{"id":746,"date":"2026-04-18T08:33:17","date_gmt":"2026-04-18T00:33:17","guid":{"rendered":"http:\/\/wordpress.fangt.online\/?p=746"},"modified":"2026-04-22T15:23:31","modified_gmt":"2026-04-22T07:23:31","slug":"p12312-%e8%93%9d%e6%a1%a5%e6%9d%af-2024-%e5%9b%bd-c-%e5%85%ad%e4%b8%80%e5%84%bf%e7%ab%a5%e8%8a%82","status":"publish","type":"post","link":"http:\/\/wordpress.fangt.online\/index.php\/2026\/04\/18\/p12312-%e8%93%9d%e6%a1%a5%e6%9d%af-2024-%e5%9b%bd-c-%e5%85%ad%e4%b8%80%e5%84%bf%e7%ab%a5%e8%8a%82\/","title":{"rendered":"[\u84dd\u6865\u676f 2024 \u56fd C] \u516d\u4e00\u513f\u7ae5\u8282"},"content":{"rendered":"\n<figure class=\"wp-block-pullquote has-medium-font-size\"><blockquote><p>\u5982\u679cp\u662f\u4e00\u4e2a\u8d28\u6570\uff0c\u800ca\u662f\u4e0ep\u4e92\u8d28\u7684\u4efb\u4e00\u6574\u6570\uff0c\u5219\u6709a^\uff08p-1\uff09\u22611\uff08mod p\uff09\u3002<\/p><cite>\u8d39\u9a6c\u5c0f\u5b9a\u7406<\/cite><\/blockquote><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u98986421\u662f\u4e00\u4e2a\u8d28\u6570\uff0c\u6839\u636e\u8d39\u9a6c\u5c0f\u5b9a\u7406\uff1a\u5982\u679c\u4e00\u4e2a\u6570 a \u4e0d\u662f 6421 \u7684\u500d\u6570\uff0c\u90a3\u4e48 a \u7684 6420 \u6b21\u65b9\u9664\u4ee5 6421 \u7684\u4f59\u6570\u662f 1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5c31\u610f\u5473\u7740\uff1a<strong>a \u7684\u6b21\u65b9\uff0c\u53ea\u770b\u6307\u6570\u9664\u4ee5 6420 \u7684\u4f59\u6570<\/strong>\u5c31\u591f\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5c31\u662f\u8bf4\uff0c\u8981\u8ba1\u7b97x^x\u9664\u4ee56421\u7684\u4f59\u6570\uff0c\u53ea\u9700\u8981\u770b\u5e95\u6570x\u9664\u4ee56421\u7684\u4f59\u6570\uff0c\u6307\u6570x\u9664\u4ee56420\u7684\u4f59\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include&lt;bits\/stdc++.h&gt;\nusing namespace std;\nlong long ans,a&#91;6500],b&#91;6500];\nlong long qpow(long long a,long long b){\n\tlong long ans=1;\n\twhile(b){\n\t\tif(b&amp;1) ans=ans*a%6421;\n\t\tb\/=2;\n\t\ta=a*a%6421;\n\t}\n\treturn ans;\n}\nint main(){\n        \/\/ \u8ba1\u7b97 x^(x-1) mod 6421 \u7684\u6570\u91cf\n\tfor(int i=1;i&lt;=20240601;i++) a&#91;qpow(i%6421,i%6420)]++;\n\tfor(int i=0;i&lt;6421;i++){\n\t\tint j=(6421-i)%6421;\n                if(i&lt;j) ans+=a&#91;i]*a&#91;j];\n                else if(i==j) ans+=a&#91;i]*(a&#91;i]-1)\/2;\n\t}\n\tprintf(\"%lld\",ans);\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u679cp\u662f\u4e00\u4e2a\u8d28\u6570\uff0c\u800ca\u662f\u4e0ep\u4e92\u8d28\u7684\u4efb\u4e00\u6574\u6570\uff0c\u5219\u6709a^\uff08p-1\uff09\u22611\uff08mod p\uff09\u3002 \u8d39\u9a6c\u5c0f\u5b9a\u7406 \u672c\u98986421\u662f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[58],"tags":[],"class_list":["post-746","post","type-post","status-publish","format-standard","hentry","category-st"],"_links":{"self":[{"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/posts\/746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/comments?post=746"}],"version-history":[{"count":3,"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/posts\/746\/revisions"}],"predecessor-version":[{"id":879,"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/posts\/746\/revisions\/879"}],"wp:attachment":[{"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/media?parent=746"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/categories?post=746"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wordpress.fangt.online\/index.php\/wp-json\/wp\/v2\/tags?post=746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}