29 lines
632 B
Markdown
29 lines
632 B
Markdown
Given a **non-empty** array of integers `nums`, every element appears _twice_ except for one. Find that single one.
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You must implement a solution with a linear runtime complexity and use only constant extra space.
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**Example 1:**
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Input: nums = [2,2,1]
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Output: 1
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**Example 2:**
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Input: nums = [4,1,2,1,2]
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Output: 4
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**Example 3:**
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Input: nums = [1]
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Output: 1
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**Constraints:**
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* `1 <= nums.length <= 3 * 104`
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* `-3 * 104 <= nums[i] <= 3 * 104`
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* Each element in the array appears twice except for one element which appears only once.
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https://leetcode.com/problems/single-number/ |