Valid Anagram — Sorting, HashMap Counting, and the 26-Slot Array Optimisation
Two Sum traded space for time with a HashMap. Buy & Sell Stock tracked a running minimum. Valid Anagram teaches the third must-know pattern: counting....
Articles in DSA for Android
Best Time to Buy and Sell Stock — Brute Force, Single-Pass Insight, and the Interview Script
Two Sum taught us to trade space for time with a HashMap. This problem teaches the opposite — sometimes you just remember the right one thing as you w...
Two Sum — The Complete Interview Walkthrough (Brute Force, HashMap, and the Conversation an Interviewer Wants to Hear)
If you're an Android dev prepping for interviews, the first DSA round usually starts with one problem: Two Sum. It's the warm-up every interviewer rea...
