Number of Distinct Averages

export function distinctAverages(nums: number[]): number {
  const n = nums.length;
  nums.sort((a, b) => a - b);
 
  const averages = new Set();
  let [start, end] = [0, n - 1];
  while (start < end) {
    averages.add((nums[start] + nums[end]) / 2);
    start += 1;
    end -= 1;
  }
  return averages.size;
}