{"id":565,"date":"2019-01-10T22:09:23","date_gmt":"2019-01-10T14:09:23","guid":{"rendered":"http:\/\/SmokeyDays.top\/wordpress\/?p=565"},"modified":"2019-01-10T22:09:23","modified_gmt":"2019-01-10T14:09:23","slug":"lp1131-zjoi2007-%e6%97%b6%e6%80%81%e5%90%8c%e6%ad%a5","status":"publish","type":"post","link":"http:\/\/SmokeyDays.top\/wordpress\/2019\/01\/10\/lp1131-zjoi2007-%e6%97%b6%e6%80%81%e5%90%8c%e6%ad%a5\/","title":{"rendered":"lp1131 ZJOI2007 \u65f6\u6001\u540c\u6b65"},"content":{"rendered":"\n<p>\u6709\u4e00\u68f5\u6811\uff0c\u6bcf\u6b21\u5c06\u4e00\u6761\u8fb9\u7684\u957f\u5ea6\u589e\u52a01\u7684\u4ee3\u4ef7\u4e3a1\uff0c\u6c42\uff0c\u4f7f\u5f97\u6240\u6709\u53f6\u8282\u70b9\u5230\u6839\u8282\u70b9\u8ddd\u79bb\u76f8\u540c\u7684\u6700\u5c0f\u4ee3\u4ef7\u3002<br>\n\u5f88\u663e\u7136\uff0c\u5bf9\u4e8e\u4e00\u68f5\u6811\u6765\u8bf4\uff0c\u8d2a\u5fc3\u5730\u8003\u8651\uff0c\u6700\u7ec8\u7684\u8ddd\u79bb\u663e\u7136\u662f\u6700\u5f00\u59cb\u7684\u6700\u8fdc\u53f6\u8282\u70b9\u7684\u8ddd\u79bb\u3002<br>\n\u7136\u540e\uff0c\u7ee7\u7eed\u8d2a\u5fc3\u5730\u8003\u8651\uff0c\u6bcf\u4e00\u6b21\u589e\u52a0\u7684\u4ee3\u4ef7\uff0c\u5e94\u5f53\u907f\u514d\u90a3\u4e9b\u5df2\u7ecf\u662f\u6700\u8fdc\u8ddd\u79bb\u7684\u8282\u70b9\u3002<br>\n\u4f46\u662f\u8fd9\u6837\u505a\u7684\u8bdd\u590d\u6742\u5ea6\u6700\u574f\u662fn^2\u7684\u3002<br>\n\u6545\u800c\u6211\u4eec\u8003\u8651\u6811\u5f62DP\u3002\u5bf9\u4e8e\u6bcf\u4e2a\u8282\u70b9\u4e34\u65f6\u8bb0\u4ee5\u8fd9\u4e2a\u8282\u70b9\u4e3a\u6839\u7684\u5b50\u6811\u5b8c\u6210\u65f6\u6001\u540c\u6b65\u9700\u8981\u7684\u4ee3\u4ef7\u3002\u7136\u540e\u6bcf\u4e00\u6b21\u4fee\u6539\u628a\u4fee\u6539\u7ed3\u679c\u8bb0\u4e0b\u6765\u5373\u53ef\u3002 <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include&lt;iostream>\n#include&lt;cstdio>\n\ninline int Max(int A,int B){\n\treturn A>B?A:B;\n}\nstruct ee{\n\tint v;\n\tint w;\n\tint nxt;\n}e[1000005];\nint h[500005],et=0;\ninline void add(int U,int V,int W){\n\te[++et]=(ee){V,W,h[U]};\n\th[U]=et;\n}\nint n,s,f[500005];\nlong long ans=0;\ninline void dfs(int X,int FA){\n\tfor(int i=h[X];i;i=e[i].nxt){\n\t\tif(e[i].v==FA){\n\t\t\tcontinue;\n\t\t}\n\t\tdfs(e[i].v,X);\n\t}\n\tint mx=0;\n\tfor(int i=h[X];i;i=e[i].nxt){\n\t\tif(e[i].v==FA){\n\t\t\tcontinue;\n\t\t}\n\t\tmx=Max(mx,f[e[i].v]+e[i].w);\n\t}\n\tfor(int i=h[X];i;i=e[i].nxt){\n\t\tif(e[i].v==FA){\n\t\t\tcontinue;\n\t\t}\n\t\tans+=mx-(f[e[i].v]+e[i].w);\n\t}\n\tf[X]=mx;\n}\nvoid init(){\n\tscanf(\"%d%d\",&amp;n,&amp;s);\n\tint u,v,w;\n\tfor(int i=1;i&lt;n;++i){\n\t\tscanf(\"%d%d%d\",&amp;u,&amp;v,&amp;w);\n\t\tadd(u,v,w);\n\t\tadd(v,u,w);\n\t}\n\tdfs(s,0);\n\tprintf(\"%lld\\n\",ans);\n}\n\nint main(){\n\tinit();\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6709\u4e00\u68f5\u6811\uff0c\u6bcf\u6b21\u5c06\u4e00\u6761\u8fb9\u7684\u957f\u5ea6\u589e\u52a01\u7684\u4ee3\u4ef7\u4e3a1\uff0c\u6c42\uff0c\u4f7f\u5f97\u6240\u6709\u53f6\u8282\u70b9\u5230\u6839\u8282\u70b9\u8ddd\u79bb\u76f8\u540c\u7684\u6700\u5c0f\u4ee3\u4ef7\u3002 \u5f88\u663e\u7136\uff0c\u5bf9\u4e8e\u4e00\u68f5 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/SmokeyDays.top\/wordpress\/2019\/01\/10\/lp1131-zjoi2007-%e6%97%b6%e6%80%81%e5%90%8c%e6%ad%a5\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201clp1131 ZJOI2007 \u65f6\u6001\u540c\u6b65\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":[34,37,51,8,9,6,5],"tags":[],"_links":{"self":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/565"}],"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=565"}],"version-history":[{"count":1,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/565\/revisions"}],"predecessor-version":[{"id":566,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/565\/revisions\/566"}],"wp:attachment":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/media?parent=565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/categories?post=565"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/tags?post=565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}