static int countPoints ( int n , int m , int a [ ] , int [ ] b , int x , int y ) {
  Arrays . sort ( a ) ;
  Arrays . sort ( b ) ;
  int j = 0 ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    while ( j < m ) {
      if ( a [ i ] + y < b [ j ] ) break ;
      if ( b [ j ] >= a [ i ] - x && b [ j ] <= a [ i ] + y ) {
        count ++ ;
        j ++ ;
        break ;
      }
      else j ++ ;
    }
  }
  return count ;
}

static int countPoints ( int n , int m , int a [ ] , int [ ] b , int x , int y ) { Arrays . sort ( a ) ; Arrays . sort ( b ) ; int j = 0 ; int count = 0 ; for ( int i = 0 ; i < n ; i ++ ) { while ( j < m ) { if ( a [ i ] + y < b [ j ] ) break ; if ( b [ j ] >= a [ i ] - x && b [ j ] <= a [ i ] + y ) { count ++ ; j ++ ; break ; } else j ++ ; } } return count ; }
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