easy Bit Manipulation
Single Number
Every element in `nums` appears exactly twice except for one. Return that single element. (Hint: XOR cancels equal pairs.) Example: [4, 1, 2, 1, 2] → 4.
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Every element in `nums` appears exactly twice except for one. Return that single element. (Hint: XOR cancels equal pairs.) Example: [4, 1, 2, 1, 2] → 4.