## Problem Statement

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, 4]
Output: false  
Explanation: There are no duplicates in the given array.
``` 

**Example 2**:  
```
Input: nums= [1, 2, 3, 1]
Output: true  
Explanation: '1' is repeating.
```

**Constraints:**

- 1 <= nums.length <= $10^5$
- $-10^9$ <= nums[i] <= $10^9$

## Try it yourself
Try solving this question here:

**For a detailed solution, see the next chapter.**

## Problem Statement

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, 4]
Output: false  
Explanation: There are no duplicates in the given array.
``` 

**Example 2**:  
```
Input: nums= [1, 2, 3, 1]
Output: true  
Explanation: '1' is repeating.
```

## Try it yourself
Try solving this question here: