public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = sc . nextInt ( ) ;
    int k = sc . nextInt ( ) ;
    List < Integer > l1 = new ArrayList < > ( ) ;
    List < Integer > l2 = new ArrayList < > ( ) ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) l1 . add ( sc . nextInt ( ) ) ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) l2 . add ( sc . nextInt ( ) ) ;
    for ( int i = 0 ;
    i < k ;
    i ++ ) {
      int minIndex = l1 . indexOf ( Collections . min ( l1 ) ) ;
      int maxIndex = l2 . indexOf ( Collections . max ( l2 ) ) ;
      int min = l1 . get ( minIndex ) ;
      int max = Collections . max ( l2 ) ;
      if ( max > min ) {
        l1 . remove ( minIndex ) ;
        l1 . add ( max ) ;
        l2 . remove ( maxIndex ) ;
      }
    }
    int sum = 0 ;
    for ( int i = 0 ;
    i < l1 . size ( ) ;
    i ++ ) sum = sum + l1 . get ( i ) ;
    System . out . println ( sum ) ;
  }
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; while ( t -- > 0 ) { int n = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; List < Integer > l1 = new ArrayList < > ( ) ; List < Integer > l2 = new ArrayList < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) l1 . add ( sc . nextInt ( ) ) ; for ( int i = 0 ; i < n ; i ++ ) l2 . add ( sc . nextInt ( ) ) ; for ( int i = 0 ; i < k ; i ++ ) { int minIndex = l1 . indexOf ( Collections . min ( l1 ) ) ; int maxIndex = l2 . indexOf ( Collections . max ( l2 ) ) ; int min = l1 . get ( minIndex ) ; int max = Collections . max ( l2 ) ; if ( max > min ) { l1 . remove ( minIndex ) ; l1 . add ( max ) ; l2 . remove ( maxIndex ) ; } } int sum = 0 ; for ( int i = 0 ; i < l1 . size ( ) ; i ++ ) sum = sum + l1 . get ( i ) ; System . out . println ( sum ) ; } }
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(local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list 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