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Lessons Learned: HashMaps
Apr 23Share
Question: Invert a binary tree. Input: 4 / \ 2 7 / \ / \ 1 3 6 9 Output: 4 / \ 7 2 / \ / \ 9 6 3 1 Solution Approach 1: Recursive The inverse of an emp…
Apr 14Share
Alice and Bob take turns playing a game, with Alice starting first. Initially, there is a number N on the chalkboard. On each player's turn, that playe…
Apr 7Share
Question: Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. Solution Approach 1: Hash Table W…
Mar 31Share
Given an array A of integers, for each integer A[i] we may choose any x with -K <= x <= K, and add x to A[i]. After this process, we have some array B.…
Mar 24Share
Lessons Learned: TreeSet, Array Manipulation
Mar 7Share
Question: Implement an algorithm to print all valid (properly opened and closed) combinations of n pairs of parentheses. 
Feb 28Share
Lessons Learned: Array parsing
Feb 21Share
The problem: Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end.
Feb 14Share
Lessons learned: DFS
Feb 4Share
Question: Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary wo…
Jan 27Share
👋 Hello! I’m gathering feedback on SWE Prep. If you like to provide suggestions or feedback, let us know on this survey here! Question: Given a string…
Jan 22Share
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