public static int collectKWood ( int n , int k ) {
  Arrays . sort ( height ) ;
  int low = 0 , high = height [ n - 1 ] ;
  while ( low <= high ) {
    int mid = low + ( ( high - low ) / 2 ) ;
    int collected = woodCollected ( n , mid ) ;
    if ( collected == k ) return mid ;
    if ( collected > k ) low = mid + 1 ;
    else high = mid - 1 ;
  }
  return - 1 ;
}

public static int collectKWood ( int n , int k ) { Arrays . sort ( height ) ; int low = 0 , high = height [ n - 1 ] ; while ( low <= high ) { int mid = low + ( ( high - low ) / 2 ) ; int collected = woodCollected ( n , mid ) ; if ( collected == k ) return mid ; if ( collected > k ) low = mid + 1 ; else high = mid - 1 ; } return - 1 ; }
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