public static int minRemove ( int a [ ] , int b [ ] , int n , int m ) {
  HashMap < Integer , Integer > countA = new HashMap < Integer , Integer > ( ) ;
  HashMap < Integer , Integer > countB = new HashMap < Integer , Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( countA . containsKey ( a [ i ] ) ) countA . put ( a [ i ] , countA . get ( a [ i ] ) + 1 ) ;
    else countA . put ( a [ i ] , 1 ) ;
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    if ( countB . containsKey ( b [ i ] ) ) countB . put ( b [ i ] , countB . get ( b [ i ] ) + 1 ) ;
    else countB . put ( b [ i ] , 1 ) ;
  }
  int res = 0 ;
  Set < Integer > s = countA . keySet ( ) ;
  for ( int x : s ) if ( countB . containsKey ( x ) ) res += Math . min ( countB . get ( x ) , countA . get ( x ) ) ;
  return res ;
}

public static int minRemove ( int a [ ] , int b [ ] , int n , int m ) { HashMap < Integer , Integer > countA = new HashMap < Integer , Integer > ( ) ; HashMap < Integer , Integer > countB = new HashMap < Integer , Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( countA . containsKey ( a [ i ] ) ) countA . put ( a [ i ] , countA . get ( a [ i ] ) + 1 ) ; else countA . put ( a [ i ] , 1 ) ; } for ( int i = 0 ; i < m ; i ++ ) { if ( countB . containsKey ( b [ i ] ) ) countB . put ( b [ i ] , countB . get ( b [ i ] ) + 1 ) ; else countB . put ( b [ i ] , 1 ) ; } int res = 0 ; Set < Integer > s = countA . keySet ( ) ; for ( int x : s ) if ( countB . containsKey ( x ) ) res += Math . min ( countB . get ( x ) , countA . get ( x ) ) ; return res ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) arguments: (argument_list)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_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 (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal))))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (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 (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal))))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (decimal_integer_literal))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (enhanced_for_statement type: (integral_type) name: (identifier) value: (identifier) body: (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))))) (return_statement (identifier))))