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g0101_0200.s0136_single_number.readme.md Maven / Gradle / Ivy

136\. Single Number

Easy

Given a **non-empty** array of integers `nums`, every element appears _twice_ except for one. Find that single one.

You must implement a solution with a linear runtime complexity and use only constant extra space.

**Example 1:**

**Input:** nums = [2,2,1]

**Output:** 1 

**Example 2:**

**Input:** nums = [4,1,2,1,2]

**Output:** 4 

**Example 3:**

**Input:** nums = [1]

**Output:** 1 

**Constraints:**

*   1 <= nums.length <= 3 * 104
*   -3 * 104 <= nums[i] <= 3 * 104
*   Each element in the array appears twice except for one element which appears only once.