Please guide me to solve this problem
Explain about the approach to solve the problem
- If we take XOR of zero and some number, it will return that number: a xor 0 = a
- If we take XOR of two same numbers, it will return 0: a xor a=0
- a xor b xor a = (a xor a) xor b = 0 xor b = b
So we can XOR all numbers together to find the unique number.
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