In this video, we solve the classic Zero Sum Subarray problem using an efficient hash map (unordered_map / dictionary) approach. This is a common question in coding interviews and DSA practice that tests your understanding of prefix sums and hashing.
📌 What you’ll learn:
What is a zero sum subarray?
Intuition behind using prefix sum and hash map
Step-by-step explanation of the optimal solution
Dry run with example inputs
Time and space complexity breakdown
👨💻 Language used: C++
🧠 Ideal for students preparing for interviews, coding rounds, or mastering problems on arrays and hashing.
💬 Drop your thoughts or alternate methods in the comments — I respond to everyone!
#zerosumsubarray #hashmap #prefixsum #dsa #arrayproblems #interviewprep #csestudent #leetcode
