{"id":96,"date":"2024-10-19T14:55:31","date_gmt":"2024-10-19T14:55:31","guid":{"rendered":"https:\/\/burningthepasttvt.damo.sg\/?p=96"},"modified":"2024-10-19T14:55:31","modified_gmt":"2024-10-19T14:55:31","slug":"%e6%96%b0%e5%ae%9a%e4%b9%89%e5%a5%87%e6%95%b0%e8%bf%98%e6%98%af%e5%81%b6%e6%95%b0","status":"publish","type":"post","link":"https:\/\/burningthepasttvt.damo.sg\/?p=96","title":{"rendered":"\u65b0\u5b9a\u4e49\u5947\u6570\u8fd8\u662f\u5076\u6570"},"content":{"rendered":"\n<p>\u9898\u76ee<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"918\" height=\"512\" src=\"https:\/\/burningthepasttvt.damo.sg\/wp-content\/uploads\/2024\/10\/image.png\" alt=\"\" class=\"wp-image-97\" style=\"width:650px;height:auto\" srcset=\"https:\/\/burningthepasttvt.damo.sg\/wp-content\/uploads\/2024\/10\/image.png 918w, https:\/\/burningthepasttvt.damo.sg\/wp-content\/uploads\/2024\/10\/image-300x167.png 300w, https:\/\/burningthepasttvt.damo.sg\/wp-content\/uploads\/2024\/10\/image-768x428.png 768w\" sizes=\"auto, (max-width: 918px) 100vw, 918px\" \/><\/figure>\n\n\n\n<p>\u89e3\u7b54\uff1a<\/p>\n\n\n\n<p>#include&lt;stdio.h><\/p>\n\n\n\n<p>#include&lt;string.h><\/p>\n\n\n\n<p>#define MAXN 5000005<\/p>\n\n\n\n<p>int is_prime[MAXN]; \/\/ \u7528\u6765\u6807\u8bb0\u8d28\u6570<br>int factor_count[MAXN]; \/\/ \u7528\u6765\u8ba1\u6570\u6bcf\u4e2a\u6570\u5b57\u7684\u8d28\u56e0\u6570\u6570\u91cf<\/p>\n\n\n\n<p>void sieve() {<br>memset(is_prime, 1, sizeof(is_prime));<br>memset(factor_count, 0, sizeof(factor_count));<br>is_prime[0] = is_prime[1] = 0; \/\/ 0\u548c1\u65e2\u4e0d\u662f\u5947\u6570\u4e5f\u4e0d\u662f\u5076\u6570<br>for (int i = 2; i &lt; MAXN; i++) {<br>if (is_prime[i]) {<br>for (int j = i; j &lt; MAXN; j += i) {<br>is_prime[j] = 0; \/\/ \u6807\u8bb0\u975e\u8d28\u6570<br>factor_count[j]++; \/\/ \u589e\u52a0\u8d28\u56e0\u6570\u8ba1\u6570<br>}<br>}<br>}<br>}<\/p>\n\n\n\n<p>int main() {<br>int n;<br>scanf(&#8220;%d&#8221;, &amp;n);<br>sieve();<br>int even_count = 0;<br>for (int i = 2; i &lt;= n; i++) { if (factor_count[i] &gt; 1) {<br>even_count++;<br>}<br>}<br>printf(&#8220;%d\\n&#8221;, even_count);<br>return 0;<br>}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee \u89e3\u7b54\uff1a #include&lt;stdio.h> #include&lt;string.h> #defi [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-96","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts\/96","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=96"}],"version-history":[{"count":1,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts\/96\/revisions"}],"predecessor-version":[{"id":98,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts\/96\/revisions\/98"}],"wp:attachment":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=96"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=96"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=96"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}