The Number That Appears Once
Beginner
Every value in nums appears exactly twice, except for one value that appears once. Return that value.
Examples
Example 1
Input:
single_number([4, 1, 2, 1, 2])
Output:
4
Example 2
Input:
single_number([7])
Output:
7
Constraints
1 <= len(nums) <= 2 * 10**5 + 1, and the length is odd0 <= nums[i] <= 10**5
Theory
Go to TheoryKeywords
dsa-sheetarraysarray-basics
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