public static void main ( String args [ ] ) {
  Scanner s = new Scanner ( System . in ) ;
  int n = s . nextInt ( ) ;
  char arr [ ] [ ] = new char [ n ] [ n ] ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String str = s . next ( ) ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      arr [ i ] [ j ] = str . charAt ( j ) ;
      if ( arr [ i ] [ j ] == '#' ) {
        count ++ ;
      }
    }
  }
  if ( count % 5 > 0 ) {
    System . out . println ( "NO" ) ;
    return ;
  }
  for ( int i = 1 ;
  i < n - 1 ;
  i ++ ) {
    for ( int j = 1 ;
    j < n - 1 ;
    j ++ ) {
      if ( arr [ i ] [ j ] == '#' ) {
        if ( arr [ i - 1 ] [ j ] == '#' && arr [ i ] [ j + 1 ] == '#' && arr [ i + 1 ] [ j ] == '#' && arr [ i ] [ j - 1 ] == '#' ) {
          arr [ i ] [ j ] = '.' ;
          arr [ i - 1 ] [ j ] = '.' ;
          arr [ i ] [ j + 1 ] = '.' ;
          arr [ i ] [ j - 1 ] = '.' ;
          arr [ i + 1 ] [ j ] = '.' ;
        }
      }
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( arr [ i ] [ j ] == '#' ) {
        System . out . println ( "NO" ) ;
        return ;
      }
    }
  }
  System . out . println ( "YES" ) ;
}

public static void main ( String args [ ] ) { Scanner s = new Scanner ( System . in ) ; int n = s . nextInt ( ) ; char arr [ ] [ ] = new char [ n ] [ n ] ; int count = 0 ; for ( int i = 0 ; i < n ; i ++ ) { String str = s . next ( ) ; for ( int j = 0 ; j < n ; j ++ ) { arr [ i ] [ j ] = str . charAt ( j ) ; if ( arr [ i ] [ j ] == ' # ' ) { count ++ ; } } } if ( count % 5 > 0 ) { System . out . println ( " NO " ) ; return ; } for ( int i = 1 ; i < n - 1 ; i ++ ) { for ( int j = 1 ; j < n - 1 ; j ++ ) { if ( arr [ i ] [ j ] == ' # ' ) { if ( arr [ i - 1 ] [ j ] == ' # ' && arr [ i ] [ j + 1 ] == ' # ' && arr [ i + 1 ] [ j ] == ' # ' && arr [ i ] [ j - 1 ] == ' # ' ) { arr [ i ] [ j ] = ' . ' ; arr [ i - 1 ] [ j ] = ' . ' ; arr [ i ] [ j + 1 ] = ' . ' ; arr [ i ] [ j - 1 ] = ' . ' ; arr [ i + 1 ] [ j ] = ' . ' ; } } } } for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { if ( arr [ i ] [ j ] == ' # ' ) { System . out . println ( " NO " ) ; return ; } } } System . out . println ( " YES " ) ; }
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right: (character_literal)) right: (binary_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (character_literal))) right: (binary_expression left: (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (identifier)) right: (character_literal))) right: (binary_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (character_literal)))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (character_literal))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (identifier)) right: (character_literal))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (character_literal))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (character_literal))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (identifier)) right: (character_literal))))))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (character_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))))