314. The Single Number
EasyXOR
Every value appears twice except one, which appears once. Print it, using O(1) extra memory.
Input format
Line 1: n Line 2: n integers
Output format
The single value.
Example 1
Input
3 2 2 1
Output
1
Example 2
Input
5 4 1 2 1 2
Output
4
Constraints
1 ≤ n ≤ 10⁵ (n odd)
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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