{"id":831,"date":"2019-03-27T21:56:06","date_gmt":"2019-03-27T13:56:06","guid":{"rendered":"http:\/\/SmokeyDays.top\/wordpress\/?p=831"},"modified":"2019-03-27T21:58:51","modified_gmt":"2019-03-27T13:58:51","slug":"lp3806-%e3%80%90%e6%a8%a1%e6%9d%bf%e3%80%91%e7%82%b9%e5%88%86%e6%b2%bb1","status":"publish","type":"post","link":"http:\/\/SmokeyDays.top\/wordpress\/2019\/03\/27\/lp3806-%e3%80%90%e6%a8%a1%e6%9d%bf%e3%80%91%e7%82%b9%e5%88%86%e6%b2%bb1\/","title":{"rendered":"lp3806 \u3010\u6a21\u677f\u3011\u70b9\u5206\u6cbb1"},"content":{"rendered":"\n<p>\u70b9\u5206\u6cbb\u662f\u4e00\u79cd\u5e38\u5e38\u7528\u4e8e\u5904\u7406\u6811\u4e0a\u8def\u5f84\u7edf\u8ba1\u95ee\u9898\u7684\u7b97\u6cd5\u3002<br>\n\u9996\u5148\u6211\u4eec\u53ef\u4ee5\u60f3\u5230\u8fd9\u4e00\u9898\u7684\u4e00\u79cd\u7b80\u5355\u7684\u5206\u6cbb\u505a\u6cd5\uff1a\u627e\u5230\u4e00\u4e2a\u70b9\uff0c\u4ece\u5b83\u5f00\u59cb\u641c\uff0c\u6c42\u51fa\u5b83\u7684\u6bcf\u4e00\u79cd\u957f\u5ea6\u3002\u7136\u540e\u641c\u5b83\u7684\u6bcf\u4e00\u4e2a\u5b50\u6811\uff0c\u627e\u5230\u8fd9\u4e9b\u5b50\u6811\u7684\u6839\uff0c\u6c42\u51fa\u5b83\u4eec\u7684\u6bcf\u4e00\u79cd\u957f\u5ea6\u5e76\u7edf\u8ba1\u7b54\u6848\u3002<br>\n\u4e0b\u9762\u7684\u95ee\u9898\u4fbf\u662f\u8981\u5982\u4f55\u7edf\u8ba1\u7b54\u6848\u3002\u5bb9\u6613\u60f3\u5230\u7684\u4e00\u79cd\u65b9\u6848\u662f\u679a\u4e3e\u4ee5\u67d0\u4e2a\u70b9\u4e3a\u6839\u7684\u94fe\u957f\u4e24\u4e24\u76f8\u52a0\u5f97\u5230\u7684\u957f\u5ea6\u518d\u5bb9\u65a5\u6389\u91cd\u590d\u7ecf\u8fc7\u67d0\u4e00\u6761\u8fb9\u7684\u8def\u5f84\uff0c\u4e5f\u5c31\u662f\u6240\u6709\u7ecf\u8fc7\u5b83\u7684\u540c\u4e00\u4e2a\u5b50\u8282\u70b9\u7684\u94fe\u5bf9\u3002<br>\n\u7136\u800c\u4ed4\u7ec6\u60f3\u60f3\u8fd9\u79cd\u505a\u6cd5\u7684\u590d\u6742\u5ea6\u662f\u6709\u95ee\u9898\u7684\u3002\u5728\u83ca\u82b1\u56fe\u4e0a\uff0c\u5b83\u751a\u81f3\u4f1a\u8fbe\u5230\\(n^2\\)\u7684\u590d\u6742\u5ea6\u3002\u6545\u800c\u6211\u4eec\u5fc5\u987b\u53e6\u5916\u8003\u8651\u5176\u4ed6\u505a\u6cd5\u3002<br>\n\u4ed4\u7ec6\u89c2\u5bdf\u6570\u636e\u8303\u56f4\uff0c\u6211\u4eec\u53d1\u73b0\u8be2\u95ee\u4e2a\u6570\u4e0d\u8d85\u8fc7100\uff0c\u8fd9\u542f\u53d1\u6211\u4eec\u8003\u8651\u4e00\u79cd\\(O(nmlogn)\\)\u7684\u505a\u6cd5\u3002<br>\n\u5f53\u6211\u4eec\u6c42\u51fa\u4ee5\u67d0\u4e2a\u8282\u70b9\u4e3a\u6839\u4e14\u7ecf\u8fc7\u524d\\(i\\)\u4e2a\u5b50\u8282\u70b9\u7684\u6240\u6709\u94fe\u4ee5\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u6807\u8bb0\u8fd9\u8fd9\u4e9b\u957f\u5ea6\u7684\u5b58\u5728\u6027\uff0c\u7136\u540e\u641c\u7d22\u7ecf\u8fc7\u7b2c\\(i+1\\)\u4e2a\u5b50\u8282\u70b9\u7684\u6240\u6709\u94fe\uff0c\u5e76\u679a\u4e3e\u5224\u65ad\u8be2\u95ee\u7684\u957f\u5ea6\u51cf\u53bb\u8fd9\u4e2a\u94fe\u7684\u957f\u5ea6\u5269\u4e0b\u7684\u957f\u5ea6\u662f\u5426\u5b58\u5728\u3002<br>\n\u8fd9\u5c31\u505a\u5b8c\u4e86\u3002<\/p>\n\n\n\n<p>\u53e6\uff1a\u8fd9\u9898\u7684\u6570\u636e\u662f\u771f\u7684\u6c34\u3002\u6211\u72af\u4e86\u4e24\u4e2a\u9519\uff0c\u4e00\u4e2a\u662f\u6ca1\u91cd\u8bbe\u4e3a\u5c40\u90e8\u5927\u5c0f\uff0c\u4e00\u4e2a\u662f\u627e\u91cd\u5fc3\u5199\u6302\u4e86\uff0c\u800c\u4e14\u7528\u7684\u8fd8\u662f\u590d\u6742\u5ea6\u9519\u7684\u7b97\u6cd5\uff0c\u5c45\u7136\u8fd8\u8fc7\u4e86\u2026<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include&lt;iostream>\n#include&lt;cstdio>\n\n#define Fv(i,X) for(int i=h[X];i;i=e[i].nxt) \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[20005];\nint h[10005],et=0;\ninline void Eadd(int U,int V,int W){\n\te[++et]=(ee){V,W,h[U]};\n\th[U]=et;\n}\ninline void add(int U,int V,int W){\n\tEadd(U,V,W);Eadd(V,U,W);\n}\nint ans[10005]; \n\nint n,m,rt,s;\n\nint mx[10005],sz[10005],vis[10005];\ninline void dfs0(int X,int FA){\n\tsz[X]=1,mx[X]=0;\n\tFv(i,X){\n\t\tif(e[i].v==FA||vis[e[i].v]){\n\t\t\tcontinue;\n\t\t}\n\t\tdfs0(e[i].v,X);\n\t\tsz[X]+=sz[e[i].v];\n\t\tmx[X]=Max(mx[X],sz[e[i].v]);\n\t}\n\tmx[X]=Max(mx[X],s-sz[X]);\n\tif(mx[X]&lt;mx[rt]){\n\t\trt=X;\n\t}\n}\nint a[10005];\nint dis[10005],tp=0;\ninline void dfs2(int X,int FA){\n\tdis[++tp]=a[X];\n\tFv(i,X){\n\t\tif(e[i].v==FA||vis[e[i].v]){\n\t\t\tcontinue;\n\t\t}\n\t\ta[e[i].v]=a[X]+e[i].w;\n\t\tdfs2(e[i].v,X);\n\t}\n}\nint exist[10000005],lst[10005],cnt=0,qry[10005];\ninline void calc(int X){\n\tcnt=0;\n\tFv(i,X){\n\t\tif(vis[e[i].v]){\n\t\t\tcontinue;\n\t\t}\n\t\ta[e[i].v]=e[i].w;\n\t\ttp=0;\n\t\tdfs2(e[i].v,X);\n\t\tfor(int j=1;j&lt;=m;++j){\n\t\t\tfor(int k=1;k&lt;=tp;++k){\n\t\t\t\t(qry[j]-dis[k]>=0)?ans[j]|=exist[qry[j]-dis[k]]:0; \n\t\t\t}\n\t\t}\n\t\tfor(int j=1;j&lt;=tp;++j){\n\t\t\tlst[++cnt]=dis[j];\n\t\t\texist[dis[j]]=1;\n\t\t}\n\t}\n\tfor(int i=1;i&lt;=cnt;++i){\n\t\texist[lst[i]]=0;\n\t}\n}\n\ninline void dfs1(int X){\n\texist[0]=vis[X]=1;\n\tcalc(X);\n\tFv(i,X){\n\t\tif(vis[e[i].v]){\n\t\t\tcontinue;\n\t\t}\n\t\ts=sz[X],rt=0;\/\/\u8bb0\u5f97\u91cd\u7f6e\u6839\u3002 \n\t\tdfs0(e[i].v,X);\n\t\tdfs1(rt);\n\t}\n}\n\nvoid init(){\n\tscanf(\"%d%d\",&amp;n,&amp;m);\n\tint u,v,w,x;\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}\n\tfor(int i=1;i&lt;=m;++i){\n\t\tscanf(\"%d\",&amp;x);\n\t\tqry[i]=x;\n\t}\n\ts=n,mx[0]=n,rt=0;\n\tdfs0(1,0);\n\tdfs1(rt);\n\tfor(int i=1;i&lt;=m;++i){\n\t\tputs(ans[i]?\"AYE\":\"NAY\");\n\t}\n} \n\nint main(){\n\tinit();\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u70b9\u5206\u6cbb\u662f\u4e00\u79cd\u5e38\u5e38\u7528\u4e8e\u5904\u7406\u6811\u4e0a\u8def\u5f84\u7edf\u8ba1\u95ee\u9898\u7684\u7b97\u6cd5\u3002 \u9996\u5148\u6211\u4eec\u53ef\u4ee5\u60f3\u5230\u8fd9\u4e00\u9898\u7684\u4e00\u79cd\u7b80\u5355\u7684\u5206\u6cbb\u505a\u6cd5\uff1a\u627e\u5230\u4e00\u4e2a\u70b9\uff0c\u4ece\u5b83 &hellip; 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