https://zh.enter-politics.com/index.php?action=history&feed=atom&title=%E7%81%AB%E8%BD%A6%E5%A4%B4_%28%E4%BF%A1%E6%81%AF%E5%AD%A6%E7%AB%9E%E8%B5%9B%29 2026-07-08T09:44:21Z 本wiki的该页面的版本历史 MediaWiki 1.35.1 https://zh.enter-politics.com/index.php?title=%E7%81%AB%E8%BD%A6%E5%A4%B4_(%E4%BF%A1%E6%81%AF%E5%AD%A6%E7%AB%9E%E8%B5%9B)&diff=6530&oldid=prev 2020-08-16T14:49:59Z

<p></p> <table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="zh"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">←上一版本</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">2020年8月16日 (日) 14:49的版本</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >第1行：</td> <td colspan="2" class="diff-lineno">第1行：</td></tr> <tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''火车头'''是一种信息学竞赛中使用的，用来提升代码运行速度的预处理优化。一般在正规的比赛中被禁止，在正式的开发中亦无应用。</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''火车头'''是一种信息学竞赛中使用的，用来提升代码运行速度的预处理优化。一般在正规的比赛中被禁止，在正式的开发中亦无应用。 <ins class="diffchange diffchange-inline">通常火车头中包含大量的冗余优化以及玄学成分</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== 示例 ==</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== 示例 ==</div></td></tr> <tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l53" >第53行：</td> <td colspan="2" class="diff-lineno">第53行：</td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#pragma GCC optimize(2)</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>#pragma GCC optimize(2)</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/syntaxhighlight&gt;</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/syntaxhighlight&gt;</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">（事实上对于此份优化，仅保留前四行即可）</ins></div></td></tr> <!-- diff cache key mw-wiki2_:diff::1.12:old-6526:rev-6530 --> </table>

RainbowDash https://zh.enter-politics.com/index.php?title=%E7%81%AB%E8%BD%A6%E5%A4%B4_(%E4%BF%A1%E6%81%AF%E5%AD%A6%E7%AB%9E%E8%B5%9B)&diff=6526&oldid=prev 2020-08-16T14:23:59Z

<p>创建页面，内容为“&#039;&#039;&#039;火车头&#039;&#039;&#039;是一种信息学竞赛中使用的，用来提升代码运行速度的预处理优化。一般在正规的比赛中被禁止，在正式的开发中…”</p> <p><b>新页面</b></p><div>'''火车头'''是一种信息学竞赛中使用的，用来提升代码运行速度的预处理优化。一般在正规的比赛中被禁止，在正式的开发中亦无应用。<br /> <br /> == 示例 ==<br /> 这是一个常见的火车头<br /> &lt;syntaxhighlight lang = &quot;cpp&quot;&gt;<br /> #pragma GCC optimize(3)<br /> #pragma GCC target(&quot;avx&quot;)<br /> #pragma GCC optimize(&quot;Ofast&quot;)<br /> #pragma GCC optimize(&quot;inline&quot;)<br /> #pragma GCC optimize(&quot;-fgcse&quot;)<br /> #pragma GCC optimize(&quot;-fgcse-lm&quot;)<br /> #pragma GCC optimize(&quot;-fipa-sra&quot;)<br /> #pragma GCC optimize(&quot;-ftree-pre&quot;)<br /> #pragma GCC optimize(&quot;-ftree-vrp&quot;)<br /> #pragma GCC optimize(&quot;-fpeephole2&quot;)<br /> #pragma GCC optimize(&quot;-ffast-math&quot;)<br /> #pragma GCC optimize(&quot;-fsched-spec&quot;)<br /> #pragma GCC optimize(&quot;unroll-loops&quot;)<br /> #pragma GCC optimize(&quot;-falign-jumps&quot;)<br /> #pragma GCC optimize(&quot;-falign-loops&quot;)<br /> #pragma GCC optimize(&quot;-falign-labels&quot;)<br /> #pragma GCC optimize(&quot;-fdevirtualize&quot;)<br /> #pragma GCC optimize(&quot;-fcaller-saves&quot;)<br /> #pragma GCC optimize(&quot;-fcrossjumping&quot;)<br /> #pragma GCC optimize(&quot;-fthread-jumps&quot;)<br /> #pragma GCC optimize(&quot;-funroll-loops&quot;)<br /> #pragma GCC optimize(&quot;-fwhole-program&quot;)<br /> #pragma GCC optimize(&quot;-freorder-blocks&quot;)<br /> #pragma GCC optimize(&quot;-fschedule-insns&quot;)<br /> #pragma GCC optimize(&quot;inline-functions&quot;)<br /> #pragma GCC optimize(&quot;-ftree-tail-merge&quot;)<br /> #pragma GCC optimize(&quot;-fschedule-insns2&quot;)<br /> #pragma GCC optimize(&quot;-fstrict-aliasing&quot;)<br /> #pragma GCC optimize(&quot;-fstrict-overflow&quot;)<br /> #pragma GCC optimize(&quot;-falign-functions&quot;)<br /> #pragma GCC optimize(&quot;-fcse-skip-blocks&quot;)<br /> #pragma GCC optimize(&quot;-fcse-follow-jumps&quot;)<br /> #pragma GCC optimize(&quot;-fsched-interblock&quot;)<br /> #pragma GCC optimize(&quot;-fpartial-inlining&quot;)<br /> #pragma GCC optimize(&quot;no-stack-protector&quot;)<br /> #pragma GCC optimize(&quot;-freorder-functions&quot;)<br /> #pragma GCC optimize(&quot;-findirect-inlining&quot;)<br /> #pragma GCC optimize(&quot;-fhoist-adjacent-loads&quot;)<br /> #pragma GCC optimize(&quot;-frerun-cse-after-loop&quot;)<br /> #pragma GCC optimize(&quot;inline-small-functions&quot;)<br /> #pragma GCC optimize(&quot;-finline-small-functions&quot;)<br /> #pragma GCC optimize(&quot;-ftree-switch-conversion&quot;)<br /> #pragma GCC optimize(&quot;-foptimize-sibling-calls&quot;)<br /> #pragma GCC optimize(&quot;-fexpensive-optimizations&quot;)<br /> #pragma GCC optimize(&quot;-funsafe-loop-optimizations&quot;)<br /> #pragma GCC optimize(&quot;inline-functions-called-once&quot;)<br /> #pragma GCC optimize(&quot;-fdelete-null-pointer-checks&quot;)<br /> #pragma GCC optimize(2)<br /> &lt;/syntaxhighlight&gt;</div>

RainbowDash