PROBLEM STATEMENT
In biology, organisms have the following property: Starting from the first cell (the zygote), each 
cell during an organism's development process either divides into 2 other cells or does not divide 
at all.  An organism is mature when all of its cells will not divide any further.

Let's assign a unique number to each cell in an organism's development process.  For example, 
consider a species in which each organism starts with cell 0, which divides into cells 1 and 2.  
Cell 1 divides into cells 3 and 4.  Cells 2, 3 and 4 do not divide.  Every mature organism of this 
species will consist of exactly 3 cells - 2, 3 and 4.


During the development process, if we kill a cell, it will be absent in the mature form of the 
organism.  If that cell happens to be a cell that divides, then the mature organism will be 
missing all of the cell's descendants as well because the cell is killed before it has a chance to 
divide.  For example, in the organism described above, if we kill cell 1 during the development 
process, the mature organism will contain only cell 2.



You are given a vector <int> parentCell describing the development process of an organism.  The 
i-th element of parentCell is the parent cell of cell i (where i is a 0-based index).  The 
zygote's parent is -1.  Return the number of cells the mature form of this organism would have if 
you killed cell deletedCell during the development process.

DEFINITION
Class:CellRemoval
Method:cellsLeft
Parameters:vector <int>, int
Returns:int
Method signature:int cellsLeft(vector <int> parent, int deletedCell)


CONSTRAINTS
-parentCell will contain exactly N elements, where N is an odd integer between 1 and 50, inclusive.
-There will be exactly one "-1" element in parentCell.
-Every element of parentCell will be between -1 and N-1, inclusive.
-parentCell will form a binary tree.
-deletedCell will be between 0 and N-1, inclusive.


EXAMPLES

0)
{-1,0,0,1,1}
2

Returns: 2

This is the example organism from the problem statement.  If we kill cell 2, there will still be 
two cells left (3 and 4).

1)
{-1,0,0,1,1}
1

Returns: 1

This is the example organism from the problem statement.  If we kill cell 1, the only cell left 
will be cell 2.  Cells 3 and 4 will not exist because cell 1 is their ancestor.

2)
{-1,0,0,1,1}
0

Returns: 0

If we kill the zygote, there is nothing left.

3)
{-1,0,0,2,2,4,4,6,6}
4

Returns: 2



4)
{26,2,32,36,40,19,43,24,30,13,21,14,24,21,19,4,30,10,44,12,7,32,17,43,
 35,18,7,36,10,16,5,38,35,4,13,-1,16,26,1,12,2,5,18,40,1,17,38,44,14}
24

Returns: 14



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