Category: data structure

There is a special keyboard with all keys in a single row. Given a string keyboard of length 26 indicating the layout of the keyboard (indexed from 0 to …

In order to define a N-ary tree, we need to be able to store the Node value and its children – which is a list of the Node. And …

Teaching Kids Programming: Videos on Data Structures and Algorithms Given a directed graph represented as an adjacency list, return its reverse so if an edge goes from A to …

Teaching Kids Programming: Videos on Data Structures and Algorithms Given an array of integers nums and an integer target, return indices of the two numbers such that they add …

Teaching Kids Programming: Videos on Data Structures and Algorithms Trie (we pronounce “try”) or prefix tree is a tree data structure used to retrieve a key in a strings …