static int countPairs ( int [ ] arr ) {
  int n = arr . length ;
  int max = maxPairSum ( arr ) ;
  List < Integer > perfectcubes = getPerfectcubes ( max ) ;
  List < Integer > nums = new ArrayList < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    nums . add ( arr [ i ] ) ;
  }
  int count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    count += countPairsWith ( arr [ i ] , perfectcubes , nums ) ;
  }
  return count ;
}

static int countPairs ( int [ ] arr ) { int n = arr . length ; int max = maxPairSum ( arr ) ; List < Integer > perfectcubes = getPerfectcubes ( max ) ; List < Integer > nums = new ArrayList < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { nums . add ( arr [ i ] ) ; } int count = 0 ; for ( int i = 0 ; i < n ; i ++ ) { count += countPairsWith ( arr [ i ] , perfectcubes , nums ) ; } return count ; }
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