Question: In an array of integers, all elements appear even times except one appears odd times. Find that element. Please give an O(n)-time algorithm. For example:

In an array of integers, all elements appear even times except one appears odd times. Find that element. Please give an O(n)-time algorithm. For example: input array: [1,2,3,3,2,1,1,1,2], should output 2

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