02-16 LeetCode 1780. Check if Number is a Sum of Powers of Three 3 Solutions: Tricky, Recursion and Base 3 Convertion
01-20 LeetCode 171. Excel Sheet Column Number 2 Approaches: Base Conversion from High to Low and from Low to High
01-08 LeetCode 69. Sqrt(x) 4 Approaches for Finding the Square Root of A Number: Brute Force, Exponent, Binary Search and the Newton Iteration Method