Given an array of positive integers. All numbers occur even number of times except one number which occurs odd number of times. Find the number in O(n) time & constant space.
Example:
I/P = [1, 2, 3, 2, 3, 1, 3]
O/P = 3
Algorithm:
Do bitwise XOR of all the elements. Finally we get the number which has odd occurrenc
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