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Find The Missing Duplicate in a Given Array.
Objective:  Given an Integer array. Array contains duplicates of all the numbers in array except one number . Find that number.
Example :
int [] A = { 2,1,3,5,5,3,2,1,6,7,7,8,8}; Output : Missing duplicate is 6
Appraoch:
 Naive solution is use Hash Table ..space complexity  O(n)
 Better solution  XOR
 A^A = 0 and A^B^A = B, so if we XOR all the elements, the answer will be the missing no
 If we have only one element, the missing no will be that no
Code:
Output:
Missing duplicate is 6
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