I think ,Gunjan's solution is right.
suppose {1,2,1,3,2} is given,
1 --- 01
2 ---- 10
3 ----- 11
..
..
..
So XOR these elements 01 XOR 10 -------> 11
11 XOR 01 -------> 10
10 XOR 11 -------> 01
01 XOR 10 -------> 11(3)
So answer is 3.
Any query???????????????
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