**Question 1:**\nA perfect square is a number made by squaring a whole number.\n\nSome examples include 1, 4, 9, or 16, and so on -- because they are the squared results of 1, 2, 3, 4, etc. However, 15 is not a perfect square, because the square root of 15 is not a whole or natural number.\n\nGiven some positive integer `n`, write a method to return the sum of all perfect squares less than `n`.\n\n**Example 1:**\n```\nInput: n = 10\nOutput: 14\nExplanation: 1 + 4 + 9 = 14\n```\n\n**Question 2:**\nhttps://leetcode.com/problems/missing-ranges/ (premium)

Question 1:\nA perfect square is a number made by squaring a whole number.\n\nSome examples include 1, 4, 9, or 16, and so on -- because they are the squared re