public static void input ( ) {
  Scanner scan = new Scanner ( System . in ) ;
  H = scan . nextInt ( ) ;
  W = scan . nextInt ( ) ;
  C = new int [ H ] [ W ] ;
  for ( int i = 0 ;
  i < H ;
  i ++ ) {
    for ( int j = 0 ;
    j < W ;
    j ++ ) {
      int x = scan . nextInt ( ) ;
      if ( ( i + j ) % 2 == 0 ) C [ i ] [ j ] = x ;
      else C [ i ] [ j ] = - x ;
    }
  }
}

public static void input ( ) { Scanner scan = new Scanner ( System . in ) ; H = scan . nextInt ( ) ; W = scan . nextInt ( ) ; C = new int [ H ] [ W ] ; for ( int i = 0 ; i < H ; i ++ ) { for ( int j = 0 ; j < W ; j ++ ) { int x = scan . nextInt ( ) ; if ( ( i + j ) % 2 == 0 ) C [ i ] [ j ] = x ; else C [ i ] [ j ] = - x ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters) 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)))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (identifier))) alternative: (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (unary_expression operand: (identifier)))))))))))