Table of Contents
一、中文版
给你两个整数,n 和 start 。
数组 nums 定义为:nums[i] = start + 2*i(下标从 0 开始)且 n == nums.length 。
请返回 nums 中所有元素按位异或(XOR)后得到的结果。
示例 1:
输入: n = 5, start = 0
输出: 8
解释: 数组 nums 为 [0, 2, 4, 6, 8],其中 (0 ^ 2 ^ 4 ^ 6 ^ 8) = 8 。
"^" 为按位异或 XOR 运算符。
示例 2:
输入: n = 4, start = 3
输出: 8
解释: 数组 nums 为 [3, 5, 7, 9],其中 (3 ^ 5 ^ 7 ^ 9) = 8.
示例 3:
输入: n = 1, start = 7
输出: 7
示例 4:
输入: n = 10, start = 5
输出: 2
提示:
1 <= n <= 10000 <= start <= 1000n == nums.length
二、英文版
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 <= 10000 <= start <= 1000n == nums.length
三、My answer
class Solution:
def xorOperation(self, n: int, start: int) -> int:
nums = [0] * n
for i in range(n):
nums[i] = start + 2*i
# print(nums)
res = nums[0]
for i in range(1,n):
res = res ^ nums[i]
return res
四、解题报告
直接遍历解法