47. XOR Trick

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Input: nums = [2, 2, 1]

Output: 1

Explanation: 2 XOR 2 equals 0, then 0 XOR 1 equals 1.

Input: nums = [4, 1, 2, 1, 2]

Output: 4

Explanation: 4 XOR 1 XOR 2 XOR 1 XOR 2 equals 4.

Input: nums = [1]

Output: 1

Explanation: The single element is 1.

Time Complexity

O(n)

Space Complexity

O(1)