How to Find Positions of Large Groups using Two Pointer Algorithm?
In a string S of lowercase letters, these letters form consecutive groups of the same character. For example, a string like S = “abbxxxxzyy” has the groups “a”, “bb”, …
Category: coding exercise
How to Sum the Root To Leaf in Binary Numbers in a Binary Tree using Breadth First Search?
Given a binary tree, each node has value 0 or 1. Each root-to-leaf path represents a binary number starting with the most significant bit. For example, if the path …
How to Check If Two Strings are Buddy Strings?
Given two strings A and B of lowercase letters, return true if and only if we can swap two letters in A so that the result equals B. Example …
How to Validate a Perfect Number (Integer)?
We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself. Now, given an integer n, write a …
How to Uncommon Words from Two Sentences in Java?
We are given two sentences A and B. (A sentence is a string of space separated words. Each word consists only of lowercase letters.) A word is uncommon if …