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How to decode Roman numbers · Problem statement Roman numerals are represented by seven symbols: I, V, X, L, C, D, and M. Symbol Value I ...

The math behind the coding challenge · Problem statement Given an integer n, return the least number of perfect square numbers that sum to n. A perfect...

Introduction to a mathematical Permutation · Problem statement You are given an integer array nums of length n where nums is a permutation of the numbers...

How to identify if an integer is a power of three · Problem statement Given an integer n, return true if it is a power of three. Otherwise, return...

Bit manipulation, mathematics and recursion · Problem statement Given an integer n, return the decimal value of the binary string formed by concatenating...

The math behind the problem · Problem statement Given an integer n, return the number of strings of length n that consist only of vowels (a, e, i, o, u)...