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【leetcode】1486. XOR Operation in an Array

时间:2020-06-22 15:49:58      阅读:98      评论:0      收藏:0      [点我收藏+]

标签:ret   turn   res   span   bsp   constrain   integer   length   The   

题目如下:

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

解题思路:很简单的题目,依次做XOR操作就好了。

代码如下:

class Solution(object):
    def xorOperation(self, n, start):
        """
        :type n: int
        :type start: int
        :rtype: int
        """
        res = start
        i = 1
        while i < n:
            res ^= (start + 2*i)
            i += 1
        return res

 

【leetcode】1486. XOR Operation in an Array

标签:ret   turn   res   span   bsp   constrain   integer   length   The   

原文地址:https://www.cnblogs.com/seyjs/p/13176660.html

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