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Invert Binary Tree
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…
Sameer Khoja
Apr 14
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Divisor Game
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…
Sameer Khoja
Apr 7
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Single Number
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…
Sameer Khoja
Mar 31
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Smallest Range
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.…
Sameer Khoja
Mar 24
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Find the Distance Value Between Two Arrays
Lessons Learned: TreeSet, Array Manipulation
Sameer Khoja
Mar 7
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Valid Parentheses
Question: Implement an algorithm to print all valid (properly opened and closed) combinations of n pairs of parentheses.
Sameer Khoja
Feb 28
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Median of Two Sorted Arrays
Lessons Learned: Array parsing
Sameer Khoja
Feb 21
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Word Ladder
The problem: Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end.
Sameer Khoja
Feb 14
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Word Break II
Lessons learned: DFS
Sameer Khoja
Feb 4
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Word Break
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…
Sameer Khoja
Jan 27
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Longest Palindromic Substring
👋 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…
Sameer Khoja
Jan 22
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Rotate Array
Lesson: Array Manipulation
Sameer Khoja
Jan 14
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