402382: GYM100741 D Xor Sum
Memory Limit：4 MB
Time Limit：1 S
Judge Style：Text Compare
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Description
D. Xor Sumtime limit per test1 secondmemory limit per test4 megabytesinputstandard inputoutputstandard output
You're given an array a with n elements.
Compute the xor sum of the elements that appear an odd number of times in the array a.
InputThe first line contains number n (1 ≤ n ≤ 3000000). The second line of the input contains n numbers, representing the array a. All elements of a are between 0 and 109
OutputThe only line of the output contains the answer of the problem.
ExamplesInput5Output
4 4 3 3 4
4