{"id":218,"date":"2012-10-27T21:06:00","date_gmt":"2012-10-27T13:06:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/123"},"modified":"2012-10-27T21:06:00","modified_gmt":"2012-10-27T13:06:00","slug":"cf_237e_letter_select_-_cost_flow","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=218","title":{"rendered":"CF 237E(\u5b57\u6bcd\u9009\u53d6-\u8d39\u7528\u6d41\uff09"},"content":{"rendered":"

\u9898\u76ee\u5927\u610f\uff1a\u6709\u4e00\u5b57\u7b26\u4e32S\uff0c\u4f60\u9700\u8981\u4ecen\u4e2a\u5b57\u7b26\u4e32\u4e2d\u9009\u53d6\u4e00\u4e9b\u6765\u62fc\u51fa\u8fd9\u4e2a\u4e32\uff0c\u7b2ci\u4e2a\u5b57\u7b26\u4e32\u4ee3\u4ef7\u4e3ai\uff0c\u9650\u5236\u53d6P\u6b21\uff0c\u95ee\u6700\u5c0f\u4ee3\u4ef7\uff08\u65e0\u89e3\u8f93\u51fa-1)<\/p>\n

\n<\/p>\n

\u5efa\u7acb\u8d85\u6e90S=0\uff0c\u8d85\u6c47T=n+26+1 <\/p>\n

1-n\u7684\u7ed3\u70b9\u4e3a\u5b57\u7b26\u4e32 n+1-n+26\u7684\u7ed3\u70b9\u4e3a\u5b57\u7b26<\/p>\n

\u5219\u53ef\u5f97\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/p>\n

\u4eceS\u5411\u5b57\u7b26\u4e32\u8fde\uff08\u6700\u591a\u53ef\u53d6\u6570\u91cf\uff09\uff0c\u8d39\u7528\u4e3ai<\/p>\n

\u4ece\u5b57\u7b26\u5411T\u8fde\uff08\u6b32\u53d6\u6570\u91cf\uff09<\/p>\n

\u4ece\u5b57\u7b26\u4e32\u5411\u5b57\u7b26\u8fde\uff08\u5b57\u7b26\u4e32\u53ef\u53d6\u8be5\u5b57\u6bcd\u7684\u6570\u91cf\uff09<\/p>\n

\u5f97\u5230\u56fe<\/p>\n

\u8dd1\u8d39\u7528\u2026\u2026<\/p>\n

\n<\/p>\n

\uff01\u8d1f\u6570\u7684\u5e03\u5c14值\u4e3a1.<\/p>\n

\n<\/p>\n

#include<cstdio>\n#include<cstring>\n#include<cstdlib>\n#include<cmath>\n#include<string>\n#include<algorithm>\n#include<functional>\n#include<iostream>\nusing namespace std;\n#define MAXN (200+10)\n#define M26 100\n#define A 96\n#define NONE (2139062143)\nint map[MAXN][MAXN]={0},cost[MAXN][MAXN]={0},stf[M26]={0};\nint start=0,end,n;\nchar s[5000];\n\nint d[MAXN],pre[MAXN],q[MAXN*8];\nbool b[MAXN];\nvoid spfa()\n{\n\tmemset(b,0,sizeof(b));\n\tmemset(d,127,sizeof(d));\n\tmemset(q,0,sizeof(q));\n\tmemset(pre,0,sizeof(pre));\n\n\tint head=1,tail=1;\n\tq[1]=start;b[start]=1;d[start]=0;\n\twhile (head<=tail)\n\t{\n\t\tint now=q[head];\n\t\tfor (int i=0;i<=end;i++)\n\t\tif (map[now][i]>0&&d[now]+cost[now][i]<d[i])\n\t\t{\n\t\t\td[i]=d[now]+cost[now][i];\n\t\t\tpre[i]=now;\n\t\t\tif (!b[i])\n\t\t\t{\n\t\t\t\tq[++tail]=i;\n\t\t\t\tb[i]=1;\n\t\t\t}\n\n\t\t}\n\n\t\tb[now]=0;\n\t\thead++;\n\t}\n\n\n\n}\nvoid hllp()\n{\n\tint totalcost=0;\n\twhile (1)\n\t{\n\t\tspfa();\n\t\tif (d[end]==NONE) break;\n\t\tint flow=NONE,i=end;\n\t\tdo\n\t\t{\n\t\t\tflow=min(flow,map[pre[i]][i]);\n\t\t\ti=pre[i];\n\t\t}while (i!=start);\n\t\ti=end;\n\t\tdo\n\t\t{\n\t\t\ttotalcost+=flow*cost[pre[i]][i];\n\t\t\tmap[pre[i]][i]-=flow;\n\t\t\tmap[i][pre[i]]+=flow;\n\t\t\ti=pre[i];\n\t\t}while (i!=start);\n\n\t}\n\tfor (int i=end-27;i<end;i++)\n\tif (map[i][end])\n\t{\n\t\tcout<<"-1n";\n\t\treturn;\n\n\t}\n\tcout<<totalcost<<endl;\n}\n\n\n\nint main()\n{\n\/\/\tfreopen("c.in","r",stdin);\n\tscanf("%s",s);\n\tscanf("%d",&n);\n\tint len=strlen(s);\n\tfor (int i=0;i<len;i++) stf[s[i]-A]++;\n\tend=n+27;\n\tfor (int i=1;i<=26;i++) map[n+i][end]=stf[i];\n\tfor (int i=1;i<=n;i++)\n\t{\n\t\tscanf("%s",s);\n\t\tscanf("%d",&map[start][i]);\n\t\tmemset(stf,0,sizeof(stf));\n\t\tfor (int j=0;j<strlen(s);j++) stf[s[j]-A]++;\n\t\tfor (int j=1;j<=26;j++) map[i][n+j]=stf[j];\n\t\tcost[0][i]=i;\n\t\tcost[i][0]=-cost[0][i];\n\t}\n\/*\tfor (int i=0;i<=end;i++)\n\t\tfor (int j=0;j<=end;j++)\n\t\t\tif (map[i][j]) cout<<i<<' '<<j<<' '<<map[i][j]<<endl;\n*\/\thllp();\n\tcout<<'n';\n\/*\tfor (int i=0;i<=end;i++)\n\t\tfor (int j=0;j<=end;j++)\n\t\t\tif (map[i][j]) cout<<i<<' '<<j<<' '<<map[i][j]<<endl;\n*\/\n\treturn 0;\n}<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"
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