LeetCode for beginners!

LeetCode for beginners! Hash Maps vs. Arrays! (save this for later!) (from a software engineer) swipe @that_swe_intern All content is for educational purposes Google Microsoft amazon So, you want a $200k+ software job from these guys ^ But you don't know when to use Hash Maps vs Arrays. Here's my full 4 year degree In just 3 slides! swipe @that_swe_intern All content is for educational purposes 1) Key-Value Pairs Winner: Hash Maps! HashMaps can instantly lookup pairs of values in O(1) time! A common example: HHHH Storing counts of each letter! word = "banana" counts = { (b -> 1), (a -> 3), (n -> 2), } Good JOB Simple, right? Let's go on. swipe @that_swe_intern All content is for educational purposes 2) Ordered Data Winner: Arrays! Use Arrays when order matters! Indices will instantly get values. A common example: $ $ Storing stock prices over time! prices = [ 2 | 8 | 9 | 4 | 5 ] ↑ prices[0] is the stock price on the 0th day! GREAT WORK Simple, right? Let's go on. swipe @that_swe_intern All content is for educational purposes 3) More examples! Problem: Sorting data. Check if we hold a certain value. Traverse using pointers. Preventing duplicate values. Insert/delete at ends. Storing key-value pairs. @that_swe_intern All content is for educational purposes Solution: Array Hash Map Array Hash Map Array Hash Map Good JOB swipe Congrats! You know when to use Hash Maps vs Arrays! You're on your way to a job with: 1. Great Pay 2. Work-Life Balance 3. Interesting Problems Keep it up! Follow to commit to your goal of breaking into tech!