Tag: hash map

Teaching Kids Programming: Videos on Data Structures and Algorithms Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the …

Teaching Kids Programming: Videos on Data Structures and Algorithms Given a string s, return the length of the longest substring between two equal characters, excluding the two characters. If …

Teaching Kids Programming: Videos on Data Structures and Algorithms Given a string s, return the number of unique palindromes of length three that are a subsequence of s. Note …

Teaching Kids Programming: Videos on Data Structures and Algorithms Given an integer num, return the number of digits in num that divide num. An integer val divides nums if …

Teaching Kids Programming: Videos on Data Structures and Algorithms You are given a string moves of length n consisting only of characters ‘L’, ‘R’, and ‘_’. The string represents …