{"id":709,"date":"2019-03-13T20:02:49","date_gmt":"2019-03-13T12:02:49","guid":{"rendered":"http:\/\/SmokeyDays.top\/wordpress\/?p=709"},"modified":"2019-03-13T20:02:49","modified_gmt":"2019-03-13T12:02:49","slug":"lp4630-apio2018-duathlon-%e9%93%81%e4%ba%ba%e4%b8%a4%e9%a1%b9","status":"publish","type":"post","link":"http:\/\/SmokeyDays.top\/wordpress\/2019\/03\/13\/lp4630-apio2018-duathlon-%e9%93%81%e4%ba%ba%e4%b8%a4%e9%a1%b9\/","title":{"rendered":"lp4630 APIO2018 Duathlon 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<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include&lt;iostream>\n#include&lt;cstdio>\n#define Fv(H,A,X) for(int A=H[X];A;A=e[A].nxt)\n\ninline int Min(int A,int B){\n\treturn A&lt;B?A:B;\n}\n\nstruct ee{\n\tint v;\n\tint nxt;\n}e[1200005];\nint h0[100005],h[200005],et=0;\ninline void Eadd(int *H,int U,int V){\n\te[++et]=(ee){V,H[U]};\n\tH[U]=et;\n}\ninline void add(int *H,int U,int V){\n\tEadd(H,U,V);\n\tEadd(H,V,U);\n}\n\nint n,m;\nint dfn[100005],lw[100005],cnt=0,nm=0;\nint st[100005],tp=0;\nint val[200005],nwsz;\nlong long ans=0;\ninline void dfs(int X){\n\tdfn[X]=lw[X]=++cnt;\n\tst[++tp]=X;\n\t++nwsz;\n\/\/\t\u8981\u6ce8\u610f\u6bcf\u4e2a\u70b9\u7684\u5b50\u6811\u5916\u7684\u8282\u70b9\u7684\u6570\u91cf\u662f\u76f8\u5f53\u4e8e\u8fde\u901a\u5757\u5927\u5c0f\u51cf\u53bb\u5b83\u7684\u5b50\u6811\u5927\u5c0f\uff0c\u800c\u975e\u603b\u8282\u70b9\u6570\u51cf\u53bb\u5b83\u7684\u5b50\u6811\u5927\u5c0f\u3002\u6545\u800c\u8981\u6ce8\u610f\u7edf\u8ba1\u8fde\u901a\u5757\u5927\u5c0f\u3002 \n\tFv(h0,i,X){\n\t\tif(!dfn[e[i].v]){\n\t\t\tdfs(e[i].v);\n\t\t\tlw[X]=Min(lw[X],lw[e[i].v]);\n\t\t\tif(lw[e[i].v]==dfn[X]){\n\/\/\t\t\t\t\u6ce8\u610f\u8fd9\u91cc\u5e94\u5f53\u5224\u5b9a\u7684\u662flw(v)=dfn(u) \n\t\t\t\tval[++nm]=1;\n\t\t\t\tfor(int j=0;j!=e[i].v;--tp){\n\t\t\t\t\t++val[nm];\n\t\t\t\t\tj=st[tp];\n\t\t\t\t\tadd(h,nm,j);\n\t\t\t\t}\n\t\t\t\tadd(h,X,nm);\n\t\t\t}\n\t\t}else{\n\t\t\tlw[X]=Min(lw[X],dfn[e[i].v]);\n\t\t}\n\t}\n}\n\nint vis[200005],sz[200005];\n\ninline void dfs2(int X){\n\tvis[X]=1;\n\tsz[X]=(X&lt;=n);\n\tFv(h,i,X){\n\t\tif(!vis[e[i].v]){\n\t\t\tdfs2(e[i].v);\n\t\t\tans+=2ll*val[X]*sz[X]*sz[e[i].v];\n\t\t\tsz[X]+=sz[e[i].v];\n\t\t}\n\t}\n\tans+=2ll*val[X]*sz[X]*(nwsz-sz[X]);\n}\n\nvoid init(){\n\tscanf(\"%d%d\",&amp;n,&amp;m);\n\tnm=n;\n\tfor(int i=1;i&lt;=n;++i){\n\t\tval[i]=-1;\n\t}\n\tint u,v;\n\tfor(int i=1;i&lt;=m;++i){\n\t\tscanf(\"%d%d\",&amp;u,&amp;v);\n\t\tadd(h0,u,v);\n\t}\n\tfor(int i=1;i&lt;=n;++i){\n\t\tif(!dfn[i]){\n\t\t\tnwsz=0;\n\t\t\tdfs(i);\n\t\t\tdfs2(i);\n\t\t\t--tp;\n\t\t}\n\t}\n\tprintf(\"%lld\\n\",ans);\n}\n\nint main(){\n\tinit();\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5706\u65b9\u6811\u662f\u4e00\u79cd\u5728\u4ed9\u4eba\u638c\u56fe\u4e0a\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4f46\u662f\u8fd9\u5e76\u4e0d\u610f\u5473\u7740\u5706\u65b9\u6811\u53ea\u5728\u4ed9\u4eba\u638c\u56fe\u4e0a\u6709\u7528\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5728\u4efb\u4f55\u4e00\u5f20\u56fe\u4e0a\uff0c\u6211\u4eec &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/SmokeyDays.top\/wordpress\/2019\/03\/13\/lp4630-apio2018-duathlon-%e9%93%81%e4%ba%ba%e4%b8%a4%e9%a1%b9\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201clp4630 APIO2018 Duathlon \u94c1\u4eba\u4e24\u9879\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18,34,37,30,104,51,56,8,6,5],"tags":[],"_links":{"self":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/709"}],"collection":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/comments?post=709"}],"version-history":[{"count":1,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/709\/revisions"}],"predecessor-version":[{"id":710,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/709\/revisions\/710"}],"wp:attachment":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/media?parent=709"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/categories?post=709"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/tags?post=709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}