Logical puzzles to be solved with use of Data structures. 

Q. To find a non-duplicate number in an array of unknown size with each number having its duplicate except one.

S. XOR all numbers, in the end we are left with the non-duplicate 



Q. find the middle element of the linked list of unknown size.

S. Take two pointers. one traverses one step at a time and second traversing 2 steps at a tym.



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