{"id":539,"date":"2018-12-30T13:35:17","date_gmt":"2018-12-30T05:35:17","guid":{"rendered":"http:\/\/SmokeyDays.top\/wordpress\/?p=539"},"modified":"2018-12-30T13:35:17","modified_gmt":"2018-12-30T05:35:17","slug":"lp3355-%e7%bd%91%e7%bb%9c%e6%b5%8124%e9%a2%98-%e9%aa%91%e5%a3%ab%e5%85%b1%e5%ad%98%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/SmokeyDays.top\/wordpress\/2018\/12\/30\/lp3355-%e7%bd%91%e7%bb%9c%e6%b5%8124%e9%a2%98-%e9%aa%91%e5%a3%ab%e5%85%b1%e5%ad%98%e9%97%ae%e9%a2%98\/","title":{"rendered":"lp3355 \u7f51\u7edc\u6d4124\u9898-\u9a91\u58eb\u5171\u5b58\u95ee\u9898"},"content":{"rendered":"\n

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#include<iostream>\n#include<cstdio>\n\nconst int dx[8]={-2,-1,1,2,-2,-1,1,2};\nconst int dy[8]={1,2,2,1,-1,-2,-2,-1}; \n\nstruct ee{\n\tint v;\n\tint nxt;\n}e[160005];\nint h[40005],et=0;\n\ninline void add(int U,int V){\n\te[++et]=(ee){V,h[U]};\n\th[U]=et; \n}\n\nbool vis[40005],mp[205][205];\nint n=0,m=0,usd[40005];\n\ninline int calc(int X,int Y){\n\treturn (X-1)*n+Y;\n\/\/\t\u6ce8\u610f\u5750\u6807\u54c8\u5e0c\u6210\u6570\u5b57\u7684\u65b9\u5f0f\u3002 \n}\n\ninline bool dfs(int X){\n\tfor(int i=h[X];i;i=e[i].nxt){\n\t\tif(!vis[e[i].v]){\n\t\t\tvis[e[i].v]=1;\n\t\t\tif(!usd[e[i].v]||dfs(usd[e[i].v])){\n\t\t\t\tusd[e[i].v]=X;\n\t\t\t\treturn 1;\n\t\t\t}\n\t\t}\n\t}\n\treturn 0;\n}\nint st[40005],tp=0;\nchar out[205][205];\nvoid init(){\n\tscanf(\"%d%d\",&n,&m);\n\tfor(int i=1;i<=n;++i){\n\t\tfor(int j=1;j<=n;++j){\n\t\t\tmp[i][j]=0;\n\t\t\tusd[calc(i,j)]=0;\n\t\t\tout[i][j]='O';\n\t\t}\n\t}\n\tint x,y;\n\tfor(int i=1;i<=m;++i){\n\t\tscanf(\"%d%d\",&x,&y);\n\t\tmp[x][y]=1;\n\t}\n\tfor(int i=1;i<=n;++i){\n\t\tfor(int j=1;j<=n;++j){\n\/\/\t\t\tprintf(\"[%d %d] \",i,j);\n\t\t\tif(mp[i][j]||((i+j)&1)){\n\/\/\t\t\t\t\u6ce8\u610f\u4e0d\u662f\u6bcf\u6b21\u8df32\u800c\u662f\u5224\u5947\u5076\u6027\u3002 \n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\tst[++tp]=calc(i,j);\n\t\t\tout[i][j]='@'; \n\t\t\t\/\/\u6ce8\u610f\u6709\u969c\u788d\u7684\u4e0d\u4ec5\u662f\u7ed3\u675f\u70b9\uff0c\u8fd8\u6709\u51fa\u53d1\u70b9\u3002 \n\t\t\tfor(int k=0;k<8;++k){\n\t\t\t\tx=i+dx[k],y=j+dy[k];\n\t\t\t\tif(x<=0||y<=0||x>n||y>n||mp[x][y]){\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t\tout[x][y]='X';\n\t\t\t\tadd(calc(i,j),calc(x,y));\n\t\t\t}\n\t\t}\n\t}\n\/\/\tfor(int i=1;i<=n;++i){\n\/\/\t\tfor(int j=1;j<=n;++j){\n\/\/\t\t\tputchar(out[i][j]);\n\/\/\t\t}\n\/\/\t\tputs(\"\");\n\/\/\t}\n\tint ans=n*n-m;\n\/\/\t\u51cf\u53bb\u88ab\u6316\u6389\u7684\u70b9 \n\tfor(int i=1;i<=tp;++i){\n\t\tfor(int j=1;j<=n*n;++j){\n\t\t\tvis[j]=0;\n\t\t}\n\t\tans-=dfs(st[i]);\n\t}\n\tprintf(\"%d\\n\",ans);\n}\n\nint main(){\n\tinit();\n\treturn 0;\n} <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148\u6211\u4eec\u89c2\u5bdf\u8fd9\u9053\u9898\u3002 \u66b4\u529b\u5730\u72b6\u538bDP\u6216\u8005\u4e4b\u7c7b\u7684\u64cd\u4f5c\u663e\u7136\u4f1aMLE\/TLE\u3002 \u6211\u4eec\u53d1\u73b0\uff0c\u6a2a\u5750\u6807\u548c\u7eb5\u5750\u6807\u76f8\u52a0\u7684\u548c\u7684\u5947 … <\/p>\n
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