C++ Coding Exercise – How to Merge Two Binary Trees?
Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are …
Category: algorithms
C++ Coding Exercise – Find Letter Case Permutation with DFS
Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible strings we could create. …
Algorithms to Find Maximum Depth of N-ary Tree (C++)
Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf …
C++ Coding Exercise – Find Third Maximum in O(n)
Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time complexity must be in …
C++ Coding Exercise – Sum of Left Leaves (BFS + DFS + Recursion)
Find the sum of all left leaves in a given binary tree. There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24. …