#2177 - Find Three Consecutive Integers That Sum to a Given Number

Medium • View on LeetCode • View on GitHub

Problem Description

Given an integer num, return three consecutive integers (as a sorted array) that sum to num.

If num cannot be expressed as the sum of three consecutive integers, return an empty array.

Solution

/**
 * @param {number} num
 * @return {number[]}
 */
var sumOfThree = function(num) {
  if (num % 3 !== 0) return [];

  const middle = num / 3;
  return [middle - 1, middle, middle + 1];
};