Leetcode 260 Single Number III
Given an array of numbers nums
, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements that appear only once.
For example:
Given nums = [1, 2, 1, 3, 2, 5]
, return [3, 5]
.
Note:
- The order of the result is not important. So in the above example,
[5, 3]
is also correct. - Your algorithm should run in linear runtime complexity. Could you implement it using only constant space complexity?
class Solution(object): def singleNumber(self, nums): a, b, d = 0, 0, 0 for x in nums: d ^= x d &= -d for x in nums: if x & d: a ^= x else: b ^= x return [a,b]