Category: Combinatoric Mathematics

Teaching Kids Programming: Videos on Data Structures and Algorithms Previously, we know there are 45 continuously increasing digits (each digit is 1 plus its previous digit) such as 12, …

Teaching Kids Programming: Videos on Data Structures and Algorithms Given N numbers, we know the total number of permutation is N! (factorial). If every number is not in its …

Teaching Kids Programming: Videos on Data Structures and Algorithms Given a grid with n*m squares (m horizontal squares and n vertical squares), and suppose you are at the top-left …

Teaching Kids Programming: Videos on Data Structures and Algorithms Permutation and Combination are the math concepts to count. Given N items, if we want to choose M items (M …

You are given a list of integers nums. Return the number of pairs i < j such that nums = nums. Constraints 0 ≤ n ≤ 100,000 where n …