public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    int a = sc . nextInt ( ) ;
    int k = sc . nextInt ( ) ;
    int arra [ ] = new int [ a ] ;
    int arrb [ ] = new int [ a ] ;
    for ( int i = 0 ;
    i < a ;
    i ++ ) {
      arra [ i ] = sc . nextInt ( ) ;
    }
    for ( int i = 0 ;
    i < a ;
    i ++ ) {
      arrb [ i ] = sc . nextInt ( ) ;
    }
    Arrays . sort ( arra ) ;
    Arrays . sort ( arrb ) ;
    int sum = 0 ;
    int pointb = a - 1 ;
    for ( int i = 0 ;
    i < a ;
    i ++ ) {
      if ( k > 0 & arra [ i ] < arrb [ pointb ] ) {
        k -- ;
        sum += arrb [ pointb ] ;
        pointb -- ;
      }
      else {
        sum += arra [ 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 a = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; int arra [ ] = new int [ a ] ; int arrb [ ] = new int [ a ] ; for ( int i = 0 ; i < a ; i ++ ) { arra [ i ] = sc . nextInt ( ) ; } for ( int i = 0 ; i < a ; i ++ ) { arrb [ i ] = sc . nextInt ( ) ; } Arrays . sort ( arra ) ; Arrays . sort ( arrb ) ; int sum = 0 ; int pointb = a - 1 ; for ( int i = 0 ; i < a ; i ++ ) { if ( k > 0 & arra [ i ] < arrb [ pointb ] ) { k -- ; sum += arrb [ pointb ] ; pointb -- ; } else { sum += arra [ i ] ; } } System . out . println ( sum ) ; } }
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