static int number_of_tower ( int house [ ] , int range , int n ) {
  Arrays . sort ( house ) ;
  int numOfTower = 0 ;
  int i = 0 ;
  while ( i < n ) {
    numOfTower ++ ;
    int loc = house [ i ] + range ;
    while ( i < n && house [ i ] <= loc ) i ++ ;
    -- i ;
    loc = house [ i ] + range ;
    while ( i < n && house [ i ] <= loc ) i ++ ;
  }
  return numOfTower ;
}

static int number_of_tower ( int house [ ] , int range , int n ) { Arrays . sort ( house ) ; int numOfTower = 0 ; int i = 0 ; while ( i < n ) { numOfTower ++ ; int loc = house [ i ] + range ; while ( i < n && house [ i ] <= loc ) i ++ ; -- i ; loc = house [ i ] + range ; while ( i < n && house [ i ] <= loc ) i ++ ; } return numOfTower ; }
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