poj3080

枚举第一串的所有子串，看其他串是否也有

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      #include 
    
      <
    
      iostream
    
      >
    
      
#include 
    
      <
    
      cstdlib
    
      >
    
      
#include 
    
      <
    
      cstring
    
      >
    
      
#include 
    
      <
    
      cstdio
    
      >
    
      

    
      using
    
       
    
      namespace
    
       std;


    
      #define
    
       maxn 11
    
      


    
      string
    
       st[maxn];

    
      int
    
       n;


    
      void
    
       input()
{
 scanf(
    
      "
    
      %d
    
      "
    
      , 
    
      &
    
      n);
 getchar();
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      0
    
      ; i 
    
      <
    
       n; i
    
      ++
    
      )
 getline(cin, st[i]);
}


    
      void
    
       work()
{
 
    
      string
    
       ans 
    
      =
    
       
    
      ""
    
      ;
 
    
      for
    
       (
    
      int
    
       j 
    
      =
    
       st[
    
      0
    
      ].length(); j 
    
      >=
    
       
    
      3
    
      ; j
    
      --
    
      )
 {
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      0
    
      ; i 
    
      +
    
       j 
    
      -
    
       
    
      1
    
       
    
      <
    
       st[
    
      0
    
      ].length(); i
    
      ++
    
      )
 {
 
    
      string
    
       temp 
    
      =
    
       st[
    
      0
    
      ].substr(i, j);
 
    
      bool
    
       ok 
    
      =
    
       
    
      true
    
      ;
 
    
      for
    
       (
    
      int
    
       k 
    
      =
    
       
    
      1
    
      ; k 
    
      <
    
       n; k
    
      ++
    
      )
 
    
      if
    
       (st[k].find(temp) 
    
      ==
    
       
    
      string
    
      ::npos)
 {
 ok 
    
      =
    
       
    
      false
    
      ;
 
    
      break
    
      ;
 }
 
    
      if
    
       (ok 
    
      &&
    
       (ans 
    
      ==
    
       
    
      ""
    
       
    
      ||
    
       ans 
    
      >
    
       temp))
 ans 
    
      =
    
       temp;
 }
 
    
      if
    
       (ans 
    
      !=
    
       
    
      ""
    
      )
 {
 cout 
    
      <<
    
       ans 
    
      <<
    
       endl;
 
    
      return
    
      ;
 }
 }
 printf(
    
      "
    
      no significant commonalities\n
    
      "
    
      );
}


    
      int
    
       main()
{
 
    
      //
    
      freopen("D:\\t.txt", "r", stdin);
    
      

    
       
    
      int
    
       t;
 scanf(
    
      "
    
      %d
    
      "
    
      , 
    
      &
    
      t);
 
    
      while
    
       (t
    
      --
    
      )
 {
 input();
 work();
 }
 
    
      return
    
       
    
      0
    
      ;
}