1486. XOR Operation in an Array-数组异或操作

Given an integer n and an integer start.

Define an array nums where nums[i] = start + 2*i (0-indexed) and n == nums.length.

Return the bitwise XOR of all elements of nums.

Example 1:
Input: n = 5, start = 0
Output: 8
Explanation: Array nums is equal to [0, 2, 4, 6, 8] where (0 ^ 2 ^ 4 ^ 6 ^ 8) = 8.
Where "^" corresponds to bitwise XOR operator.

Example 2:
Input: n = 4, start = 3
Output: 8
Explanation: Array nums is equal to [3, 5, 7, 9] where (3 ^ 5 ^ 7 ^ 9) = 8.

Example 3:
Input: n = 1, start = 7
Output: 7

Example 4:
Input: n = 10, start = 5
Output: 2 

Constraints:

• 1 <= n <= 1000
• 0 <= start <= 1000
• n == nums.length

Solution in python:

class Solution:
    def xorOperation(self, n: int, start: int) -> int:
        result = start
        for i in range(1, n):
            result ^= start + 2*i
        return result