Single Number
Explore how to identify the single number in an integer array where every other element appears twice. Learn to apply bitwise operations for a solution that runs in linear time and uses constant space, enhancing your coding interview problem-solving skills.
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Statement
Given an array of integers, where every element appears twice except for one, find the element that occurs only once.
Note: The solution must have linear runtime and constant space complexity.
Constraints:
-
nums.length -
nums[i]
Example
Understand the problem
Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:
Single Number
From the given array of integers, find the number that appears once.
array = [1, 2, 4, 1, 2, 4, 9, 6, 7, 6, 7]
1
2
9
6
Figure it out!
We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.
Try it yourself
Implement your solution in the following coding playground:
def single_number(nums):# Replace this placeholder return statement with your codereturn -1