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g0201_0300.s0217_contains_duplicate.readme.md Maven / Gradle / Ivy

217\. Contains Duplicate

Easy

Given an integer array `nums`, return `true` if any value appears **at least twice** in the array, and return `false` if every element is distinct.

**Example 1:**

**Input:** nums = [1,2,3,1]

**Output:** true 

**Example 2:**

**Input:** nums = [1,2,3,4]

**Output:** false 

**Example 3:**

**Input:** nums = [1,1,1,3,3,4,3,2,4,2]

**Output:** true 

**Constraints:**

*   1 <= nums.length <= 105
*   -109 <= nums[i] <= 109