# Contains Duplicate II Lab

In this lab, you will implement the `Contains Duplicate II`

function. This function receives an integer array `nums`

and an integer `k`

and returns `true`

if there are two **distinct indices** `i`

and `j`

in the array such that `nums[i] == nums[j]`

and `abs(i - j) <= k`

. Otherwise, it returns `false`

. You can use ESM import/export everywhere.

## Problem Description

Given an integer array `nums`

and an integer `k`

, return `true`

if there are two **distinct indices** `i`

and `j`

in the array such that `nums[i] == nums[j]`

and `abs(i - j) <= k`

.

### Examples

**Example 1:**

**Input:** nums = [1, 2, 3, 1], k = 3
**Output:** true

In this example, the integer array `nums`

contains two 1s with indices 0 and 3, meaning `abs(0 - 3) = 3`

. Since 3 is less than or equal to the given integer `k`

, which is also 3, the function returns `true`

.

**Example 2:**

**Input:** nums = [1, 0, 1, 1], k = 1
**Output:** true

In this example, the integer array `nums`

contains three 1s with indices 0, 2, and 3. The function returns `true`

since `abs(2 - 3) = 1`

, which is less than or equal to the given integer `k`

, which is 1.

**Example 3:**

**Input:** nums = [1, 2, 3, 1, 2, 3], k = 2
**Output:** false

In this example, no pair of equal numbers satisfy the condition `abs(i - j) <= k`

. Therefore, the function returns `false`

.

### Constraints

`1 <= nums.length <= 105`

`-109 <= nums[i] <= 109`

`0 <= k <= 105`

## Challenges

- Implement the
`containsNearbyDuplicate`

function that takes an integer array`nums`

and an integer`k`

as input and returns a boolean as output. - Export the
`containsNearbyDuplicate`

function so that it can be imported in the evaluation script.