public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int T = in . nextInt ( ) ;
  for ( int t = 0 ;
  t < T ;
  t ++ ) {
    int R = in . nextInt ( ) ;
    int C = in . nextInt ( ) ;
    int [ ] [ ] A = new int [ R ] [ C ] ;
    for ( int r = 0 ;
    r < R ;
    r ++ ) {
      for ( int c = 0 ;
      c < C ;
      c ++ ) {
        A [ r ] [ c ] = in . nextInt ( ) ;
      }
    }
    long answer = 0 ;
    for ( int r = 0 ;
    r < R ;
    r ++ ) {
      for ( int c = 0 ;
      c < C ;
      c ++ ) {
        int target = findTarget ( A [ r ] [ c ] , A [ R - 1 - r ] [ c ] , A [ r ] [ C - 1 - c ] , A [ R - 1 - r ] [ C - 1 - c ] ) ;
        answer += Math . abs ( target - A [ r ] [ c ] ) ;
        A [ r ] [ c ] = target ;
        answer += Math . abs ( target - A [ R - 1 - r ] [ c ] ) ;
        A [ R - 1 - r ] [ c ] = target ;
        answer += Math . abs ( target - A [ r ] [ C - 1 - c ] ) ;
        A [ r ] [ C - 1 - c ] = target ;
        answer += Math . abs ( target - A [ R - 1 - r ] [ C - 1 - c ] ) ;
        A [ R - 1 - r ] [ C - 1 - c ] = target ;
      }
    }
    System . out . println ( answer ) ;
  }
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int T = in . nextInt ( ) ; for ( int t = 0 ; t < T ; t ++ ) { int R = in . nextInt ( ) ; int C = in . nextInt ( ) ; int [ ] [ ] A = new int [ R ] [ C ] ; for ( int r = 0 ; r < R ; r ++ ) { for ( int c = 0 ; c < C ; c ++ ) { A [ r ] [ c ] = in . nextInt ( ) ; } } long answer = 0 ; for ( int r = 0 ; r < R ; r ++ ) { for ( int c = 0 ; c < C ; c ++ ) { int target = findTarget ( A [ r ] [ c ] , A [ R - 1 - r ] [ c ] , A [ r ] [ C - 1 - c ] , A [ R - 1 - r ] [ C - 1 - c ] ) ; answer += Math . abs ( target - A [ r ] [ c ] ) ; A [ r ] [ c ] = target ; answer += Math . abs ( target - A [ R - 1 - r ] [ c ] ) ; A [ R - 1 - r ] [ c ] = target ; answer += Math . abs ( target - A [ r ] [ C - 1 - c ] ) ; A [ r ] [ C - 1 - c ] = target ; answer += Math . abs ( target - A [ R - 1 - r ] [ C - 1 - c ] ) ; A [ R - 1 - r ] [ C - 1 - c ] = target ; } } System . out . println ( answer ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier)) dimensions: (dimensions_expr (identifier))))) (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 (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation name: (identifier) arguments: (argument_list (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) (array_access array: (array_access array: (identifier) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) index: (identifier)) (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) (array_access array: (array_access array: (identifier) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier))))))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (array_access array: (array_access array: (identifier) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) index: (identifier))))))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) index: (identifier)) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier)))))))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (array_access array: (array_access array: (identifier) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier)))))))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) index: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier))) right: (identifier))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))