How to Invert a Binary Tree in C/C++?
This problem was inspired by this original tweet by Max Howell: Google: 90% of our engineers use the software you wrote (Homebrew), but you can’t invert a binary tree …
Author: ACMer
C++ Coding Exercise – Self Crossing
You are given an array x of n positive numbers. You start at point (0,0) and moves x metres to the north, then x metres to the west, x …
C++ Coding Exercise – Palindrome Pairs
This is classified as a hard puzzle: https://leetcode.com/problems/palindrome-pairs/ A palindrome string is a string whose reverse string is exactly the same, e.g. ABBA, 1, UIU… Brute Force Almost every …
SQL Coding Exercise – Find Department Highest Salary
Submit your solution: https://leetcode.com/problems/department-highest-salary/ As seen, two tables, you are asked to list the highest salary for each department and the employee name. However, if there are two or …
Counting Number of Set Bits for N Integers using Dynamic Programming Algorithm in Linear Time
Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’s in their binary representation and …