http://code.google.com/codejam/contest/dashboard?c=1128486#s=p0

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      #include
    
      <
    
      iostream
    
      >
    
      

    
      char
    
       ch[
    
      51
    
      ][
    
      51
    
      ];

    
      using
    
       
    
      namespace
    
       std;

    
      int
    
       main()
{
 
    
      int
    
       t;
 
    
      int
    
       n , m , k
    
      =
    
      0
    
       ;
 
    
      int
    
       i,j;
 cin
    
      >>
    
      t;
 
    
      while
    
      (t
    
      --
    
      )
 {
 cin
    
      >>
    
      n
    
      >>
    
      m;
 
 
    
      for
    
      (i
    
      =
    
      0
    
      ;i
    
      <
    
      n; i
    
      ++
    
      ) cin
    
      >>
    
      ch[i];
 
 
    
      int
    
       j , i , sign 
    
      =
    
       
    
      0
    
       ;
 
    
      int
    
       ans
    
      =
    
      0
    
      ;
 
    
      for
    
      ( i 
    
      =
    
       
    
      0
    
       ; i 
    
      <
    
       n ; i
    
      ++
    
       )
 {
 
    
      for
    
      ( j 
    
      =
    
       
    
      0
    
       ; j 
    
      <
    
       m ; j
    
      ++
    
       )
 {
 
    
      if
    
      ( ch[i][j]
    
      !=
    
      '
    
      /
    
      '
    
       
    
      &&
    
       ch[i][j]
    
      !=
    
      '
    
      \\
    
      '
    
       
    
      &&
    
       ch[i][j]
    
      !=
    
      '
    
      .
    
      '
    
       )
 {
 
    
      if
    
      (ch[i][j
    
      +
    
      1
    
      ]
    
      ==
    
      '
    
      #
    
      '
    
       
    
      &&
    
       ch[i
    
      +
    
      1
    
      ][j]
    
      ==
    
      '
    
      #
    
      '
    
       
    
      &&
    
       ch[i
    
      +
    
      1
    
      ][j
    
      +
    
      1
    
      ]
    
      ==
    
      '
    
      #
    
      '
    
      ) 
 {
 ch[i][j]
    
      =
    
      '
    
      /
    
      '
    
      ;
 ch[i
    
      +
    
      1
    
      ][j]
    
      =
    
      '
    
      \\
    
      '
    
      ;
 ch[i][j
    
      +
    
      1
    
      ]
    
      =
    
      '
    
      \\
    
      '
    
      ;
 ch[i
    
      +
    
      1
    
      ][j
    
      +
    
      1
    
      ]
    
      =
    
      '
    
      /
    
      '
    
      ;
 
 }
 
    
      else
    
       { sign
    
      =
    
      1
    
      ; 
    
      break
    
      ;}
 
 }
 }
 
    
      if
    
      (sign
    
      ==
    
      1
    
      ) 
    
      break
    
      ;
 }
 
    
      for
    
      (i
    
      =
    
      0
    
      ;i
    
      <
    
      n;i
    
      ++
    
      )
 {
 
    
      for
    
      (j
    
      =
    
      0
    
      ;j
    
      <
    
      m;j
    
      ++
    
      )
 
    
      if
    
      (ch[i][j] 
    
      ==
    
       
    
      '
    
      #
    
      '
    
      ){ ans
    
      =
    
      1
    
      ; 
    
      break
    
      ;}
 
 }
 cout
    
      <<
    
      "
    
      Case #
    
      "
    
      <<++
    
      k
    
      <<
    
      "
    
      :
    
      "
    
      <<
    
      endl;
 
 
    
      if
    
      (ans
    
      ==
    
      1
    
      ) cout
    
      <<
    
      "
    
      Impossible
    
      "
    
      <<
    
      endl;
 
    
      else
    
      
 {
 
    
      for
    
      (i
    
      =
    
      0
    
      ;i
    
      <
    
      n;i
    
      ++
    
      )
 cout
    
      <<
    
      ch[i]
    
      <<
    
      endl;
 }
 
 }
 
    
      return
    
       
    
      0
    
      ;
}