{"id":551,"date":"2018-12-31T23:48:08","date_gmt":"2018-12-31T15:48:08","guid":{"rendered":"http:\/\/SmokeyDays.top\/wordpress\/?p=551"},"modified":"2018-12-31T23:48:08","modified_gmt":"2018-12-31T15:48:08","slug":"lp2764-%e7%bd%91%e7%bb%9c%e6%b5%8124%e9%a2%98-%e6%9c%80%e5%b0%8f%e8%b7%af%e5%be%84%e8%a6%86%e7%9b%96%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/SmokeyDays.top\/wordpress\/2018\/12\/31\/lp2764-%e7%bd%91%e7%bb%9c%e6%b5%8124%e9%a2%98-%e6%9c%80%e5%b0%8f%e8%b7%af%e5%be%84%e8%a6%86%e7%9b%96%e9%97%ae%e9%a2%98\/","title":{"rendered":"lp2764 \u7f51\u7edc\u6d4124\u9898-\u6700\u5c0f\u8def\u5f84\u8986\u76d6\u95ee\u9898"},"content":{"rendered":"\n
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#include<iostream>\n#include<cstdio>\n#include<queue>\nconst int INF=0x3f3f3f3f;\n\ninline int Min(int A,int B){\n\treturn A<B?A:B;\n}\n\nstruct ee{\n\tint v;\n\tint w;\n\tint nxt;\n}e[20005];\nint h[2005],et=-1;\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);\n\tEadd(V,U,0);\n}\nint dep[2005],nw[2005],f[2005];\nint n,m,s,t;\n\nstd::queue<int> q;\ninline bool bfs(){\n\tfor(int i=1;i<=t;++i){\n\t\tdep[i]=INF;\n\t\tnw[i]=h[i];\n\t}\n\twhile(!q.empty()){\n\t\tq.pop();\n\t}\n\tdep[s]=0;\n\tq.push(s);\n\tint p;\n\twhile(!q.empty()){\n\t\tp=q.front();\n\t\tq.pop();\n\t\tfor(int i=h[p];i>=0;i=e[i].nxt){\n\t\t\tif(dep[e[i].v]==INF&&e[i].w){\n\t\t\t\tdep[e[i].v]=dep[p]+1;\n\t\t\t\tq.push(e[i].v);\n\t\t\t}\n\t\t}\n\t}\n\treturn dep[t]<INF;\n}\ninline int dfs(int X,int V){\n\tif(V<=0||X==t){\n\t\treturn V;\n\t}\n\tint cnt=0,val;\n\tfor(int i=nw[X];i>=0;i=e[i].nxt){\n\t\tnw[X]=i; \n\t\tif(dep[e[i].v]==dep[X]+1){\n\t\t\tval=dfs(e[i].v,Min(e[i].w,V));\n\t\t\tif(val){\n\t\t\t\tcnt+=val;\n\t\t\t\tV-=val;\n\t\t\t\te[i].w-=val;\n\t\t\t\te[i^1].w+=val;\n\t\t\t\tif(V<=0){\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\treturn cnt;\n}\n\ninline int fnd(int X){\n\tfor(int i=h[X+n];i>=0;i=e[i].nxt){\n\t\tif(1<=e[i].v&&e[i].v<=n){\n\t\t\tif(e[i].w){\n\t\t\t\treturn e[i].v;\n\t\t\t}\n\t\t}\n\t}\n\treturn X;\n}\ninline int fa(int X){\n\treturn f[X]^X?f[X]=fa(f[X]):X;\n}\ninline void prnt(int X){\n\tfor(int i=h[X];i>=0;i=e[i].nxt){\n\t\tif((n+1)<=e[i].v&&e[i].v<=(n<<1)&&!e[i].w){\n\t\t\tprintf(\"%d \",e[i].v-n\n\t\t\t);\n\t\t\tprnt(e[i].v-n);\n\t\t\treturn;\n\t\t}\n\t}\n}\nbool vis[2005];\nvoid init(){\n\tscanf(\"%d%d\",&n,&m);\n\ts=(n<<1)+1,t=(n<<1)+2;\n\tfor(int i=1;i<=t;++i){\n\t\th[i]=-1;\n\t}\n\tint u,v;\n\tfor(int i=1;i<=n;++i){\n\t\tadd(s,i,1);\n\t\tadd(n+i,t,1);\n\t}\n\tfor(int i=1;i<=m;++i){\n\t\tscanf(\"%d%d\",&u,&v);\n\t\tadd(u,n+v,1);\n\t}\n\tint ans=n;\n\twhile(bfs()){\n\t\tans-=dfs(s,INF);\n\t}\n\tfor(int i=1;i<=n;++i){\n\t\tf[i]=i;\n\t}\n\tfor(int i=1;i<=n;++i){\n\t\tf[i]=fnd(i);\n\t}\n\tfor(int i=1;i<=n;++i){\n\t\tfa(i);\n\t}\n\tfor(int i=1;i<=n;++i){\n\t\tif(f[i]==i){\n\t\t\tprintf(\"%d \",i);\n\t\t\tprnt(i);\n\t\t\tputs(\"\");\n\t\t}\n\t}\n\tprintf(\"%d\\n\",ans); \n}\n\nint main(){\n\tinit();\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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