #000000">)<br><img id=Codehighlighter1_453_766_Open_Image onclick="this.style.display='none'; Codehighlighter1_453_766_Open_Text.style.display='none'; Codehighlighter1_453_766_Closed_Image.style.display='inline'; Codehighlighter1_453_766_Closed_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif"><img style="DISPLAY: none" id=Codehighlighter1_453_766_Closed_Image onclick="this.style.display='none'; Codehighlighter1_453_766_Closed_Text.style.display='none'; Codehighlighter1_453_766_Open_Image.style.display='inline'; Codehighlighter1_453_766_Open_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ContractedSubBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="BORDER-BOTTOM: #808080 1px solid; BORDER-LEFT: #808080 1px solid; BACKGROUND-COLOR: #ffffff; DISPLAY: none; BORDER-TOP: #808080 1px solid; BORDER-RIGHT: #808080 1px solid" id=Codehighlighter1_453_766_Closed_Text><img src="http://www.cppblog.com/Images/dot.gif"></span><span id=Codehighlighter1_453_766_Open_Text><span style="COLOR: #000000">{<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">for</span><span style="COLOR: #000000">(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;j&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;&nbsp;j&nbsp;</span><span style="COLOR: #000000">&lt;=</span><span style="COLOR: #000000">&nbsp;m;&nbsp;j</span><span style="COLOR: #000000">++</span><span style="COLOR: #000000">)<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;coun[j]&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">0</span><span style="COLOR: #000000">;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">for</span><span style="COLOR: #000000">(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;j&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;v[i];&nbsp;j&nbsp;</span><span style="COLOR: #000000">&lt;=</span><span style="COLOR: #000000">&nbsp;m;&nbsp;j</span><span style="COLOR: #000000">++</span><span style="COLOR: #000000">)<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">if</span><span style="COLOR: #000000">(f[j&nbsp;</span><span style="COLOR: #000000">-</span><span style="COLOR: #000000">&nbsp;v[i]]&nbsp;</span><span style="COLOR: #000000">&amp;&amp;</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">!</span><span style="COLOR: #000000">f[j]&nbsp;</span><span style="COLOR: #000000">&amp;&amp;</span><span style="COLOR: #000000">&nbsp;coun[j&nbsp;</span><span style="COLOR: #000000">-</span><span style="COLOR: #000000">&nbsp;v[i]]&nbsp;</span><span style="COLOR: #000000">&lt;</span><span style="COLOR: #000000">&nbsp;c[i])<br><img id=Codehighlighter1_654_755_Open_Image onclick="this.style.display='none'; Codehighlighter1_654_755_Open_Text.style.display='none'; Codehighlighter1_654_755_Closed_Image.style.display='inline'; Codehighlighter1_654_755_Closed_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif"><img style="DISPLAY: none" id=Codehighlighter1_654_755_Closed_Image onclick="this.style.display='none'; Codehighlighter1_654_755_Closed_Text.style.display='none'; Codehighlighter1_654_755_Open_Image.style.display='inline'; Codehighlighter1_654_755_Open_Text.style.display='inline';" align=top src="http://www.cppblog.com/Images/OutliningIndicators/ContractedSubBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="BORDER-BOTTOM: #808080 1px solid; BORDER-LEFT: #808080 1px solid; BACKGROUND-COLOR: #ffffff; DISPLAY: none; BORDER-TOP: #808080 1px solid; BORDER-RIGHT: #808080 1px solid" id=Codehighlighter1_654_755_Closed_Text><img src="http://www.cppblog.com/Images/dot.gif"></span><span id=Codehighlighter1_654_755_Open_Text><span style="COLOR: #000000">{<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;coun[j]&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;coun[j&nbsp;</span><span style="COLOR: #000000">-</span><span style="COLOR: #000000">&nbsp;v[i]]&nbsp;</span><span style="COLOR: #000000">+</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f[j]&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}</span></span><span style="COLOR: #000000"><br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}</span></span><span style="COLOR: #000000"><br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;ans&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">0</span><span style="COLOR: #000000">;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">for</span><span style="COLOR: #000000">(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">&nbsp;i&nbsp;</span><span style="COLOR: #000000">=</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;&nbsp;i&nbsp;</span><span style="COLOR: #000000">&lt;=</span><span style="COLOR: #000000">&nbsp;m;&nbsp;i</span><span style="COLOR: #000000">++</span><span style="COLOR: #000000">)<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">if</span><span style="COLOR: #000000">(f[i])&nbsp;ans</span><span style="COLOR: #000000">++</span><span style="COLOR: #000000">;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf(</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">%d\n</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">,&nbsp;ans);<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}</span></span><span style="COLOR: #000000"><br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="COLOR: #0000ff">return</span><span style="COLOR: #000000">&nbsp;</span><span style="COLOR: #000000">0</span><span style="COLOR: #000000">;<br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockEnd.gif">&nbsp;}</span></span><span style="COLOR: #000000"><br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif"><br><img align=top src="http://www.cppblog.com/Images/OutliningIndicators/None.gif"></span></div>
<p><wbr></p>
<p>&nbsp;</p>
<p><br>&nbsp;</p>
<img src ="http://www.cppblog.com/frosty319424/aggbug/140186.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.cppblog.com/frosty319424/" target="_blank">Innooi</a> 2011-02-16 20:48 <a href="http://www.cppblog.com/frosty319424/archive/2011/02/16/140186.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>