{"id":267,"date":"2012-11-15T15:21:00","date_gmt":"2012-11-15T07:21:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/172"},"modified":"2012-11-15T15:21:00","modified_gmt":"2012-11-15T07:21:00","slug":"poj_1226_longest_common_substring_containing_reverse_order","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=267","title":{"rendered":"POJ 1226(\u6700\u957f\u516c\u5171\u5b50\u4e32\u542b\u9006\u5e8f\uff09"},"content":{"rendered":"\n\n\n
\n
Language:\n\n\n\n
Time Limit:<\/strong> 1000MS<\/td>\n <\/td>\nMemory Limit:<\/strong> 10000K<\/td>\n<\/tr>\n
Total Submissions:<\/strong> 9639<\/td>\n <\/td>\nAccepted:<\/strong> 3319<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\nDescription<\/p>\n

\n\u8bf7\u627e\u51fa\u4e00\u4e9b\u4e32\u7684\u6700\u957f\u2018\u6b63\/\u9006\u2018\u5b50\u4e32\uff0c\u4f7f\u5b83\u4e3a\u6240\u6709\u7684\u4e32\u7684\u5b50\u4e32\uff08\u5373\u4f7f\u662f\u9006\u5e8f\u4e5f\u8ba4\u4e3a\u5305\u542b\uff09.<\/div>\n

\nInput<\/p>\n

\n\u7b2c\u4e00\u884c\u4e3a\u6570\u636e\u6570t\uff0c(1 <= t <= 10),<\/div>\n
\n\u5bf9\u6bcf\u7ec4\u6570\u636e\u800c\u8a00:\u7b2c\u4e00\u884c\u4e3a\u5b57\u7b26\u4e32\u4e2a\u6570 n (1 <= n <= 100)\uff0c\u63a5\u4e0b\u6765n\u884c\u4e3a\u5b57\u7b26\u4e32\uff08\u957f\u5ea6\u4e0d\u8d85\u8fc7100\uff09 .<\/span><\/div>\n

\nOutput<\/p>\n

\n\u6bcf\u884c\u4e00\u4e2a\u6570\uff0c\u8868\u793a\u6700\u957f'\u6b63\/\u9006\u2018\u5b50\u4e32\u7684\u957f\u5ea6\u3002<\/div>\n

\nSample Input<\/p>\n

2\n3\nABCD\nBCDFF\nBRCD\n2\nrose\norchid<\/pre>\n
\nSample Output<\/p>\n
2\n2 <\/pre>\n
\nSource<\/p>\n
\nTehran 2002 Preliminary<\/a><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u8fd8\u662fKMP\uff0c\u5148\u5728\u7b2c\u4e00\u4e2a\u4e32\u4e2d\u679a\u4e3e\u4e32\uff0c\u4e4b\u540e\u8003\u5bdf\u5b83\u662f\u5426\u662f\u5176\u5b83\u4e32\u7684'\u6b63\/\u9006'\u5b50\u4e32\u3002<\/span><\/p>\n

\n<\/span><\/p>\n
<\/span><\/p>\n
Program P1226;\nconst\n   maxn=100;\n   maxt=10;\nvar\n   tt,n,m,i,j,k,ans:longint;\n   flag:boolean;\n   a:array[1..maxn] of string;\n   p:string;\n   next:array[1..maxn] of longint;\n\nfunction kmp(a,b:string):boolean;\nvar\n   i,j,n,m:longint;\nbegin\n   i:=1;j:=0;next[1]:=0;\n   n:=length(a); m:=length(b);\n   while (i<m) do\n   begin\n      if (j=0) or (b[i]=b[j]) then\n      begin\n         inc(i);inc(j);\n         if (b[i]<>b[j]) then next[i]:=j else next[i]:=next[j];\n      end else j:=next[j];\n   end;\n\n   i:=0;j:=0;\n   while (i<=n) and (j<=m) do\n   begin\n      if (j=0) or (a[i]=b[j]) then\n      begin\n         inc(i);inc(j);\n      end else j:=next[j];\n   end;\n   if (j>m) then exit(true);\n   exit(false);\nend;\nfunction ob_s(a:string):string;\nvar\n   i,j,n:longint;\nbegin\n\n   ob_s:=''; n:=length(a);\n   for i:=n downto 1 do ob_s:=ob_s+a[i];\nend;\nfunction compare(a,b:string):boolean;\nvar\n   n,m:longint;\nbegin\n   n:=length(a);m:=length(b);\n   if (n<>m) then exit(n<m);\n   for i:=1 to n do\n      if a[i]<>b[i] then exit(a[i]<b[i]);\n   exit(false);\nend;\n\n\nbegin\n   readln(tt);\n   while (tt>0) do\n   begin\n      ans:=0;\n      readln(n);\n      for i:=1 to n do readln(a[i]);\n\n      for i:=1 to length(a[1]) do\n         for j:=i to length(a[1]) do\n         begin\n            p:=copy(a[1],i,j-i+1);\n            flag:=true;\n            for k:=2 to n do\n            begin\n               if not((kmp(a[k],p) or kmp(a[k],ob_s(p)))) then\n               begin\n                  flag:=false; break;\n               end;\n            end;\n            if flag and (length(p)>ans) then ans:=length(p);\n\n\n         end;\n\n      writeln(ans);\n      dec(tt);\n   end;\nend.\n<\/pre>\n<\/p>\n

\n<\/span><\/p>\n
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