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Analyze:
- trungntbk October 11, 2014- Count the number of elements in the List.
- Keep left_index and right_index to check whether the List is a palindrome. Initialize left_index = 1 (the 1st element in the List) and right_index = the number of elements in the list or the last element in the list.
- In each iteration, increase left_index by one, and decrease right_index by one until left_index >= right_index.
This algorithm uses space O(1).