Number of Arithmetic Triplets

In this lab, you will implement a function arithmeticTriplets(nums: number[], diff: number): number that returns the number of unique arithmetic triplets. Your input will be a 0-indexed, strictly increasing integer array nums and a positive integer diff. A triplet (i, j, k) is an arithmetic triplet if the following conditions are met:

• i < j < k
• nums[j] - nums[i] == diff
• nums[k] - nums[j] == diff

Your task is to return the number of unique arithmetic triplets.

Example:

arithmeticTriplets([0,1,4,6,7,10], 3)
// Output: 2
// Explanation: (1, 2, 4) and (2, 4, 5) are arithmetic triplets.

arithmeticTriplets([4,5,6,7,8,9], 2)
// Output: 2
// Explanation: (0, 2, 4) and (1, 3, 5) are arithmetic triplets.

Constraints:

• 3 <= nums.length <= 200
• 0 <= nums[i] <= 200
• 1 <= diff <= 50
• nums is strictly increasing.

To help you get started with this lab, the initial file system for the user has been provided below. Make sure to export the function arithmeticTriplets.

/**
 * @param {number[]} nums
 * @param {number} diff
 * @return {number}
 */
export const arithmeticTriplets = function(nums, diff) {
    
};

{
    "name": "codedamn-lab",
    "type": "module"
}

tabs: ['index.js']
terminals: ['yarn install']